How can I assign a symbolic expression to symbolic an element of an array

 syms x y u v w
var = [x,y];
sol = [u+w,v-w]

I just started learning MATLAB and I hope someone out there can help me.

How can I assign the symbolic expressions of sol to the elements of var, so that x and y have the values

x = u+w;
y = v-w;

Thanks

Answer 1

[Walter Roberson]

We recommend against that.

http://matlab.wikia.com/wiki/FAQ#How_can_I_create_variables_A1.2C_A2.2C....2CA10_in_a_loop.3F

I suspect you should consider using the single output version of solve(): when there is more than one variable being solved for, it returns a struct or struct array whose fields are named after the variables. You can use that struct as the second input of subs()

   sol = solve(....)
   subs(EXPRESSION, sol)

When you compute a value and think you want to assign it to a a dynamic variable name, then the large majority of the time it is better to subs() instead.

[Felix Albrecht]

Thank you! I will do it that way.

Answer 2

[madhan ravi]

syms x y u v w
var = [x,y];
sol = [u+w,v-w];
disp(var==sol)

[Walter Roberson]

This would display, but not do an assignment.

[madhan ravi]

yes @sir Walter but is it possible to do a symbolic assignment ? because subs() would just replace the variables but not assign

[Walter Roberson]

Doing the assignment would involve all the usual low-quality techniques such as eval()

[Walter Roberson]

For more information about how symbolic variables work, see https://www.mathworks.com/matlabcentral/answers/421188-trouble-converting-syms-for-plotting-plots-not-accepting-values-as-input#comment_615409

[madhan ravi]

crystal clear thank you @sir Walter