Such a simple formula,but when I run MC is automatically closed!!

[ptc-5025903]

Run this simple formula ,input z in the 3 d map Spaces below, click outside the figure to look at the picture of mathcad is automatically closed ,i do not know why ,is everyone same to me??

[AlanStevens · Accepted solution]

Mathcad doesn't close for me. However, your problem is probably related to the fact that in the numerator of your atan argument you have x(y+1) with no explicit multiplication sign between the x and the y+1, so Mathcad thinks it's a function. Insert a multiply immediately after the x.

Alan

[ptc-5025903]

thank you , as you say, the problem is sloved !