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

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revision 1844, Wed May 16 20:40:34 2007 UTC revision 1845, Wed May 16 21:24:41 2007 UTC
# Line 130  Line 130 
130    
131  - sparse-symmetric + diagonal should stay sparse-symmetric  - sparse-symmetric + diagonal should stay sparse-symmetric
132    (only stays sparse): Matrix(0, 4, 4) + Diagonal(4, 1:4)    (only stays sparse): Matrix(0, 4, 4) + Diagonal(4, 1:4)
133      --> R/diagMatrix.R ('FIXME')
134      but also R/Ops.R  to ensure  sp-sym. + sp-sym. |-> sp-sym.  etc
135    
136  - For a square sparse matrix 'b' {typically dgCMatrix or dgTMatrix},  - For a square sparse matrix 'b' {typically dgCMatrix or dgTMatrix},
137    we'd want a function  "Mat_plus_t_Mat" <- function(b) {....}    we'd want a function  "Mat_plus_t_Mat" <- function(b) {....}

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