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...low down is noticeable. On my home computer with 512MB memory, this problem cannot be run. However, and that is my question/suggestion: Why not use Calloc+Free instead of R_alloc in vmmin (and maybe in other places)? I made the changes in 'optim.c' in the functions 'vmmin' and 'Lmatrix'. Then I rebuilt and reinstalled R-2.0.1. The result was great! My function ran very fast and without any memory problems. So why not? Or will this change create other problems? -- G?ran Brostr?m tel: +46 90 786 5223 Department of Statistics fax: +46 90 786 661...

...se dependencies of the Matrix package. Most users and package authors working with our 'Matrix' package will be using it for numerical computations, and so will be using "dMatrix" (d : double precision) matrix objects M, and indirectly, e.g., for M >= c will also use "lMatrix" (l: logical i.e. TRUE/FALSE/NA). All the following is **not** affecting those numerical / logical computations. A few others will know that we also have "pattern" matrices (purely binary: TRUE/FALSE, no NA) notably sparse ones, those "ngCMatrix" etc, all starting with &...

...trix package. > > Most users and package authors working with our 'Matrix' package will > be using it for numerical computations, and so will be using > "dMatrix" (d : double precision) matrix objects M, and indirectly, e.g., for > M >= c will also use "lMatrix" (l: logical i.e. TRUE/FALSE/NA). > All the following is **not** affecting those numerical / logical > computations. > > A few others will know that we also have "pattern" matrices (purely > binary: TRUE/FALSE, no NA) notably sparse ones, those "ngCMatrix"...

...atrix package. > > Most users and package authors working with our 'Matrix' package will > be using it for numerical computations, and so will be using > "dMatrix" (d : double precision) matrix objects M, and indirectly, e.g., for > M >= c will also use "lMatrix" (l: logical i.e. TRUE/FALSE/NA). > All the following is **not** affecting those numerical / logical > computations. > > A few others will know that we also have "pattern" matrices (purely > binary: TRUE/FALSE, no NA) notably sparse ones, those "ngCMatrix"...