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Diff of /pkg/R/Matrix.R

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revision 477, Wed Feb 2 14:14:59 2005 UTC revision 2110, Sat Jan 26 20:59:26 2008 UTC
# Line 1  Line 1 
1  setMethod("show", signature(object = "Matrix"),  #### Toplevel ``virtual'' class "Matrix"
2            function(object) print(as(object, "matrix")))  
3    
4    ### Virtual coercions -- via smart "helpers" (-> ./Auxiliaries.R)
5    
6    setAs("Matrix", "sparseMatrix", function(from) as(from, "CsparseMatrix"))
7    setAs("Matrix", "CsparseMatrix", function(from) as_Csparse(from))
8    setAs("Matrix", "denseMatrix",  function(from) as_dense(from))
9    
10    ## Maybe TODO:
11    ## setAs("Matrix", "nMatrix", function(from) ....)
12    
13    ## Most of these work; this is a last resort:
14    setAs(from = "Matrix", to = "matrix", # do *not* call base::as.matrix() here:
15          function(from) .bail.out.2("coerce", class(from), class(to)))
16    setAs(from = "matrix", to = "Matrix", function(from) Matrix(from))
17    
18    ## ## probably not needed eventually:
19    ## setAs(from = "ddenseMatrix", to = "matrix",
20    ##       function(from) {
21    ##        if(length(d <- dim(from)) != 2) stop("dim(.) has not length 2")
22    ##        array(from@x, dim = d, dimnames = dimnames(from))
23    ##       })
24    
25    ## should propagate to all subclasses:
26    setMethod("as.matrix", signature(x = "Matrix"), function(x) as(x, "matrix"))
27    ## for 'Matrix' objects, as.array() should be equivalent:
28    setMethod("as.array",  signature(x = "Matrix"), function(x) as(x, "matrix"))
29    
30    ## head and tail apply to all Matrix objects for which subscripting is allowed:
31    setMethod("head", signature(x = "Matrix"), utils::head.matrix)
32    setMethod("tail", signature(x = "Matrix"), utils::tail.matrix)
33    
34    setMethod("drop", signature(x = "Matrix"),
35              function(x) if(all(dim(x) != 1)) x else drop(as(x, "matrix")))
36    
37    ## slow "fall back" method {subclasses should have faster ones}:
38    setMethod("as.vector", signature(x = "Matrix", mode = "missing"),
39              function(x) as.vector(as(x, "matrix")))
40    
41    ## mainly need these for "dMatrix" or "lMatrix" respectively, but why not general:
42    setMethod("as.numeric", signature(x = "Matrix"),
43              function(x, ...) as.numeric(as.vector(x)))
44    setMethod("as.logical", signature(x = "Matrix"),
45              function(x, ...) as.logical(as.vector(x)))
46    
47    setMethod("cov2cor", signature(V = "Matrix"),
48              function(V) as(cov2cor(as(V, "matrix")), "dpoMatrix"))
49    
50    ## "base" has an isSymmetric() S3-generic since R 2.3.0
51    setMethod("isSymmetric", signature(object = "symmetricMatrix"),
52              function(object,tol) TRUE)
53    setMethod("isSymmetric", signature(object = "triangularMatrix"),
54              ## TRUE iff diagonal:
55              function(object,tol) isDiagonal(object))
56    
57    setMethod("isTriangular", signature(object = "triangularMatrix"),
58              function(object, ...) TRUE)
59    
60    setMethod("isTriangular", signature(object = "matrix"), isTriMat)
61    
62    setMethod("isDiagonal", signature(object = "matrix"), .is.diagonal)
63    
64    
65    
66    setMethod("dim", signature(x = "Matrix"),
67              function(x) x@Dim, valueClass = "integer")
68    
69    setMethod("length", "Matrix", function(x) prod(dim(x)))
70    
71    setMethod("dimnames", signature(x = "Matrix"), function(x) x@Dimnames)
72    
73    
74    ## not exported but used more than once for "dimnames<-" method :
75    ## -- or do only once for all "Matrix" classes ??
76    dimnamesGets <- function (x, value) {
77        d <- dim(x)
78        if (!is.list(value) || length(value) != 2 ||
79            !(is.null(v1 <- value[[1]]) || length(v1) == d[1]) ||
80            !(is.null(v2 <- value[[2]]) || length(v2) == d[2]))
81            stop(sprintf("invalid dimnames given for '%s' object", class(x)))
82        x@Dimnames <- list(if(!is.null(v1)) as.character(v1),
83                           if(!is.null(v2)) as.character(v2))
84        x
85    }
86    setMethod("dimnames<-", signature(x = "Matrix", value = "list"),
87              dimnamesGets)
88    
89    setMethod("unname", signature("Matrix", force="missing"),
90              function(obj) { obj@Dimnames <- list(NULL,NULL); obj})
91    
92    setMethod("all", signature(x = "Matrix"),
93              function(x, ..., na.rm)
94              callGeneric(as(x, "lMatrix"), ..., na.rm=na.rm))
95    
96    setMethod("any", signature(x = "Matrix"),
97              function(x, ..., na.rm)
98              callGeneric(as(x, "lMatrix"), ..., na.rm=na.rm))
99    
100    ## NOTE:  "&" and "|"  are now in group "Logic" c "Ops" --> ./Ops.R
101    ##        "!" is in ./not.R
102    
103    
104  Matrix <-  Matrix <-
105      function (data = NA, nrow = 1, ncol = 1, byrow = FALSE, dimnames = NULL)      function (data = NA, nrow = 1, ncol = 1, byrow = FALSE, dimnames = NULL,
106                  sparse = NULL, forceCheck = FALSE)
107  {  {
108      if (is(data, "Matrix")) return(data)      sparseDefault <- function(m) prod(dim(m)) > 2*sum(isN0(as(m, "matrix")))
109      if (is.matrix(data)) { val <- data }  
110      else {      i.M <- is(data, "Matrix")
111        if(!i.M && inherits(data, "table")) # special treatment
112            class(data) <- "matrix" # "matrix" first for S4 dispatch
113        if(is.null(sparse1 <- sparse) && (i.M || is(data, "matrix")))
114            sparse <- sparseDefault(data)
115    
116        doDN <- TRUE
117        if (i.M) {
118            if(!missing(nrow) || !missing(ncol)|| !missing(byrow))
119                warning("'nrow', 'ncol', etc, are disregarded when 'data' is \"Matrix\" already")
120            sM <- is(data,"sparseMatrix")
121            if(!forceCheck && ((sparse && sM) || (!sparse && !sM)))
122                return(data)
123            ## else : convert  dense <-> sparse -> at end
124        }
125        else if (!is.matrix(data)) { ## cut & paste from "base::matrix" :
126          if (missing(nrow))          if (missing(nrow))
127              nrow <- ceiling(length(data)/ncol)              nrow <- ceiling(length(data)/ncol)
128          else if (missing(ncol))          else if (missing(ncol))
129              ncol <- ceiling(length(data)/nrow)              ncol <- ceiling(length(data)/nrow)
130          val <- .Internal(matrix(data, nrow, ncol, byrow))          if(length(data) == 1 && is0(data) && !identical(sparse, FALSE)) {
131          dimnames(val) <- dimnames              ## Matrix(0, ...) : always sparse unless "sparse = FALSE":
132                if(is.null(sparse)) sparse1 <- sparse <- TRUE
133                i.M <- sM <- TRUE
134                ## will be sparse: do NOT construct full matrix!
135                data <- new(if(is.numeric(data)) "dgTMatrix" else
136                            if(is.logical(data)) "lgTMatrix" else
137                            stop("invalid 'data'"),
138                            Dim = as.integer(c(nrow,ncol)),
139                            Dimnames = if(is.null(dimnames)) list(NULL,NULL)
140                            else dimnames)
141            } else { ## normal case - using .Internal() to avoid more copying
142                if(getRversion() >= "2.7.0")
143                    data <- .Internal(matrix(data, nrow, ncol, byrow, dimnames))
144                else {
145                    data <- .Internal(matrix(data, nrow, ncol, byrow))
146                    dimnames(data) <- dimnames
147      }      }
148      as(val, "dgeMatrix")              if(is.null(sparse))
149                    sparse <- sparseDefault(data)
150  }  }
151            doDN <- FALSE
152        } else if(!missing(nrow) || !missing(ncol)|| !missing(byrow))
153            warning("'nrow', 'ncol', etc, are disregarded for matrix 'data'")
154    
155  Matrix.class <- function(x, tol = 0, symmetry = TRUE, unit.diagonal = TRUE,      ## 'data' is now a "matrix" or "Matrix"
156                           triangularity = c(TRUE, TRUE),      if (doDN && !is.null(dimnames))
157                           orthogonality = c(TRUE, TRUE), normality = c(TRUE, TRUE))          dimnames(data) <- dimnames
158  {  
159      val <- "Matrix"      ## check for symmetric / triangular / diagonal :
160      x <- as.matrix(x)      isSym <- isSymmetric(data)
161      if (symmetry) {      if((isTri <- !isSym))
162          if (is.Hermitian(x, tol)) val <- c("Hermitian", val)          isTri <- isTriangular(data)
163      }      isDiag <- isSym # cannot be diagonal if it isn't symmetric
164      if (triangularity[1]) {      if(isDiag)
165          if (is.LowerTriangular(x, tol)) {          isDiag <- isDiagonal(data)
166              val <- c("LowerTriangular", val)  
167              if (unit.diagonal)      ## Find proper matrix class 'cl'
168                  if (max(Mod(diag(x) - 1)) <= tol)      cl <-
169                      val <- c("UnitLowerTriangular", val)          if(isDiag && !isTRUE(sparse1))
170          }              "diagonalMatrix" # -> will automatically check for type
171      }          else {
172      if (triangularity[2]) {              ## consider it's type
173          if (is.UpperTriangular(x, tol)) {              ctype <-
174              val <- c("UpperTriangular", val)                  if(is(data,"Matrix")) class(data)
175              if (unit.diagonal)                  else {
176                  if (max(Mod(diag(x) - 1)) <= tol)                      if("complex" == (ctype <- typeof(data)))
177                      val <- c("UnitUpperTriangular", val)                          "z" else ctype
178          }                  }
179      }              ctype <- substr(ctype, 1,1) # "d", "l", "i" or "z"
180      if (orthogonality[1]) {              if(ctype == "z")
181          if (is.ColOrthonormal(x, tol)) {                  stop("complex matrices not yet implemented in Matrix package")
182              val <- c("ColOrthoNormal", "ColOrthogonal", val)              if(ctype == "i") {
183          } else {                  warning("integer matrices not yet implemented in 'Matrix'; ",
184              if (Orthogonal.test(x, normal = FALSE) <= tol)                          "using 'double' ones'")
185                  val <- c("ColOrthogonal", val)                  ctype <- "d"
186                }
187                paste(ctype,
188                      if(sparse) {
189                          if(isSym) "sCMatrix" else
190                          if(isTri) "tCMatrix" else "gCMatrix"
191                      } else { ## dense
192                          if(isSym) "syMatrix" else
193                          if(isTri) "trMatrix" else "geMatrix"
194                      }, sep="")
195            }
196    
197        ## Can we coerce and be done?
198        if(!canCoerce(data,cl)) { ## try to coerce ``via'' virtual classes
199            if(sparse && !sM)
200                data <- as(data, "sparseMatrix")
201            else if(!sparse && !is(data, "denseMatrix"))
202                data <- as(data, "denseMatrix")
203            if(isTri && !is(data, "triangularMatrix"))
204                data <- as(data, "triangularMatrix")
205            else if(isSym && !is(data, "symmetricMatrix"))
206                data <- as(data, "symmetricMatrix")
207          }          }
208        ## now coerce in any case .. maybe producing sensible error message:
209        as(data, cl)
210      }      }
211      if (orthogonality[2]) {  
212          if (normality[2] && is.RowOrthonormal(x, tol)) {  ## Methods for operations where one argument is numeric
213              val <- c("RowOrthoNormal", "RowOrthogonal", val)  
214    ## Using as.matrix() and rbind()
215    ## in order to get dimnames from names {at least potentially}:
216    
217    setMethod("%*%", signature(x = "Matrix", y = "numeric"),
218              function(x, y) callGeneric(x, as.matrix(y)))
219    setMethod("%*%", signature(x = "numeric", y = "Matrix"),
220              function(x, y) callGeneric(matrix(x, nrow = 1, byrow=TRUE), y))
221    
222    setMethod("%*%", signature(x = "Matrix", y = "matrix"),
223              function(x, y) callGeneric(x, Matrix(y)))
224    setMethod("%*%", signature(x = "matrix", y = "Matrix"),
225              function(x, y) callGeneric(Matrix(x), y))
226    
227    
228    setMethod("crossprod", signature(x = "Matrix", y = "numeric"),
229              function(x, y = NULL) callGeneric(x, as.matrix(y)))
230    setMethod("crossprod", signature(x = "numeric", y = "Matrix"),
231              function(x, y = NULL)  callGeneric(as.matrix(x), y))
232    
233    setMethod("crossprod", signature(x = "Matrix", y = "matrix"),
234              function(x, y = NULL) callGeneric(x, Matrix(y)))
235    setMethod("crossprod", signature(x = "matrix", y = "Matrix"),
236              function(x, y = NULL) callGeneric(Matrix(x), y))
237    
238    ## The as.matrix() promotion seems illogical to MM,
239    ## but is according to help(tcrossprod, package = "base") :
240    setMethod("tcrossprod", signature(x = "Matrix", y = "numeric"),
241              function(x, y = NULL) callGeneric(x, as.matrix(y)))
242    setMethod("tcrossprod", signature(x = "numeric", y = "Matrix"),
243              function(x, y = NULL)  callGeneric(as.matrix(x), y))
244    setMethod("tcrossprod", signature(x = "Matrix", y = "matrix"),
245              function(x, y = NULL) callGeneric(x, Matrix(y)))
246    setMethod("tcrossprod", signature(x = "matrix", y = "Matrix"),
247              function(x, y = NULL) callGeneric(Matrix(x), y))
248    
249    ## maybe not 100% optimal, but elegant:
250    setMethod("solve", signature(a = "Matrix", b = "missing"),
251              function(a, b, ...) solve(a, Diagonal(nrow(a))))
252    
253    setMethod("solve", signature(a = "Matrix", b = "numeric"),
254              function(a, b, ...) callGeneric(a, Matrix(b)))
255    setMethod("solve", signature(a = "Matrix", b = "matrix"),
256              function(a, b, ...) callGeneric(a, Matrix(b)))
257    setMethod("solve", signature(a = "matrix", b = "Matrix"),
258              function(a, b, ...) callGeneric(Matrix(a), b))
259    
260    ## when no sub-class method is found, bail out
261    setMethod("solve", signature(a = "Matrix", b = "Matrix"),
262              function(a, b, ...) .bail.out.2("solve", class(a), class(b)))
263    
264    ## bail-out methods in order to get better error messages
265    setMethod("%*%", signature(x = "Matrix", y = "Matrix"),
266              function (x, y)
267              stop(gettextf('not-yet-implemented method for <%s> %%*%% <%s>',
268                            class(x), class(y))))
269    
270    setMethod("crossprod", signature(x = "Matrix", y = "ANY"),
271              function (x, y = NULL) .bail.out.2(.Generic, class(x), class(y)))
272    setMethod("crossprod", signature(x = "ANY", y = "Matrix"),
273              function (x, y = NULL) .bail.out.2(.Generic, class(x), class(y)))
274    setMethod("tcrossprod", signature(x = "Matrix", y = "ANY"),
275              function (x, y = NULL) .bail.out.2(.Generic, class(x), class(y)))
276    setMethod("tcrossprod", signature(x = "ANY", y = "Matrix"),
277              function (x, y = NULL) .bail.out.2(.Generic, class(x), class(y)))
278    
279    ## cheap fallbacks
280    setMethod("crossprod", signature(x = "Matrix", y = "Matrix"),
281              function(x, y = NULL) t(x) %*% y)
282    setMethod("tcrossprod", signature(x = "Matrix", y = "Matrix"),
283              function(x, y = NULL) x %*% t(y))
284    
285    ## There are special sparse methods; this is a "fall back":
286    setMethod("kronecker", signature(X = "Matrix", Y = "ANY",
287                                     FUN = "ANY", make.dimnames = "ANY"),
288              function(X, Y, FUN, make.dimnames, ...) {
289                  if(is(X, "sparseMatrix"))
290                      warning("using slow kronecker() method")
291                  X <- as(X, "matrix") ; Matrix(callGeneric()) })
292    
293    setMethod("kronecker", signature(X = "ANY", Y = "Matrix",
294                                     FUN = "ANY", make.dimnames = "ANY"),
295              function(X, Y, FUN, make.dimnames, ...) {
296                  if(is(Y, "sparseMatrix"))
297                      warning("using slow kronecker() method")
298                  Y <- as(Y, "matrix") ; Matrix(callGeneric()) })
299    
300    
301    ## FIXME: All of these should never be called
302    setMethod("chol", signature(x = "Matrix"),
303              function(x, pivot = FALSE) .bail.out.1(.Generic, class(x)))
304    setMethod("determinant", signature(x = "Matrix"),
305              function(x, logarithm = TRUE) .bail.out.1(.Generic, class(x)))
306    
307    setMethod("diag", signature(x = "Matrix"),
308              function(x, nrow, ncol) .bail.out.1(.Generic, class(x)))
309    setMethod("t", signature(x = "Matrix"),
310              function(x) .bail.out.1(.Generic, class(x)))
311    
312    setMethod("norm", signature(x = "Matrix", type = "character"),
313              function(x, type, ...) .bail.out.1(.Generic, class(x)))
314    setMethod("rcond", signature(x = "Matrix", type = "character"),
315              function(x, type, ...) .bail.out.1(.Generic, class(x)))
316    
317    
318    ## for all :
319    setMethod("norm", signature(x = "ANY", type = "missing"),
320              function(x, type, ...) norm(x, type = "O", ...))
321    setMethod("rcond", signature(x = "ANY", type = "missing"),
322              function(x, type, ...) rcond(x, type = "O", ...))
323    
324    
325    
326    
327    
328    ## MM: More or less "Cut & paste" from
329    ## --- diff.default() from  R/src/library/base/R/diff.R :
330    setMethod("diff", signature(x = "Matrix"),
331              function(x, lag = 1, differences = 1, ...) {
332                  if (length(lag) > 1 || length(differences) > 1 ||
333                      lag < 1 || differences < 1)
334                      stop("'lag' and 'differences' must be integers >= 1")
335                  xlen <- nrow(x)
336                  if (lag * differences >= xlen)
337                      return(x[,FALSE][0])  # empty of proper mode
338    
339                  i1 <- -1:-lag
340                  for (i in 1:differences)
341                      x <- x[i1, , drop = FALSE] -
342                          x[-nrow(x):-(nrow(x)-lag+1), , drop = FALSE]
343                  x
344              })
345    
346    setMethod("image", "Matrix",
347              function(x, ...) { # coercing to sparse is not inefficient,
348                  ##               since we need 'i' and 'j' for levelplot()
349                  x <- as(as(x, "sparseMatrix"), "dMatrix")
350                  callGeneric()
351              })
352    
353    
354    ## Group Methods
355    
356    ##-> see ./Ops.R
357    ##         ~~~~~
358    ## For all  non-dMatrix objects, and note that  "all" and "any" have their own
359    setMethod("Summary", signature(x = "Matrix", na.rm = "ANY"),
360              function(x, ..., na.rm)
361              callGeneric(as(x,"dMatrix"), ..., na.rm = na.rm))
362    
363    
364    ### --------------------------------------------------------------------------
365    ###
366    ### Subsetting "["  and
367    ### SubAssign  "[<-" : The "missing" cases can be dealt with here, "at the top":
368    
369    ## Using "index" for indices should allow
370    ## integer (numeric), logical, or character (names!) indices :
371    
372    ## "x[]":
373    setMethod("[", signature(x = "Matrix",
374                             i = "missing", j = "missing", drop = "ANY"),
375              function (x, i, j, ..., drop) x)
376    
377    ## missing 'drop' --> 'drop = TRUE'
378    ##                     -----------
379    ## select rows
380    setMethod("[", signature(x = "Matrix", i = "index", j = "missing",
381                             drop = "missing"),
382              function(x,i,j, ..., drop) {
383                  if(nargs() == 2) { ## e.g. M[0] , M[TRUE],  M[1:2]
384                      if(any(i) || prod(dim(x)) == 0)
385                          as.vector(x)[i]
386                      else ## save memory
387                          as.vector(x[1,1])[FALSE]
388          } else {          } else {
389              if (Orthogonal.test(x, byrow = TRUE, normal = FALSE) <= tol)                    callGeneric(x, i=i, , drop=TRUE)
390                  val <- c("RowOrthogonal", val)                    ##                  ^^
391          }          }
392              })
393    
394    ## select columns
395    setMethod("[", signature(x = "Matrix", i = "missing", j = "index",
396                             drop = "missing"),
397              function(x,i,j, ..., drop) callGeneric(x, j=j, drop= TRUE))
398    setMethod("[", signature(x = "Matrix", i = "index", j = "index",
399                             drop = "missing"),
400              function(x,i,j, ..., drop) callGeneric(x, i=i, j=j, drop= TRUE))
401    
402    ## bail out if any of (i,j,drop) is "non-sense"
403    setMethod("[", signature(x = "Matrix", i = "ANY", j = "ANY", drop = "ANY"),
404              function(x,i,j, ..., drop)
405              stop("invalid or not-yet-implemented 'Matrix' subsetting"))
406    
407    ## logical indexing, such as M[ M >= 7 ] *BUT* also M[ M[,1] >= 3,],
408    ## The following is *both* for    M [ <logical>   ]
409    ##                 and also for   M [ <logical> , ]
410    .M.sub.i.logical <- function (x, i, j, ..., drop)
411    {
412        nA <- nargs()
413        if(nA == 2) { ##  M [ M >= 7 ]
414            ## FIXME: when both 'x' and 'i' are sparse, this can be very inefficient
415            as(x, geClass(x))@x[as.vector(i)]
416            ## -> error when lengths don't match
417        } else if(nA == 3) { ##  M [ M[,1, drop=FALSE] >= 7, ]
418            stop("not-yet-implemented 'Matrix' subsetting") ## FIXME
419    
420        } else stop("nargs() = ", nA,
421                    ".  Extraneous illegal arguments inside '[ .. ]' (i.logical)?")
422      }      }
423      val  setMethod("[", signature(x = "Matrix", i = "lMatrix", j = "missing",
424                             drop = "ANY"),
425              .M.sub.i.logical)
426    setMethod("[", signature(x = "Matrix", i = "logical", j = "missing",
427                             drop = "ANY"),
428              .M.sub.i.logical)
429    
430    
431    ## A[ ij ]  where ij is (i,j) 2-column matrix -- but also when that is logical mat!
432    .M.sub.i.2col <- function (x, i, j, ..., drop)
433    {
434        nA <- nargs()
435        if(nA == 2) { ##  M [ cbind(ii,jj) ] or M [ <logical matrix> ]
436            if(!is.integer(nc <- ncol(i)))
437                stop(".M.sub.i.2col(): 'i' has no integer column number;\n",
438                     "should never happen; please report")
439            if(is.logical(i))
440                return(.M.sub.i.logical(x, i=i)) # call with 2 args!
441            else if(!is.numeric(i) || nc != 2)
442                stop("such indexing must be by logical or 2-column numeric matrix")
443            m <- nrow(i)
444            if(m == 0) return(vector(mode = .type.kind[.M.kind(x)]))
445            ## else
446            i1 <- i[,1]
447            i2 <- i[,2]
448            ## potentially inefficient -- FIXME --
449            unlist(lapply(seq_len(m), function(j) x[i1[j], i2[j]]))
450    
451        } else stop("nargs() = ", nA,
452                    ".  Extraneous illegal arguments inside '[ .. ]' (i.2col)?")
453  }  }
454    setMethod("[", signature(x = "Matrix", i = "matrix", j = "missing"),# drop="ANY"
455              .M.sub.i.2col)
456    
457    
458  as.Matrix <- function(x, tol = .Machine$double.eps)  ### "[<-" : -----------------
459    
460    ## x[] <- value :
461    setReplaceMethod("[", signature(x = "Matrix", i = "missing", j = "missing",
462                                    value = "ANY"),## double/logical/...
463              function (x, value) {
464                  ## Fails for 'nMatrix' ... FIXME : make sure have method there
465                  x@x <- rep(value, length = length(x@x))
466                  validObject(x)# check if type and lengths above match
467                  x
468              })
469    
470    ## A[ ij ] <- value,  where ij is (i,j) 2-column matrix :
471    ## ----------------
472    ## The cheap general method --- FIXME: provide special ones; done for Tsparse..
473    ## NOTE:  need '...' below such that setMethod() does
474    ##        not use .local() such that nargs() will work correctly:
475    .M.repl.i.2col <- function (x, i, j, ..., value)
476  {  {
477      if (inherits(x, "Matrix")) return(asObject(x, Matrix.class(x, tol = tol)))      nA <- nargs()
478      asObject(as.matrix(x), Matrix.class(x, tol = tol))      if(nA == 3) { ##  M [ cbind(ii,jj) ] <- value  or M [ Lmat ] <- value
479            if(!is.integer(nc <- ncol(i)))
480                stop(".M.repl.i.2col(): 'i' has no integer column number;\n",
481                     "should never happen; please report")
482            else if(!is.numeric(i) || nc != 2)
483                stop("such indexing must be by logical or 2-column numeric matrix")
484            if(is.logical(i)) {
485                message(".M.repl.i.2col(): drop 'matrix' case ...")
486                ## c(i) : drop "matrix" to logical vector
487                return( callGeneric(x, i=c(i), value=value) )
488            }
489            if(!is.integer(i)) storage.mode(i) <- "integer"
490            if(any(i < 0))
491                stop("negative values are not allowed in a matrix subscript")
492            if(any(is.na(i)))
493                stop("NAs are not allowed in subscripted assignments")
494            if(any(i0 <- (i == 0))) # remove them
495                i <- i[ - which(i0, arr.ind = TRUE)[,"row"], ]
496            ## now have integer i >= 1
497            m <- nrow(i)
498            ## mod.x <- .type.kind[.M.kind(x)]
499            if(length(value) > 0 && m %% length(value) != 0)
500                warning("number of items to replace is not a multiple of replacement length")
501            ## recycle:
502            value <- rep(value, length = m)
503            i1 <- i[,1]
504            i2 <- i[,2]
505            ## inefficient -- FIXME -- (also loses "symmetry" unnecessarily)
506            for(k in seq_len(m))
507                x[i1[k], i2[k]] <- value[k]
508    
509            x
510        } else stop("nargs() = ", nA,
511                    ".  Extraneous illegal arguments inside '[ .. ]' ?")
512  }  }
513    
514    setReplaceMethod("[", signature(x = "Matrix", i = "matrix", j = "missing",
515                                    value = "replValue"),
516              .M.repl.i.2col)
517    
518    
519    setReplaceMethod("[", signature(x = "Matrix", i = "missing", j = "ANY",
520                                    value = "Matrix"),
521                     function (x, i, j, ..., value)
522                     callGeneric(x=x, , j=j, value = as.vector(value)))
523    
524    setReplaceMethod("[", signature(x = "Matrix", i = "ANY", j = "missing",
525                                    value = "Matrix"),
526                     function (x, i, j, ..., value)
527                     callGeneric(x=x, i=i, , value = as.vector(value)))
528    
529    setReplaceMethod("[", signature(x = "Matrix", i = "ANY", j = "ANY",
530                                    value = "Matrix"),
531                     function (x, i, j, ..., value)
532                     callGeneric(x=x, i=i, j=j, value = as.vector(value)))
533    
534    setReplaceMethod("[", signature(x = "Matrix", i = "missing", j = "ANY",
535                                    value = "matrix"),
536                     function (x, i, j, ..., value)
537                     callGeneric(x=x, , j=j, value = c(value)))
538    
539    setReplaceMethod("[", signature(x = "Matrix", i = "ANY", j = "missing",
540                                    value = "matrix"),
541                     function (x, i, j, ..., value)
542                     callGeneric(x=x, i=i, , value = c(value)))
543    
544    setReplaceMethod("[", signature(x = "Matrix", i = "ANY", j = "ANY",
545                                    value = "matrix"),
546                     function (x, i, j, value)
547                     callGeneric(x=x, i=i, j=j, value = c(value)))
548    
549    ## (ANY,ANY,ANY) is used when no `real method' is implemented :
550    setReplaceMethod("[", signature(x = "Matrix", i = "ANY", j = "ANY",
551                                    value = "ANY"),
552              function (x, i, j, value) {
553                  if(!is.atomic(value))
554                      stop(sprintf("RHS 'value' (class %s) matches 'ANY', but must match matrix class %s",
555                                   class(value),class(x)))
556                  else stop("not-yet-implemented 'Matrix[<-' method")
557              })

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