Iteration of 2 datasets (raster calculator)

Fra_AngelicoViray

Good day!

I am having a problem setting up a model builder. I have 2 raster datasets (qx,qy) that are needed to be iterated as input for the raster calculation tool. The number of files of qx and qy is 243 each. The expression for the raster calculator is as follows:

SquareRoot(Square("%qx%")+Square("%qy%"))   with terms:

qx1 and qy1
qx2 and qy2

.... qxn and qyn.

My initial setup is as follows (since you can only use 1 iterator in a model): 

For this trial, I only used 5 rasters both for qx and qy. The model actually ran the calculation but the terms used were not correct. Please see below:

qy1 and qx5

qy2 and qx5

qy3 and qx5

qy4 and qx5

qy5 and qx5

Qy (iteration in the main model) was correctly iterated but not in the case of Qx. I hope you can help me with this problem. Thank you!

curtvprice

This is how loops work. If you want to operate on pairs you need to only do one iterator on qx and somehow create the path to qy from qx. No nesting needed.

In python scripts you can easily loop over a list of 2 item lists, but this isn't easily accomplished in ModelBuilder.