Solved: find is undefined in mathcad 15

gghazi · ‎Oct 04, 2015

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

RichardJ · ‎Oct 05, 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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RichardJ · ‎Oct 05, 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.

gghazi · ‎Oct 05, 2015

thank you Mr.Richard Jackson for your help

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