topic Re: Solve Block help in Mathcad

Solve Block help

MK_9183946 — Fri, 27 Dec 2024 19:07:14 GMT

Hej Guys, i am new to Mathcad and not very familar with it i have a worksheet with some functions and no i wanted to use the solveblock to find some solutions for me but i have no idea how i should write it down.

i added the worksheet with the functions. i have a function with two Variables that where i want to find those two variables when i only know one result of the two out put results that the funcions brings me.

the constraints i have and the expted result i put to the worksheet. maybe someone can give me some advise on how the solveblock need to be set up for a function with two variables?

Kind Regards

Markus

Re: Solve Block help

ppal — Mon, 30 Dec 2024 02:08:39 GMT

Use this example to set up your seed values, constraints

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwjt2JK4tM6KAxXEUWwGHWK5JqMQtwJ6BAgEEAI&url=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DUDJEKwf_lpU&usg=AOvVaw01HAK2TXYSoP-5HgVxUuRu&opi=89978449

Re: Solve Block help

MK_9183946 — Mon, 30 Dec 2024 06:19:34 GMT

do i then need to redefine all equations in the solveblock? cause all of them are within a function and Mathcad is telling me i am not using apropiate constraints?

Re: Solve Block help

LucMeekes — Mon, 30 Dec 2024 10:49:31 GMT

You need to provide guess values for all variables that you want to solve.

According to the Find function, you are trying to solve L_lift and L_tilt, while you provide guess values for HPH and AA. That does not match...

Attach your (modified) worksheet and state which version of Prime you are using.

Success!
Luc

Re: Solve Block help

MK_9183946 — Mon, 30 Dec 2024 12:06:11 GMT

Hej Luc,

i have changed my sheet and put guess values for l_lift and L_tilt but still says i don't have a valid constraint:

i am running Prime 7 and have attached the updated sheet

Thanks for the reply!

Kind Regards

Markus

Re: Solve Block help

LucMeekes — Mon, 30 Dec 2024 14:42:18 GMT

Still not according to the rules. Now you seem to have 4 variables to solve, given the:

And you have only two constraints involving only a single one of the four variables.

(To solve for 4 variables, you need 4 constraints, independent equations).

Here's an example:

I've put the same thing in a sheet for you, see attachment.

Success!
Luc

Re: Solve Block help

MK_9183946 — Tue, 31 Dec 2024 06:55:27 GMT

Hej Luc,

thank you so much, that was the eye opener, instead of backward i used the forward function and changed the outputmatrix to give me more results that i than could use in the solveblock to give me my constraints that i have!

man so glad it worked out, didn't work yesterday but i just woke up and could finish it, i wish you a good slide in to new year 🙂

here's a pic of the changes:

Kind Regards

Markus