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 not found.File not found.File not found.

Wrote

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 KiB) downloaded 46 time(s).

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 KiB) downloaded 52 time(s).

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

Wrote

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 KiB) downloaded 37 time(s).

Wrote

Thanks!
Send please the sm file.

solvewithunits.sm (14 KiB) downloaded 41 time(s).

Please help, why can't find root for this simple equation?
File not found.File not found.
root.sm (20 KiB) downloaded 30 time(s).

Wrote

why can't find root for this simple equation?

Because there aren't unknows

Wrote

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) ...

Wrote

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

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

Wrote

Wrote

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 KiB) downloaded 25 time(s).

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 KiB) downloaded 29 time(s).