I can it solve in Mathcad - see please mcdx and pdf files
I try solve it (heat transfer) in SMath - see sm file
Help please
File non trovato.File non trovato.File non trovato.

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I can it solve in Mathcad - see please mcdx and pdf files
I try solve it (heat transfer) in SMath - see sm file
Help please

SMath symbolic solving of integration is not capable as Mathcad.
Thus integrals can't be used with numeric solvers.
However, you can use a little trick to solve them.
Using maple or maxima plugins is the key.
Here is your problem solved with various ways, roots() and Findroot().

Regards

solvewithunits.sm (23,4 KiB) scaricato 1426 volta(e).

Hi. The attached have an al_nleqsol wrapper for a Mathcad block with units, that can accept SMath's integrals too.



Kerimov-Cvetkov-Velichko-1-7 - nSol.sm (17,97 KiB) scaricato 1458 volta(e).

Best regards.
Alvaro.

Actually, you don't need to find Tc2 first hand.
Findroot() can solve with all three equations at once.
All important is the order of unknowns.

Regards

Here is a paper-friendly version.
Also check how variable guess points are assigned.

Regards

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Here is a paper-friendly version.
Also check how variable guess points are assigned.

Regards

Thanks!
Send please the sm file.

Hello Valery,
In some application(s), you can associate FindRoot with epsilon.

Solve Diophantine Chemical Balance epsilon.sm (106,1 KiB) scaricato 1489 volta(e).

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Thanks!
Send please the sm file.

solvewithunits.sm (14,13 KiB) scaricato 1416 volta(e).

Please help, why can't find root for this simple equation?
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root.sm (20,2 KiB) scaricato 1394 volta(e).

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why can't find root for this simple equation?

Because there aren't unknows

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Please help,
why can't find root for this simple equation ?

roots solves wrt scalar function(s)
In this example, both functions are scalar wrt 'x'.
Try ... roots[(sin(x)-Gamma(x),x,1]
'x not defined' ... Gamma(x) is not scalar wrt 'x'
Few more numerical functions are not scalar
erf(x), erf(x,n) ... erfc(x), erfc(x,n) ...

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Try ... roots[(sin(x)-Gamma(x),x,1]

In that case and similar ones,
RootSecant algorithm will spits out 15 decimals, instantaneous.
Cheers ... Jean.

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why can't find root for this simple equation?

Because there aren't unknows

Thanks Davide.
Now I put "N" as unknown in the Eq. But it can't be solved either.


root.sm (19,41 KiB) scaricato 1361 volta(e).

You have to play a little with the precision, especially if there are units involved; in this case, seems that 10^-3 mm is a stable target (10^-2 works too, but in some case it returns the guess value, meaning that is "close enough" for the algorithm - you can see in the plot that 0kN to 200kN is in +0.02/-0.02mm range)



root_r1.sm (24,03 KiB) scaricato 1430 volta(e).