looping with for through variables with multiple columns

Hi all!

I have 33 variables with multiple columns.. Does anyone knows how would be the statement in for loop?

sza = ["20_0","50_0","80_0"];
tau = ["0_0","0_5","1_0","1_5","2_0","3_0","4_0","5_0","10_0","15_0","20_0"];

for i=1:length(sza)
    for j=1:length(tau)
        statement
    end
end

statement for just one double array: X20_0sza0_0tau(:,8) = (X20_0sza0_0tau(:,5) + X20_0sza0_0tau(:,6)).*4*pi;

[Stephen23]

X20_0sza0_0tau(:,8) = ...

It looks like you are putting meta-data into variable names. Meta-data is data, and should NOT be in variable names.

Accessing (meta-)data in variable names is one way that beginners force themselves into writing slow, complex, obfuscated, buggy code that is hard to debug. Read this to know why:

https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

Most likely you should be using one array (e.g. numeric, structure, table, etc.) and accessing the data in that array.