Integration with quad

[Thomas Göbel]

Hi all,

i want to integrate the following function:

function y = rect(t)
if t<=0.5
    rect=1
else
    rect=0
end
endfunction

For integration i use 

foo = quad('rect',-1,2)

but get the following error message.

warning: rect: some elements in list of return values are undefined
error: invalid conversion from real matrix to real scalar
error: quad: evaluation of user-supplied function failed

I dont understand why octave tells me there is an invalid conversion.
Hope somebody can help me.

Thanks,
Tom
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