Weight data for function

Hi,

I am using chi transform function for DTM.

c = chitransform(S,A);

where S = STREAMobj

and A = flow accumulation

I have generated an output array for c (It is long list of numerical values).

I want to re-run chitransform function 2nd time. But this time, I want to change the A variable to weighted values for snowfall data.

Snowfall data, Z, is an array with numerical values.

This means all the values for A must be weighted, normalised i.e. from 0 to 1, with respect to Z and substituted to chi transform function, c.

What is the easiest way to do this with Matlab code for a beginner?

Thank you.