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[matrix] Diff of /pkg/Matrix/TODO
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Diff of /pkg/Matrix/TODO

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revision 2174, Wed Apr 23 11:21:37 2008 UTC revision 2175, Wed Apr 23 11:23:50 2008 UTC
# Line 121  Line 121 
121    above currently goes via "matrix" and back instead of using the 'x' slot    above currently goes via "matrix" and back instead of using the 'x' slot
122    directly; in particular, the triangular* "class property" is lost!    directly; in particular, the triangular* "class property" is lost!
123    
 - image(M, ..): Think about an optional smart option which keeps  
    "0 |-> transparent" and allows colors to differentiate negative and  
    positive entries.  
   
124  - examples for solve( Cholesky(.), b, system = c("A", "LDLt"....))  - examples for solve( Cholesky(.), b, system = c("A", "LDLt"....))
125    probably rather in man/CHMfactor-class.Rd than man/Cholesky.Rd    probably rather in man/CHMfactor-class.Rd than man/Cholesky.Rd
126    
# Line 177  Line 173 
173    Cholesky(......, Imult), also tests for hidden {hence no examples}    Cholesky(......, Imult), also tests for hidden {hence no examples}
174    ldetL2up() { R/CHMfactor.R }    ldetL2up() { R/CHMfactor.R }
175    
 - data(CAex); determinant(CAex) -- says  
   "Ask the package authors to implement the missing feature."  
   
176  - chol(<nsCMatrix>)  gives "temporarily disabled"  - chol(<nsCMatrix>)  gives "temporarily disabled"
177    but should give the *symbolic* factorization;    but should give the *symbolic* factorization;
178    similarly Cholesky(.) is not enabled    similarly Cholesky(.) is not enabled
179    
180    - writeMM(obj, file=stdout()) creates file "1" since file is silently
181      assumed to be a string, i.e. cannot be a connection.
182      An R (instead of C) version should be pretty simple, and would work with
183      connections automatically ["lsparse" become either "real" or
184      "pattern", "depending if they have NAs or not].

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