Taking values from a Matrix and Inputting into an equation, using Loops

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RS
RS on 23 Jul 2020
Commented: Serhii Tetora on 23 Jul 2020
Hello.
I have a matrix say: A = [1 2 3 4 5 6 7] and an eqaution y = x^2
I need to find a way to take each value of the matrix and input it into y in an automated way, say using For loops. I am also trying to do this by not making the resulting values of y as a matrix i.e. I just want the answer y gives for each value taken from a to be stored as a number and not a matrix.
I am a relative beginner to MATLAB and have no idea how to do this.
Any help greatly appreciated.

Accepted Answer

Serhii Tetora
Serhii Tetora on 23 Jul 2020
A = [1 2 3 4 5 6 7];
for i = 1:length(A)
x = A(i);
y(i) = x^2;
end
y
  2 Comments
Serhii Tetora
Serhii Tetora on 23 Jul 2020
A = [1 2 3 4 5 6 7];
for i = 1:length(A)
x = A(i);
y(i) = x^2;
eval(sprintf('Ans%d = y(i)',i))
end

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More Answers (1)

William Alberg
William Alberg on 23 Jul 2020
Hello Omar
If you want to replace "y" with one of the values in "A", you can do it the following way:
A = 1:7;
syms x y
eq = y == x^2;
for i = 1:length(A)
eq_temp = subs(eq, y, A(i))
end
If you want to calculate y, i would recommed doing it the following way, where "y = f(x)":
f(x) = x^2;
for i = 1:length(A)
val_temp = f(A(i))
end
  1 Comment
William Alberg
William Alberg on 23 Jul 2020
I did not see Serhii's repley.
I also misunderstood, i thought you wanted the equation to be in symbolic format.

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