[D]Practical correlation metric for a large number of vectors

I am dealing with a timeseries consisting of input flow sampled every 5 minutes over 441 days. My aim is to find any possible correlation from data coming from:

1. The same day of the week
2. The same moment in time

I proceeded to sample according to weekdays and hours. Then I computed the 63x63 correlation matrix for each of the weekdays and a 441x441 for each hour, which in the second case is pretty impractical. I feel like …

correlation machinelearning