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gghazi1-Visitor
1-Visitor
October 5, 2015
Solved

find is undefined in mathcad 15

  • October 5, 2015
  • 2 replies
  • 2245 views

can somebody help me please in understanding  this error message " this variable is undefined" in attached file

Best answer by RichardJ

The error messages from solve blocks are useless. There is only one: "this variable is undefined". You get that even if the problem has nothing to do with undefined variables.

In your case there are two immediate problems. First, your functions IFC1, IFC2, IFC3, IFC4 are undefined. Second, you have 8 equations but you are only solving for 5 unknowns. The number of equations must be the same as the number of unknowns.

2 replies

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RichardJ19-TanzaniteAnswer
19-Tanzanite
October 5, 2015

The error messages from solve blocks are useless. There is only one: "this variable is undefined". You get that even if the problem has nothing to do with undefined variables.

In your case there are two immediate problems. First, your functions IFC1, IFC2, IFC3, IFC4 are undefined. Second, you have 8 equations but you are only solving for 5 unknowns. The number of equations must be the same as the number of unknowns.

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    gghazi1-VisitorAuthor
    1-Visitor
    October 6, 2015

    thank you Mr.Richard Jackson for your help

    I wrote only  four functions and I got at a meaningful result

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