How to convert this equation to matlab code ?

Dear all,

I need you help to convert this equation to matlab code pls ?

Thank you so much

[William Rose]

@Amir,

What have you tried so far?

How do you plan to deal with the fact that there are two different equations, depending on the value of sigma?

I am asking because you can learn more by making a strong attempt on your own, before geettinghelp from others.

Thereare many variables in this equation. I suggest you make a list of all of them, and of a typical value for each.

Evaluate the equation with Excel or some other tool, to check your work.

Good luck, and please reply with your attempts so far.

[Stephen23]

Original question by Amir retrieved from Google Cache:

https://web.archive.org/web/20220908050521/https://webcache.googleusercontent.com/search?q=cache:AldFfN_mvRYJ:https://www.mathworks.com/matlabcentral/answers/1799175-how-to-convert-this-equation-to-matlab-code

https://web.archive.org/web/20220908050659/https://www.mathworks.com/matlabcentral/answers/1799175-how-to-convert-this-equation-to-matlab-code

How to convert this equation to matlab code ?

Dear all,

I need you help to convert this equation to matlab code pls ?

Thank you so much

[Rena Berman]

(Answers Dev) Restored edit

Answer 1

[Walter Roberson]

syms epsilon_t0_2 E_0 n sigma sigma_0_2 sigma_1_0 n_prime_0_2_1_0
E_0_2 = (sigma_0_2 * E_0)/(sigma_0_2 + 0.002*log(E_0))

E_0_2 = 

part1 = sigma/E_0 + 0.002 * (sigma/sigma_0_2)^n

part1 = 

part2 = (sigma-sigma_0_2)/E_0_2 + (0.008 - (sigma_1_0 - sigma_0_2)/E_0_2) * ((sigma - sigma_0_2)/(sigma_1_0 - sigma_0_2))^n_prime_0_2_1_0 + epsilon_t0_2

part2 = 

eta = piecewise(sigma <= sigma_0_2, part1, part2)

eta = 

[Amir]

Thank u so much mister Robert. I'll check it on matlab

[William Rose]

Impressive answer.