[Octave-bug-tracker] [bug #59403] integral2 and quad2d functions do not catch incorrect dimensions for matrix multiplication

[Luis Kao]

URL:
  <https://savannah.gnu.org/bugs/?59403>

                 Summary: integral2 and quad2d functions do not catch
incorrect dimensions for matrix multiplication
                 Project: GNU Octave
            Submitted by: kogiokka
            Submitted on: Tue 03 Nov 2020 06:15:14 AM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Missed Error or Warning
                  Status: None
             Assigned to: None
         Originator Name: Luis Kao
        Originator Email: 
             Open/Closed: Open
                 Release: 5.2.0
         Discussion Lock: Any
        Operating System: GNU/Linux

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Details:

Octave silently produces an "incorrect" result when the input function F does
not use element-by-element multiplication. This behavior is different from
MATLAB, which throws the error message: 

```
Error using  * 
Incorrect dimensions for matrix multiplication. Check that the number of
columns in the first matrix matches the number of rows in the second matrix.
To perform elementwise multiplication, use '.*'.
```

== Example Script ==

f = @(x, y) sinc(x) * sinc(y);
integral2(f, -1, 1, -1, 1)
    => 12.32805347760951

f = @(x, y) sinc(x) .* sinc(y);
integral2(f, -1, 1, -1, 1)
    => 1.389993237875656





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