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`sprandsymposdef`

Carsten Bauer requested to merge cb/sprandsym into master

See #9 (closed).

Apart from renamings like generate_input_matrix -> sprandsymposdef, this PR introduces sprandsymposdef(n, p, cn) that allows one to specify a certain condition number (before this PR we only had sprandsymposdef(n,p)).

For the used algorithm, see the docs(trings). We haven't optimized for performance at all here, so there is lots(!) of room for improvement. But this can go into a separate PR.

MATLAB:

This PR also adds MATLAB.jl (as per Requires.jl) as an optional dependency. If using MATLAB is executed after using SubmatrixMethod the function SubmatrixMethod.sprandsym becomes available which represents a direct Julia-interface to the MATLAB function sprandsym (A MATLAB session will run in the background! See MATLAB.jl for details).

Closes #9 (closed)

Edited by Carsten Bauer

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