Mathcad to SMath_function root and solve

#1 Posted: 3/26/2021 6:59:33 AM

0 likes in 5 posts.

Group: User

Hi,

can someone help me to copy this mathcad code in a SMath's one?
I have some problems with the solution of Xn

Thank you

File not found.File not found.

#2 Posted: 3/26/2021 10:09:07 AM

matteo

0 likes in 5 posts.

Group: User

ok,

thanks

verifica a flessione_prova.sm (43 KiB) downloaded 39 time(s).

#3 Posted: 3/26/2021 12:52:12 PM

Alvaro Diaz Falconi

992 likes in 1674 posts.

Group: User

Wrote
Hi,

can someone help me to copy this mathcad code in a SMath's one?
I have some problems with the solution of Xn

Thank you

Hi. sigma.c fucntion is defined with an if clause. SMath can't integrate it, but you can use cases():

Now you can integrate:

Best regards.
Alvaro.

#4 Posted: 3/30/2021 4:10:19 AM

matteo

0 likes in 5 posts.

Group: User

Thanks Alvaro.
I made your correction, using the function cases(), but I have the same problem if I add other terms to fb(xn), for example if I add Ast*sigma sb(eps) and Asc*sigmasb(eps).

How is it possible?

Thanksverifica a flessione_prova2.sm (43 KiB) downloaded 34 time(s).

#5 Posted: 3/30/2021 6:37:01 AM

fedeghi

25 likes in 112 posts.

Group: User

Possibly an odd bracket problem?

Here appears that Smath is making a group of "y+sigma bla bla" as object for the differential operator
So, fb(x) could not be evaluated.

I placed some brackets to clearly separate "y" from what follows in the equation, see picture below.
It appears that with brackets, fb(x) can be evaluated (but I get an error on units).
Maybe some other formula needs to be checked before?

Ciao!

#6 Posted: 3/30/2021 6:54:56 AM

fedeghi

25 likes in 112 posts.

Group: User

Splitted the equation in three contributions, it appears the the integral is not consistent with other two terms of the sum
I think calculation should work, once you clear the unit issue which is hidden somewhere in other parts of the calculation.

Ciao

#7 Posted: 3/30/2021 8:03:34 AM

overlord

552 likes in 1332 posts.

Group: Moderator

I am pretty sure my units mismatch correction is not suitable.
You should have to check this issue by yourself.
But I had managed to solve your function problem.
Rewriting it make function tick again.

Regards

verifica a flessione_prova2_rev.sm (45 KiB) downloaded 38 time(s).

#8 Posted: 4/3/2021 8:06:31 AM

Davide Carpi

1416 likes in 2873 posts.

Group: Moderator

I've had this pending in background so I'll share the solution even here. Aside the initial issues about if() and units, the integral fails when x_n is set as 0, since epsilon is something/0. Therefore solve range must exclude 0 or the function has to handle it.

Happy Easter and take care, anyone.

If you like my plugins please consider to support the program buying a license; for personal contributions to me: paypal.me/dcprojects

#9 Posted: 4/3/2021 6:45:13 PM

Jean Giraud

983 likes in 6866 posts.

Group: User

Wrote
Happy Easter and take care, anyone.

Thanks Davide ... Your's all too ... Jean

SMath Forum

Mathcad to SMath_function root and solve - Messages