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[Octave-bug-tracker] [bug #59403] integral2 and quad2d functions do not
From: |
Luis Kao |
Subject: |
[Octave-bug-tracker] [bug #59403] integral2 and quad2d functions do not catch incorrect dimensions for matrix multiplication |
Date: |
Thu, 5 Nov 2020 11:25:08 -0500 (EST) |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.111 Safari/537.36 |
Follow-up Comment #4, bug #59403 (project octave):
After seeing the comments and checking the documentation again, I would like
to provide some extra arguments.
----
If the user's intention is to do matrix multiplication, they will expect a
matrix output. For example
function z = f(x,y)
z = sinc(x) * sinc(y);
endfunction
x = [1 2; 3 4];
y = [5 6; 7 8];
f(x, y)
=> 2.0836e-49 -3.7300e-50
2.0836e-49 -3.7300e-50
And since that's the form of the original function, I suspect that they would
want a matrix output from integral2/quad2d as well.
Another thing is that the documentation says
> F is a function handle, inline function, or string containing the
> name of the function to evaluate. The function F must be of the
> form z = f(x,y) where X is a vector and Y is a scalar. It should
> return a vector of the same length and orientation as X.
I don't know the implementation reason why Y should be a scalar, but it seems
like current behaviors of integral2/quad2d disagree with the documentation.
function z = f(x,y)
disp("Y isscalar:");
isscalar(y)
z = sinc(x) * sinc(y);
endfunction
integral2(@f, -1, 1, -1, 1);
The result from the script above is
Y isscalar:
ans = 0
Y isscalar:
ans = 0
Y isscalar:
ans = 0
Y isscalar:
ans = 0
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- [Octave-bug-tracker] [bug #59403] integral2 and quad2d functions do not catch incorrect dimensions for matrix multiplication, Luis Kao, 2020/11/03
- [Octave-bug-tracker] [bug #59403] integral2 and quad2d functions do not catch incorrect dimensions for matrix multiplication, Rik, 2020/11/03
- [Octave-bug-tracker] [bug #59403] integral2 and quad2d functions do not catch incorrect dimensions for matrix multiplication, John W. Eaton, 2020/11/03
- [Octave-bug-tracker] [bug #59403] integral2 and quad2d functions do not catch incorrect dimensions for matrix multiplication, Rik, 2020/11/05
- [Octave-bug-tracker] [bug #59403] integral2 and quad2d functions do not catch incorrect dimensions for matrix multiplication,
Luis Kao <=
- [Octave-bug-tracker] [bug #59403] integral2 and quad2d functions do not catch incorrect dimensions for matrix multiplication, Rik, 2020/11/05
- [Octave-bug-tracker] [bug #59403] integral2 and quad2d functions do not accurately document form of integrand function F, Rik, 2020/11/05
- [Octave-bug-tracker] [bug #59403] integral2 and quad2d functions do not accurately document form of integrand function F, David Bateman, 2020/11/12
- [Octave-bug-tracker] [bug #59403] integral2 and quad2d functions do not accurately document form of integrand function F, Luis Kao, 2020/11/14
- [Octave-bug-tracker] [bug #59403] integral2 and quad2d functions do not accurately document form of integrand function F, Luis Kao, 2020/11/14
- [Octave-bug-tracker] [bug #59403] integral2 and quad2d functions do not accurately document form of integrand function F, John W. Eaton, 2020/11/14
- [Octave-bug-tracker] [bug #59403] integral2 and quad2d functions do not accurately document form of integrand function F, Luis Kao, 2020/11/14