apply 'subs' function first to substitute values for variables in matlab

To substitute values for variables in MATLAB, you can use the 'subs' function. The syntax of the subs function is as follows:

main.m
new_expression = subs(expression, old_variables, new_values)
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where 'expression' is the original mathematical expression, 'old_variables' is a vector of the variables to be substituted, and 'new_values' is a vector of the corresponding values to substitute for the old variables.

Here's an example of using 'subs' function to substitute values for variables in MATLAB:

main.m
syms x y z   % create symbolic variables x, y, and z
expression = x^2 + y^2 + z^2;   % define a mathematical expression
old_variables = [x y z];   % define the variables to be substituted
new_values = [1 2 3];   % define the corresponding values to be substituted
new_expression = subs(expression, old_variables, new_values)   % substitute the values of x, y, and z in the expression
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The output of the above code will be:

main.m
new_expression =

    14
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This means that the new expression after substituting the values of x, y, and z in the original expression is 14.