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Offline Darcy  
#1 Posted : 25 April 2022 10:13:57(UTC)
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Hi all,
I am trying to solve for an unknown variable on Smath, a very straight forward operation on my calculator, however I'm trying to figure out how to display it on an Smath work sheet. Thanks in advance for your help. I am currently just using the solve function, inputting the function with the undefined parameter, A.st, and using tthe booleen operator to allow for calculation and it is saying no real roots...
SMATH HELP.pngSMATH HELP.jpg

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Offline overlord  
#2 Posted : 25 April 2022 14:15:43(UTC)
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Click to enlarge

solve_roots.sm (13kb) downloaded 13 time(s).

Edited by user 25 April 2022 21:42:23(UTC)  | Reason: Not specified

Offline uni  
#3 Posted : 25 April 2022 14:22:41(UTC)
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This works too: al_nleqsolve(guess,f)

al_nleqsolve.jpg
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Offline Darcy  
#4 Posted : 25 April 2022 15:11:57(UTC)
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Thankyou for your reply, if possible could you explain what you mean, i will upload a smath file of the sheet i am working on, if you could have a look, it would be greatly appreciatd!
Offline Darcy  
#5 Posted : 25 April 2022 15:13:04(UTC)
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ASSINGMENT_1.sm (921kb) downloaded 14 time(s).

Cheers Guys!!
Offline overlord  
#6 Posted : 25 April 2022 16:17:41(UTC)
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Here is your file solved with various solvers.
I also corrected your formula depending on your first question.
d.eff is multiplied in your file, subtraction occurs at first post.

solve() can solve between -20,20 range as default.
If your result shall be out of this bound, you will need to specify it.
Or you can change your default roots range from Tools>Options>Calculations.

FindRoot() can also solve equations with units as maple-solve.
Just give it a boolean guess to start calculation with.
Be careful, it will assign your unknown with result.

Regards

ASSINGMENT_1_result.sm (1,015kb) downloaded 19 time(s).

2022-04-25_17-02.png

Edited by user 25 April 2022 17:05:08(UTC)  | Reason: Not specified

thanks 1 user thanked overlord for this useful post.
on 25/04/2022(UTC)
Offline overlord  
#7 Posted : 25 April 2022 20:19:15(UTC)
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You can also solve your problem with quadratic formula.

Regards

2022-04-25_20-23.png

And here is your one-line algebraic solution.
It is derived from quadratic formula.
Numeric solvers not involved.

2022-04-26_02-44.png

Edited by user 26 April 2022 02:46:12(UTC)  | Reason: Not specified

Offline Darcy  
#8 Posted : 26 April 2022 04:23:29(UTC)
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Thankyou all so much,
very mush appreciated!
Offline Jean Giraud  
#9 Posted : 26 April 2022 21:26:53(UTC)
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As given, the duplicate solution is unique wrt the given project variables.
By ranging wisely, you can recursively solve wrt any of the variables involved.
From there, enrich the project document by adding plot(s).
Cheers ... Jean.
Offline overlord  
#10 Posted : 26 April 2022 22:11:11(UTC)
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Originally Posted by: Darcy Go to Quoted Post
Thankyou all so much,
very mush appreciated!

Feel free to ask anything.
Near all users will try to help you for your questions.
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