Multiplying each value of a vector with the corresponding value in another vector?

I have 4 vectors E,A,alpha,temp (each 21x1)

I want to carry out the following equation:

theta = E*A*alpha*temp [-1 ;1]

and theta be a vector where the first value is: theta(1) = E(1)*A(1)*alpha(1)*temp(1) * [-1;1]

and theta(n) = E(n)*A(n)*alpha(n)*temp(n) * [-1;1] etc.

Do I use for loop, how would I got about this?

Thank you in advance.

Answer 1

[Star Strider]

Use element-wise multiplication. If all the other vectors are column vectors, the [-1 1] vector must be a row vector:

theta = E.*A.*alpha.*temp*[-1 1]

See Array vs. Matrix Operations for an explanation.

[Finn Farnan]

This worked, Thank you!

[Star Strider]

As always, my pleasure!

Answer 2

[Matt J]

theta = (E.*A.*alpha.*temp.*[-1 ,1]).'

Answer 3

[Setsuna Yuuki.]

with loop for

for n = 1:length(E)
theta(:,n) = E(n)*A(n)*alpha(n)*temp(n) * [-1;1] 
end

or can be:

theta(n) = E.*A.*alpha.*temp(n).*[-1;1] 

[Finn Farnan]

Thank you for your response.

I have tried this solution and get "Unable to perform assignment because the left and right sides have a different number of elements."

Any ideas?

[Setsuna Yuuki.]

My error in the code:

theta(n) = E.*A.*alpha.*temp(n).*[-1;1] 
%is 
theta= E.*A.*alpha.*temp.*[-1;1] 

loop:

theta(:,n) = ...