topic Re: equation in Mathcad

equation

kakomoji323 — Tue, 18 Aug 2020 13:28:26 GMT

hello everyone I try to use help quick sheets and I wrote the following eq but I get the red line almost for all the results and I do exactly step by step im sure there is something missing here but I can not find it could you check it out and let me know what's is the problem

plz check the attachment

Re: equation

PTCModerator — Mon, 21 Oct 2019 17:01:39 GMT

Hello @kakomoji323

What product is this in reference to?

Thank you,

PTCModerator

Re: equation

LucMeekes — Mon, 21 Oct 2019 17:32:33 GMT

Please attach your worksheet containing the equation.

Success!
Luc

Re: equation

kakomoji323 — Thu, 24 Oct 2019 04:43:08 GMT

thank you for response I figured out , and I wrote it down, my question is , how this output plot change depend on R value, I mean I would like to add variable value of R from 0.1 to 5 ohm . in attached file r is fixed but I want make a loop with 5 different value of R .

thank you in advance

Re: equation

VladimirN — Wed, 23 Oct 2019 08:54:28 GMT

See this discussion: https://community.ptc.com/t5/PTC-Mathcad/Plotting-a-family-of-curves/m-p/43766

Re: equation

kakomoji323 — Thu, 24 Oct 2019 03:51:57 GMT

thank you for response I figured out , and I wrote it down, my question is , how this output plot change depend on R value, I mean I would like to add variable value of R from 0.1 to 5 ohm I attached the file .

thank you in advance

Re: equation

kakomoji323 — Thu, 24 Oct 2019 05:48:56 GMT

hank you for help but I could not find my answer , I need to find the out put with 4 different value of R I already made a R vector BUT I could not find solution

Re: equation

Werner_E — Thu, 24 Oct 2019 14:24:06 GMT

You will have to turn all constants which depend on R into functions of R and add R as additional argument to your existing functions.

I show it here for the first few expressions

Re: equation

kakomoji323 — Fri, 25 Oct 2019 05:38:40 GMT

I applied all the change you said and simplified the eq please check the plot . I made a R vector and it applied to all equation but as you see in picture it make no sense to me I need to show how I(current ) change due to different R, for that I need a 3 value plot which show G,I,R I tried 3d plot but it said value not defined could you explain how to make it

Re: equation

LucMeekes — Fri, 25 Oct 2019 05:58:18 GMT

You did NOT apply all necessary changes.

What you show here is I's only dependent on phi, not on R.

From your remark I understand that you essentially need a 3-d plot. In that case follow my example of this thread: https://community.ptc.com/t5/PTC-Mathcad/equation/td-p/631776

Success!
Luc

Re: equation

kakomoji323 — Fri, 25 Oct 2019 06:37:31 GMT

this is almost the same eq that I post with some change it end up like that I used you example to write R vector but how to use G plot depend on fi and R I don't understand. please check the attachment there is 6 equations and I cant not apply those change to all of them

Re: equation

kakomoji323 — Mon, 28 Oct 2019 07:20:25 GMT

I don't know how to apply to all equation I've try as you said but not working

Re: equation

LucMeekes — Mon, 28 Oct 2019 10:07:16 GMT

Attach your worksheet, saved as a Mathcad 11 .MCD file and I'll see if I can help you.

Success!
Luc

Re: equation

Fred_Kohlhepp — Mon, 28 Oct 2019 13:28:45 GMT

"there is 6 equations and I cant not apply those change to all of them "

Unfortunately, sometimes, to make the changes we need to requires a lot of modifying. Mathcad (15 and before) had a very robust and extremely useful "Find and replace," function for these kinds of changes. The one available in Prime is woefully underpowered and inadequate for the task.

Sorry! Start editing.

Re: equation

LucMeekes — Mon, 28 Oct 2019 22:52:18 GMT

There are two remarks to be made regarding the definition of the function G(phi):

There is a FOR loop that uses loop variable n, but n is not used further in the function.

There is a number of IF statements, covering the range 0 to 2pi, but what if phi is <0 or > 2pi...? You need an OTHERWISE.

Success!
Luc

Once more. Here's an example for a (plot of) a function of two variables:

Re: equation

kakomoji323 — Tue, 29 Oct 2019 05:59:49 GMT

here you are I really appreciate you help

Re: equation

kakomoji323 — Tue, 29 Oct 2019 06:37:06 GMT

luc thank you with response , IF function I use because each I (current ) has specific interval for example I2 FROM PI/3 TO 2PI/3 only that means each I has own phi just I need to check and study how R can effect current in equation

Re: equation

Werner_E — Tue, 29 Oct 2019 10:55:56 GMT

See if the attached file helps

Re: equation

kakomoji323 — Wed, 30 Oct 2019 06:20:13 GMT

I really appreciate this. thank you so much , I do my best to learn Mathcad , every example you guys give I learn something new.

Re: equation

LucMeekes — Wed, 30 Oct 2019 14:53:20 GMT

Nice!

...' irritation loop '...

well chosen designation, or typo?

Luc