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I think you want to clear variables x and y before the definition of Phi. That seemed to get result to evaluate for me. It isn't exactly the same value as shown in the Mathcad Snapshot, but its close. Edit: The other thing you could do is change the variables of integration to something other than x and y.  Edited by user 28 April 2017 01:03:57(UTC)
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... thanks collab for helping. I don't catch "Clear(x,y)"
Worst: it must be evaluated !!! Clear(x,y)=1 [Accepted].
One bug remains in 6179: if the function is complex,
CAN NOT use index 'i' ... a minimal setup is now running.
Will report is it stops calculate.
Smath integrator is horribly slow, even at minimal accuracy.
Jean
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... to be tried: instead of absolute in the "P for loops"
the Matlab code may be more effective. To get the Greek
letters in the forum: copy/paste from the Smath work sheet.
Jean
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