array showing fixed value when inputting a waveform

[RichardLXL]

I'm trying to calculate the phase between voltage and current, but first i have to work out power and do it from there. So i'm inputting the power data into an array but the array data doesn't change through out the whole session of for loop. I'm not sure what is happening.

[LucianM]

If you talk about the array in shift registers it's beacause you're replacing the array with same data at each iteration.

[RichardLXL]

so the function replacing array subset does not add new data to the array?

[LucianM]

No, as the name of the function says, it replaces a subset of the input array.