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how to simplify an expression with both variables and numbers

myang
2-Explorer

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

ACCEPTED SOLUTION

Accepted Solutions
AlanStevens
17-Peridot
(To:myang)

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

View solution in original post

14 REPLIES 14

May be this help you:

IU.png

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

AlanStevens
17-Peridot
(To:myang)

Does the attached help?

Alan

myang
2-Explorer
(To:AlanStevens)

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

RichardJ
19-Tanzanite
(To:myang)

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.

myang
2-Explorer
(To:RichardJ)

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

RichardJ
19-Tanzanite
(To:myang)

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

myang
2-Explorer
(To:RichardJ)

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

RichardJ
19-Tanzanite
(To:myang)

Yes, it runs fine for me.

myang
2-Explorer
(To:RichardJ)

All right....I think I may need to change a computer and run it again.....But thank you very much for helping me figure out the problem.

RichardJ
19-Tanzanite
(To:myang)

It's more likely to be your version of Mathcad than the computer. "Invalid pointer" sounds like a bug to me.

myang
2-Explorer
(To:RichardJ)

Could you provide me the screenshot of the expression of the Imaginary part please? I think if I got the result of that, I would be able to complete my calculation......Thank you

AlanStevens
17-Peridot
(To:myang)

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

myang
2-Explorer
(To:AlanStevens)

Thank you very much! you help a lot.

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