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ptc-41689401-Visitor
1-Visitor
April 28, 2013
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Given/Find function is telling me there isn't a solution when there is...

  • April 28, 2013
  • 1 reply
  • 2516 views

Hi,

So, I'm trying to use the given/find function to find the temperature of a substance at a given pressure. I have my equation for pressure as a function of temperature. I can type values in manually to get really close to what I'm looking for, but MathCAD keeps telling me there is no solution. The area of question is highlighted in blue.

Thanks,

Sam

Best answer by Werner_E

Strange - I don't understand why I get a slution (a complex one).

The cause for your problem is:

.) if you use symbolic evaluation you must not provide a guess value, the variable searched for has to be without value

.) if you use numeric evaluation it works as you had it set up

Find_symb1.png

Find_num1.png

1 reply

W
Werner_E25-Diamond IAnswer
25-Diamond I
April 28, 2013

Strange - I don't understand why I get a slution (a complex one).

The cause for your problem is:

.) if you use symbolic evaluation you must not provide a guess value, the variable searched for has to be without value

.) if you use numeric evaluation it works as you had it set up

Find_symb1.png

Find_num1.png

P
ptc-41689401-VisitorAuthor
1-Visitor
April 28, 2013

Thanks. I know I typed that in at some point and it wasn't working for me, but I guess I didn't have something else set up properly. I feel like I'm finding every way for the program not to work.

W
Werner_E25-Diamond I
25-Diamond I
April 28, 2013

I feel like I'm finding every way for the program not to work.

If thats true, you still will have a long way to go 😉

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