Updating a value inside for loop

Hi All,

I have a for loop inside which, various operations are running. There are a few variable inside that loop which I want to update after every 4 iterations of the loop.

Lets say we have this situation

a = 1:100

X= X+Y

....

....

Y = 123;

end

I want this Y to update after 4 iterations as in, for a=1:4, the value of Y remains same and for a=5:8, it remains same and so on.

How should I perform this.

Regards

Anum

Answer 1

[David K.]

A common way people do things like this is with an if statement. For the condition of the if statement you need to relate it to a. There is a function called modulus which outputs the remainder of a division between two numbers. This can be used as such:

for a = 1:100
    if(mod(a,4)==0)
        y = updatedY
    end
end

Depending on what you want you may need to change the 4 to a 5.

The way modulus works is that every time a is a multiple of 4 the output will be 0 and so y will be updated.