Integration of the zero function handle ie f(x)=@(x) 0

I have a function that requires the integration of many functions and sometime that function is zero but I don't really know when that will be.... Unfortunately, integral(@(x)0,0,1) returns the following error; Output of the function must be the same size as the input. If FUN is an array-valued integrand, set the 'ArrayValued' option to true. How do I get around this? Any help would be great!!

Thanks

Drew

Answer 1

[Walter Roberson]

integral(@(x) 0 * x, 0, 1)

or

integral(@(x) zeros(size(x)), 0, 1)

[Drew Mitchell]

I am using matlabFunction() to create my function handles from symbolic expressions and I do not know when it will be returning the zero function handle. Is there another way?

Thanks for the response.

Drew

[Walter Roberson]

I seem to be having difficulty getting that automatically generated. matlabFunction does seem to reduce it down to a single 0.0

Here is a test you can use:

F = matlabFunction(YourExpression);
syms zzzzzz
Fzzzzz = F(zzzzzz);
if isempty(symvar(Fzzzzz))
  F = @(x) Fzzzzzz * ones(size(x));
end

This should work for constants other than 0 as well.

[Drew Mitchell]

Great thanks!