bugGNU Octave - Bugs: bug #55141, sparse matrix/vector comparison

 
 

bug #55141: sparse matrix/vector comparison

Submitted by:  Ray Zimmerman <rdzman>
Submitted on:  Fri 30 Nov 2018 08:49:46 PM UTC  
 
Category:  Interpreter Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Unexpected Error or Warning
Status:  Duplicate Assigned to:  None
Originator Name:  rdzman Open/Closed:  Closed
Release:  4.4.1 Operating System:  Any

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Sat 01 Dec 2018 04:47:31 AM UTC, comment #1: 

Unfortunately this is a known bug involving broadcasting.  See bug #41441.

For the time being, you should use repmat to create a comparison array from the single column vector.  Along the lines of

A = [1 3; 7 5]; b = [2; 6];
b = repmat (b, [1, columns(A)]);
sparse (A) < sparse (b)

This will work in Octave or Matlab.

Marking as a duplicate and keeping the original report at bug #41441 open.

Rik <rik5>
Project Administrator
Fri 30 Nov 2018 08:49:46 PM UTC, original submission:  

Comparing a matrix with a vector works fine for full and sparse matrices on Matlab, but on Octave it gives an error for sparse matrices.

octave:1> A = [1 3; 7 5]; b = [2; 6];
octave:2> A < b
ans =

  1  0
  0  1

octave:3> sparse(A) < sparse(b)
error: mx_el_lt: nonconformant arguments (op1 is 2x2, op2 is 2x1)

On Matlab, however, it works fine ...

>> A = [1 3; 7 5]; b = [2; 6];
>> A < b

ans =

  2x2 logical array

   1   0
   0   1

>> sparse(A) < sparse(b)

ans =

  2x2 sparse logical array

   (1,1)      1
   (2,2)      1

Ray Zimmerman <rdzman>

 

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    Follow 4 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2018-12-01 rik5 CategoryNone => Interpreter
        StatusNone => Duplicate
        Open/ClosedOpen => Closed
        Dependencies- => Depends on bugs #41441

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