Does the BLAS library has the capicity to do two band matrixes product? And which function did it?

Hi CLF gurus I was reading the BLAS reference and so I struck me. It is missing one routine! It is like xSCAL and xCOPY but it does it simultaneously. In the notation of BLAS: y <- alpha x. Why is this routine not included? Doing a copy first and then scaling is very inefficient, so why not do it at the same time (like xAXPY but with y=0 initially)? -- Henrik Holst, Sweden

Henrik Holst wrote: Hi CLF gurus I was reading the BLAS reference and so I struck me. It is missing one routine! It is like xSCAL and xCOPY but it does it simultaneously. In the notation of BLAS: y <- alpha x. Why is this routine not included? Doing a copy first and then scaling is very inefficient, so why not do it at...

On May 11, 12:55 pm, Jason Nielsen <j...@cs.sfu.ca> wrote: Does anyone know of iso_c_binding module(s) to allow blas and lapack to be called from C? I am aware of cblas etc. but it seems that given the C interface has become standard that something along these lines may have been written. My google search seems to indicate that such a thing does not exist but I was curious. ...

Does anyone know of iso_c_binding module(s) to allow blas and lapack to be called from C? I am aware of cblas etc. but it seems that given the C interface has become standard that something along these lines may have been written. My google search seems to indicate that such a thing does not exist but I was curious. Thanks, Jason

...I want to use idmax and idmin which should be in blas library. But according to the mannual of blas, they belong to the extension of blas. When can I get this? I think the "standard" BLAS routine for the index of maximum absolute value is idamax(). ... to replace these, but as with all of the BLAS routines, there are compromises and tradeoffs with efficiency and memory ...

... message news:47FEC332.6020604@nospamcomputer.org... foolcat wrote: I want to use idmax and idmin which should be in blas library. But according to the mannual of blas, they belong to the extension of blas. When can I get this? Any reason to prefer this over maxloc(abs(..... ? I was thinking ...

foolcat wrote: I want to use idmax and idmin which should be in blas library. But according to the mannual of blas, they belong to the extension of blas. When can I get this? Any reason to prefer this over maxloc(abs(..... ?

... 10, 3:21 pm, foolcat <xiaofengli...@gmail.com> wrote: I want to use idmax and idmin which should be in blas library. But according to the manual of blas, they belong to the extension of blas. Where can I get this? I found this at http://www.netlib.org/toms/686 : INTEGER FUNCTION IDMAX(X,N) C ...

I want to use idmax and idmin which should be in blas library. But according to the mannual of blas, they belong to the extension of blas. When can I get this? Thanks!