I am porting someone else’s MATLAB code and found an indexing pattern that was baked in rather than generated programmatically. After hacking at it for a bit I managed to generalize the pattern. My solution isn’t very pretty or clever, nor is it a function that demands performance optimization. However, I am always curious to see demos of good idiomatic Julia.
So…for those that want to try solving it, here is an example of the pattern when
N = 13:
index1=[ 1,1,1,1,1,1,1,1,1,1,1,1,1,2,3,4,5,6,7,8,9,10,11,12,13,13,13,13,13,13,13,13,13, 13,13,13,13,12,11,10,9,8,7,6,5,4,3,2,2,2,2,2,2,2,2,2,2,2,2,3,4,5,6,7,8,9,10,11, 12,12,12,12,12,12,12,12,12,12,12,11,10,9,8,7,6,5,4,3,3,3,3,3,3,3,3,3,3,4,5,6,7, 8,9,10,11,11,11,11,11,11,11,11,11,10,9,8,7,6,5,4,4,4,4,4,4,4,4,5,6,7,8,9,10,10, 10,10,10,10,10,9,8,7,6,5,5,5,5,5,5,6,7,8,9,9,9,9,9,8,7,6,6,6,6,7,8,8,8,7,7]
I have a gist here with my own MWE of a working solution. You can either look at the gist and try to improve it, or, for bonus difficulty ignore the gist and just use the unrolled vector as a reference.