time integral with a non-constant var...

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Author Message   Mehdi Naderi (mnader4) Member Username: mnader4 Post Number: 59 Registered: 12-2006 Posted on Tuesday, December 30, 2008 - 12:12 pm:    Dear Mr. Nelson, I will appreciate if you help me: the attaches are my files. I am trying to calculate tim_integral (source/t1) which source and t1 are time dependent. I dont know why the result of the above is zero on the plot. regrads, mehdi t1 t1.txt (36.3 k) torsion Torsion.pde (5.1 k)   Robert G. Nelson (rgnelson) Moderator Username: rgnelson Post Number: 1201 Registered: 06-2003 Posted on Wednesday, December 31, 2008 - 07:18 pm:    TINTEGRAL computes the time integral of a scalar value. The argument of your TINTEGRAL is different in different regions. You therefore need to specify a location for evaluation. The ELEVATION sees that its argument is a scalar, so it ignores the position statement. The TINTEGRAL is therefore evaluated at some unspecified location, which in this case produces a zero. You should give the TINTEGRAL a scalar argument, as in TINTEGRAL(VAL(thing, 0,r3,0.13))