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ptc-36826231-Visitor
1-Visitor
Dec 20, 2014 3:21 PM UTC
Solved

this value must be an integer

Hi

I need help,because I dont know what I do wrong. Please help.Thanks for help

ptc-3682623Answer
1-Visitor
Dec 22, 2014 11:24 AM UTC

This is the correct answer.

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7 replies

Werner_E
Werner_E25-Diamond I
25-Diamond I
Dec 20, 2014 5:18 PM UTC

You misused the range i as index of y which for obvious reasons can't be allowed unless you use Mathcad's feature of implicit looping as you did in the definition of x two lines above.

Which value(s) and which data structure did you think that k[1 would have?

But even if you would have used k1[i:=... - what do you think a vector index is? Its a position number of a vector element.

So why did you use something like x[(i+0.5) or even y[(i+0.5*k1. Obviously a vector index must be an integer - there is no position 1.73 in a vector, just 1 or 2.

I would suggest you study the basics of vectors and ranges more thoroughly.

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ptc-36826231-VisitorAuthor
1-Visitor
Dec 20, 2014 8:28 PM UTC

If You would like solve this problem in xmcd I will be grateful You. I need solve differential equation metod of Rung-Kutta

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Werner_E
Werner_E25-Diamond I
25-Diamond I
Dec 20, 2014 8:58 PM UTC

I guess your question would have better been placed in Mathcad/Homework Help.

I understand that you think it would be easier for you if I would do your work, but I guess that the purpose of that assignment is to get you more familiar with Mathcad and the thus implemented mathematical algorithms.

So I suggest again that you do your homework and have a closer look at the basics of Mathcad. Then try again and if you get stuck come back here again.

Maybe, if you search this forum for "Runge Kutta", you may find some useful hints.

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