NMatrix compatibility with rb-gsl

[Sameer Deshmukh]

Hello,

So here's my plan for full nmatrix compatibility of GSL:

• In every test file that is currently housed in the test/gsl folder, write an additional function or set of functions that will take an NMatrix as input and return an NMatrix as output for whatever functions are being tested in the file. Something similar to this NArray test that is already present.
• These tests will only be written for functions that actually compute something, and for conversion between GSL and NMatrix data types (for example, from GSL::Matrix to NMatrix).
• Once the tests have been written, I will start modifying the code so that the tests pass.
• When all the tests are passing, I will begin with fixing bugs relating to working with different GSL versions.
• Support for 1.15 will be dropped, and rb-gsl will support GSL 2.1 and 1.16 once the whole project is over.
• For accomplishing backwards compatibility with different GSL versions, guards will be placed in the C code.

Here's the github link for this issue - https://github.com/SciRuby/rb-gsl/issues/23

Eager to hear your thoughts on this.

[John Woods]

I think this sounds great.

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