mkl_?csradd

[Wolfram_R_]

Dear all

looks as if I need to use mkl_?csradd (C++).

However, my csr matrix is zero based; mkl_?csradd does only support one based sparse matrices.

I would appreciate any suggestions for a pragmatic solution.

A simple application example of mkl_?csradd would be nice, too.

Kind regards

Wolfram

[mecej4]

I cannot help you as to zero-based indexing, other than to point out something for you to consider: although some programming languages default to zero-based indexing, in mathematics and physics it is more common to use 1-based indices. For example, we use x₁, x₂ and x₃ as position coordinates rather than x₀, x₁ and x₂ . What are the natural indices in your subject domain?

MKL provides the following Fortran examples in examples_core.zip:

spblasf/source/zcsr_addition.f
spblasf/source/dcsr_addition.f
spblasf/source/scsr_addition.f
spblasf/source/ccsr_addition.f

As it is, addition of sparse matrices is not a complicated subject. An entry in the result matrix C is non-zero if either or both of the corresponding entries in A and B are non-zero. If only one of the two is non-zero, we copy the value to C; when both are non-zero, we place the sum in C.