Symbolic evaluation with value

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Bert
Bert 2022-11-22
编辑： Rishav 2023-9-5
In a lecture I had my tutor showed us how to evalute a symbolic equation that he had made but with a value for the symbolic variable (just 1 symbolic variable in the equation), he then put it into a graph to display but the original equation was in symbolic form. Does anyone know what that function is as I can't find it for the life of me. It wasn't subs, also looking for this specific function as its relative to my current equation.
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Torsten
Torsten 2022-11-22
To substitute numerical values for symbolic variables, use "subs".
To transform a symbolic function to a numeric function handle, use "MatlabFunction".

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Rishav
Rishav 2023-9-4
编辑：Rishav 2023-9-5
Hi Bert,
  • "subs" is used to substitute numerical values for symbolic variables.
Here is an example on how to use 'subs':
% Define a symbolic variable x
syms x;
% Define a symbolic equation
eq = x^3 + 4*x + 1;
% Substitute a specific value for x
x_value = 2;
result = subs(eq, x, x_value);
% Display the result
disp(result);
  • "matlabFunction" is used to transform a symbolic function to a numeric function handle.
Here is an example on how to use 'matlabFunction':
% Define symbolic variables
syms x y;
% Define a symbolic expression
f = x^2 + y^2;
% Create a numeric function handle
numeric_function = matlabFunction(f, 'Vars', [x, y]);
% Now you can use the numeric_function to evaluate the expression numerically
x_value = 3;
y_value = 4;
result = numeric_function(x_value, y_value);
% Display the result
disp(result);

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