topic Re: PTC Mathcad 15 equation solving problem. in Mathcad

PTC Mathcad 15 equation solving problem.

BT_10669824 — Mon, 15 May 2023 19:44:04 GMT

Dear Friends, I am using Mathcad 15. I use electronic books. The book has the solution of the system of equations related to Mathcad 15. However, I cannot solve the formula system even though I do the same. I'm getting an error.
I'm posting screenshots from the book and my own implementation.
I am also attaching the Mathcad file. I'm waiting for youExample in the bookScreenshot and error that I implementedr help.

Re: PTC Mathcad 15 equation solving problem.

LucMeekes — Mon, 15 May 2023 22:06:17 GMT

Your VD in the second equation, above the 0.5 kOhm, is labelled as a constant, instead of as a variable.

Success!
Luc

Re: PTC Mathcad 15 equation solving problem.

Werner_E — Mon, 15 May 2023 22:15:58 GMT

The problem is SUC (static unit check) in Mathcad 15

Delete the evaluation after the Find command and assign the result to a vector with two variables to get the desired result

The E-Book was written for a very old version of Mathcad which did not use SUC. This old version allowed the display of a vector/matrix which contains quantities of different dimensions (voltage and amperage in your case). Mathcad 15 does not allow for this and the error message unfortunately is misleading.

See attached sheet

Re: PTC Mathcad 15 equation solving problem.

BT_10669824 — Tue, 16 May 2023 09:12:27 GMT

Thank you very much. Your Problem Has Been Solved. I'm also having trouble with Unit conversion. For example, I get Ampere. How can I change it to MilliAmps. Please forgive my inexperience. Thanks again

Re: PTC Mathcad 15 equation solving problem.

Werner_E — Tue, 16 May 2023 11:14:10 GMT

Mathcad will always display results in the base units of the unit system chosen.

But if you click in that region you will notice a black placeholder to the right of the unit where you can write the unit you would like to see.

And when you leave that region you see the desired display

Mathcad will also take care of additional changes which might be necessary

Here is what you see if you accidentally type in V (volt) in that placeholder

Re: PTC Mathcad 15 equation solving problem.

BT_10669824 — Tue, 16 May 2023 13:32:57 GMT

Thank you very much