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Solving a function with indices

thread552-309785

Solving a function with indices

Solving a function with indices

(OP)
I'm having trouble getting an iterative equation to solve. I can do it manually, so there is an answer, but for some reason MathCAD won't solve

1.552 = (V1 + 10)^1.4 / V1^1.4

It also works fine if I remove the indices

 

RE: Solving a function with indices

Actually, the typical request is for M11 versions, before Mathsoft made their ill-fated conversion to M12.

The first question is why you're using the symbolic solve, given that you obviously need a numerical answer, and the algebraic solution of your question is relatively trivial.

You ought to be using either Given-Find or Given-Minerr, as shown in the attached sheet.  Minerr generally will be more tolerant of ill-formed equations, while Find requires the solution to be within the default tolerances set within Mathcad.  Minerr will usually find a solution that only minimizes the error.

http://files.engineering.com/getfile.aspx?folder=6639ad2b-5c45-467f-90f8-979b3160b1d6&file=file_minerr.xmcd

TTFN

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