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489 Views 11 Replies Latest reply: Jan 7, 2014 10:43 AM by WE RSS
ptc-4397077 Bronze 52 posts since
Jan 6, 2012
Currently Being Moderated

Jun 6, 2013 2:52 PM

Possible to create iterative solve blocks?

In the attached MathCAD 14 worksheet I am attempting to solve for the embedment length for multiple sets of variables ( concrete dimensions a,b,ma,mb) using the Given command/block. Is it possible to pass multiple groups of variables in these three equations and solve for the single variable E using the Given block?

For each set of variables only one equation is solvable for E while the other two will not be solveable. The solvable equation changes as the dimensions changes. If the equation is not solvable, is it possible to for MathCAD to return a zero or unsolveable response instead of turning red?

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  • WE Platinum 4,291 posts since
    Nov 3, 2009
    Currently Being Moderated
    Jun 6, 2013 5:00 PM (in response to ptc-4397077)
    Re: Possible to create iterative solve blocks?

    Not sure what kind of iteration you are talking about in the subject.

     

    But if you get riod of the range variable and the elementwise (subscribted/indexed) notation using it, make E a 3x1 vector and, again, use vectorize, you get a solution.

     

    Not sure about what you mean with only one equ would give a solution?

     

    Concerning error catching you could turn the solve block into a parameterized function (whatever the input parameters would be) and create a new function using the "on error" statement to return NaN if the solve block function fails. See attached

    But in your case it failed always because of kind bad syntax.

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  • AndyWesterman Gold 274 posts since
    Feb 14, 2008
    Currently Being Moderated
    Jun 7, 2013 7:25 AM (in response to ptc-4397077)
    Re: Possible to create iterative solve blocks?

    If you make the solve blocks as parameterized functions you can calculate the 3 results.

    if some of them don't converge to a solution there was a function "ReDefine" posted on this forum which takes a text string parameter.

    if there is a variable of that name it returns the value, if not it returns  "Undefined" & this can be used in subsequent calculations.

     

    Hope this is what you want

    regards

    Andy

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