Assigning vector values from a variable generated inside for loop matlab

Question

In Matlab I am trying to assign values of a variable generated within a for-loop to an array.

for i=1:4
S = 2*i;
P(i) = S;
end

S is generated within the for loop and all the values it will have are: 2, 4, 6 and 8.

Now I want to assign each of these values of S to an array P such that I want

P(1) = 2, P(2) = 4, P(3) = 6, P(4) = 8

But the for-loop I have included does not work and I have no idea why. First of all it creates a char rather than creating and array. Secondly, none of the values are added and at the end P is empty.

I am not sure why its not working? Does anybody know how to fix this?

Try to first allocate P by P=zeros(4,1);

Photon
– Photon

2015-03-04 10:28:26 +00:00
Commented Mar 4, 2015 at 10:28 — Photon
– Photon, Commented Mar 4, 2015 at 10:28

Daniel · Accepted Answer · 2015-03-04 10:53:55Z

1

You already have a variable P which is a char. Subscript assigning does not change the type of the variable. Delete it using clear P and you get what you want. Alternatively you can overwrite P with zeros as Photon suggested.

This may also be solved without a loop:

P=2.*[1:4]

or:

P=2:2:8

answered Mar 4, 2015 at 10:53

Daniel

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