It depends on what "various weighted statistical calculations" involves. I'd start with two vectors, `x` and `w`. If you really need them to be coupled tightly, you could define an immutable type to hold the value and the weight, but the two separate vectors can be faster for some operations. Also, see:
https://github.com/simonster/StructsOfArrays.jl On Mon, Mar 7, 2016 at 4:50 PM, Christopher Alexander <[email protected]> wrote: > Hello all, I need to create a structure where I keep track of pairs of > value => weight so that I can do various weighted statistical calculations. > > I know that StatsBase has a weights vector, which I plan on using, but the > way that is set up is that it is disassociated from each of the values to > which the weights are to be applied. > > I need the mapping that "Pair" provides, but I've noticed that there is no > easy way, if I have an array of pairs, to grab all the first values or all > the second values (like you can do with a dict in grabbing keys or values). > > I've tried to do something like map(first, my_array_of_pairs), but this is > about 10x slower than if you have a dictionary of value => weight and just > asked for the keys. I actually tried to use a dict at first, but ran into > issues with duplicate values (they were overwriting each other because the > value was the key). > > Any suggestions, or any better way to manipulate an array of Pairs? > > Thanks! > > Chris >
