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[Octave-bug-tracker] [bug #44315] Sparse single type

From: Ceral Paquet
Subject: [Octave-bug-tracker] [bug #44315] Sparse single type
Date: Thu, 19 Feb 2015 21:44:44 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Firefox/36.0


                 Summary: Sparse single type
                 Project: GNU Octave
            Submitted by: octavebugs
            Submitted on: Thu 19 Feb 2015 09:44:43 PM GMT
                Category: None
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Feature Request
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.8.2
        Operating System: Any



I would like to request thoughts on implementing sparse single matrices. The
main reason would be so that addition and multiply can be performed on
non-sparse single matrices and vectors. E.g.

 A = sparse(randn(10));
 x = randn(10,1,"single");
 b = A*x;

error: binary operator '*' not implemented for 'sparse matrix' by 'float
matrix' operations

I have an application that uses a sparse matrix multiply in amongst other
operations (FFT, dense multiplies, etc.) and it all has to be done in doubles
because of the sparse operator. The data comes in as 16-bit ints so single
precision is plenty.


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