How can I convert symbolic function into non symbolic function.

Hi. I am trying to make a GUI algorithm and just realize that syms (from the symbolic toolbox) is not working for the compiler.

Is there any way I can use another command or change function into non-symbolic function?

My function has the following form.

syms A E B
diff_A = diff(exp(-(pre/(exp(A)*exp(E./(k*(273.16+normal_stress)))))^B),A);
A=x(1)

Answer 1

[Star Strider]

Use the matlabFunction function:

syms A E B pre k normal_stress
diff_A = diff(exp(-(pre/(exp(A)*exp(E./(k*(273.16+normal_stress)))))^B),A);

diff_A_fcn = matlabFunction(diff_A)

to get:

diff_A_fcn =

    function_handle with value:

      @(A,B,E,k,normal_stress,pre)B.*pre.*exp(-E./(k.*(normal_stress+2.7316e2))).*exp(-A).*exp(-(pre.*exp(-E./(k.*(normal_stress+2.7316e2))).*exp(-A)).^B).*(pre.*exp(-E./(k.*(normal_stress+2.7316e2))).*exp(-A)).^(B-1.0)

[ChinUk]

Thank you for the answer. I will try to apply it.

[Star Strider]

As always, my pleasure.

You will find it easier to use as:

diff_A_fcn =  @(A,B,E,k,normal_stress,pre) B.*pre.*exp(-E./(k.*(normal_stress+2.7316e2))).*exp(-A).*exp(-(pre.*exp(-E./(k.*(normal_stress+2.7316e2))).*exp(-A)).^B).*(pre.*exp(-E./(k.*(normal_stress+2.7316e2))).*exp(-A)).^(B-1.0);

Answer 2

[KSSV]

How about using anonymous function?

diff_A = @(A,B,E) diff([exp(-(pre/(exp(A)*exp(E./(k*(273.16+normal_stress)))))^B),A]);

[ChinUk]

Thank you for your help. I really appreciate it.

[ChinUk]

Thank for your answer, just a little quick question.

As you see, I try to make differential function without using the syms command.

and how can I replace 'eval' command? deval function is not so useful.

the full function had the following format.

diff_A = diff(exp(-(pre/(exp(A)*exp(E./(k*(273.16+normal_stress)))))^B),A);

diff_E = diff(exp(-(pre/(exp(A)*exp(E./(k*(273.16+normal_stress)))))^B),E);

diff_B = diff(exp(-(pre/(exp(A)*exp(E./(k*(273.16+normal_stress)))))^B),B); A=x(1); E=x(2); B=x(3);

g = [eval(diff_A) eval(diff_E) eval(diff_B)];