How can I use a loop to input different arrays into the same equation so I do not have to repeat code?

I am trying to multipy three different arrays by 3 but I do not want to simply multiply them each by three, so is there a way I can use a for or loop function to do the multiplication for me for all three arrays?

Answer 1

[SHIVAM KUMAR]

Don't know why you want to use a loop for that .

for i=1:3
    Arr[i,:]=Arr[i,:]*3; %That's only useful if you have a vector. 
                        % For arrays its not much useful to do in a loop.
end

[SHIVAM KUMAR]

assuming your all 3 arrays are 3 rows of the vector Arr.

[ETHAN FROHNA]

Sorry if that was confusing, this is what I am trying to accomplish:

A=[1 2 3 4]
B=[5 6 7 8]
C=[9 10 11 12]

So I am trying to multiply the three of these by without have to write

A*3
B*3
C*3

I am doing a much more complex problem for a homework but I want to know if there is a basic functions to multiplty them all by three at once.

[Stephen Cobeldick]

"...but I want to know if there is a basic functions to multiplty them all by three at once."

If you really want to multiply them "at once" then simply put all of the data into one numeric array (which could be a 3D array) and perform one multiplication.

If you want to keep them as separate arrays then simply store them all in one cell array (which they should be anyway) and use a basic loop:

C = {[1,2,3,4],[5,6,7,8],[9,10,11,12]};
for k = 1:numel(C)
    C{k}*3
end

Defining the arrays in lots of separate variables is a mistake that will force you into writing slow, complex, inefficient, obfuscated, buggy code that is hard to debug. Indexing is much simpler and much more efficient.

Answer 2

[SHIVAM KUMAR]

You can make A as a vector

A=[[1 2 3 4];[5 6 7 8];[9 10 11 12]];
A=A*3;

To use A or B or C we can use

A(1,:) %To use as A
A(2,:)%can be used as B
A(3,:)%Will work like C

[SHIVAM KUMAR]

This can multiply them all at once. Just you have to be a bit careful in use.