Procs

proc diffs[T](src: seq[T]; stride = 1): seq[T]: Batch first differences of random-access src (vectorizable). Source Edit

Iterators

iterator diffs[T](src: iterator (): T; stride = 1): T: First differences Source Edit
iterator diffs2[T](src: iterator (): T; stride = 1): T: Second differences Source Edit
iterator kWayMerge[T](itrs: openArray[iterator (): T]): T: k-way merge of ordered itrs[i] yields using std/heapqueue. Source Edit
iterator ratios[T](src: iterator (): T; stride = 1): T: First ratios Source Edit
iterator returns[T](src: iterator (): T; stride = 1): T: Arithmetic returns (of, e.g. prices) Source Edit
iterator succPairs[T](src: iterator (): T; stride = 1): (T, T): Yield successive pairs (srci - stride, srci) for all valid i Source Edit