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how to simplify an expression with both variables and numbers

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how to simplify an expression with both variables and numbers

Hi All,

This is my first time using Mathcad...... I have this problem which seems to be not hard, however I just can't figure out..........

Would anyone like to help me out here? I've include text explanation of my problem in the attached file.

Many thanks in advance!

Mingyu

1 ACCEPTED SOLUTION

Accepted Solutions

Re: how to simplify an expression with both variables and numbers

Here's a screenshot:

voltageripple.PNG

I've attached a pdf printout (though you will have to line up pages 3 and 4 with 1 and 2 respectively.

Alan

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14 REPLIES 14

Re: how to simplify an expression with both variables and numbers

May be this help you:

IU.png

Re: how to simplify an expression with both variables and numbers

Does the attached help?

Alan

Re: how to simplify an expression with both variables and numbers

Thank you, Valery. Reminds me that I need to make expression as function of unspecified variables.

Re: how to simplify an expression with both variables and numbers

Thank you very much, Alan. It's very helpful. Learn a lot from your tips. But please allow me to ask another question.........

I runned your attached file but yours stopped at the calculation of C with no result.

This happened to my original file as well, but mine gave me something as below. It just fails to extract the imaginary part of Ztot.....It doesn't make sense to me as it's able to get the real part....

Capture.PNG

Re: how to simplify an expression with both variables and numbers

Hard to be sure without seeing the file, but if you click on Im(Ztot) you will probably see a multiplication between the Im and the parenthesis, so it sees Im as a variable, not a function name.

Re: how to simplify an expression with both variables and numbers

Richard,

Thank you for the reminder......But why does this happen and how to correct this? This pic is what happened when I tried to extract the imaginary part.... I attached my file. Could you help me correct it please? Thanks a lot.

invalide+pointer.PNG

Re: how to simplify an expression with both variables and numbers

I don't see this problem. What version of Mathcad are you using?

Re: how to simplify an expression with both variables and numbers

It's Mathcad14. You mean it runs okay in your computer?

Re: how to simplify an expression with both variables and numbers

Yes, it runs fine for me.

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