MathCad Iteration 1

engrAlan · Oct 10, 2012

Hi,
Can anybody help me translate these iteration in Mathcad function?
Givien
P=0.30kip
h=33ft
B=2.50ft
d=5ft
S=0.20ksf/ft
F=2

Calculated
S1=F*S*min(d/3,12ft)
A=2.34*P/(B*S1)
d1=A/2*(1+sqrt(1+4.36*h/A))
d2=(d+d1)/2 (new d will be the average of d1&d2, d2&d3, and so on.

then S1 will be recalculated using new d2, also "A" will be recalculated using new value of S1 i want to iterate using mathcad until (di+di+1) is almost equal.

Thanks

IRstuff · Oct 10, 2012

There are functions in Mathcad for directly solving equations like that. See Given-Find and Given-Minimize in the help files.

TTFN
faq731-376

engrAlan · Oct 10, 2012

Thanks IRstuff,i already tried searching but i can't find similar case and i can't figure out how it should be formulated.

IRstuff · Oct 10, 2012

I can't get your units to balance, so that's on you. Attached is what I think you're trying to do, based on your description:

http://files.engineering.com/getfil...d10-43e8-9d4a-fdc8fcb32574&file=ET_121010.mcd

TTFN
faq731-376

Occupant · Oct 10, 2012

"until (di+di+1) is almost equal" almost equal to what?

engrAlan · Oct 10, 2012

Sorry guys! my intention is to keep on averaging the values of d, so it should be "values of last two d, will be the same".

engrAlan · Oct 10, 2012

IRstuff, thanks for your effort. I managed to clear the units, please find attached file, but it seems that the result was not iterated, it only repeats the previously calculated value.

engrAlan · Oct 10, 2012

Guys, attached is the one I am trying to find a shorter way of doing it and thinking Mathcad iteration. I reached 6 iteration before i got the required value. I appreciate spending your spare time with this.

IRstuff · Oct 10, 2012

It would have helped if you had given the same values that you actually used this time:

http://files.engineering.com/getfil...1-4870-bfe3-8fc2a23d792d&file=ET_121010A.xmcd

There is almost no reason that you should ever have to manually iterate in Mathcad. Its raison d'etre is problems like this.

TTFN
faq731-376

engrAlan · Oct 10, 2012

Thank you IRstuff, this is a great help. Mathcad is very helpful, i only have 3 steps with your given formula, while i was having almost 27 steps. Thanks again.

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MathCad Iteration 1

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