Hi @David Pham
You can assign values to a set of symbolic variables like "x1", "x2", ..., "xn" using symbolic toolbox. The best way is to create a symbolic vector and then substitute the values using the "subs" function.
Here’s how you can do it step-by-step:
syms x [1 n] % creates symbolic variables x1, x2, ..., xn as a vector
% Suppose s is your 1-by-n matrix of values
s = [value1, value2, ..., valuen]; % replace with your actual values
% Now substitute each xi with the corresponding value in s
expr = x; % or any symbolic expression involving x
expr_substituted = subs(expr, x, s);
% expr_substituted now has each xi replaced by s(i)
If you want to assign values individually (though not usually necessary), you could do:
for i = 1:n
assignin('base', sprintf('x%d', i), s(i))
end
But the preferred symbolic approach is using "subs".
Example:
n = 3;
syms x [1 n]
s = [10, 20, 30];
expr = x(1)^2 + x(2)*x(3);
expr_substituted = subs(expr, x, s);
disp(expr_substituted) % Output: 10^2 + 20*30 = 100 + 600 = 700
Hope this helps!
