How to simplify code with multiple variable names?

For example, a code like this:

ma1 = trapz(ea1(r1:ir1),ty(r1:ir1));
ma2 = trapz(ea2(r2:ir2),ty(r2:ir2));
ma3 = trapz(ea3(r3:ir3),ty(r3:ir3));
ma4 = trapz(ea4(r4:ir4),ty(r4:ir4));
ma5 = trapz(ea5(r5:ir5),ty(r5:ir5));

But, if I have even more variables, then is there a shortcut or simpler method to syntax them?

[dpb]

Yeah, don't create the sequentially-numbered arrays ea, r and ir in the first place.

What specifically should use instead will depend upon where they're coming from, but since each ea is being addressed as a vector, then simply storing ea as a 2D array might work if they're different variables at each and there are the same number of observations for each.

Are the X spacings (ea) nonuniform one must presume for each?

Are the number of elements in each subset the same?

So many questions, so little detaill...

[Stephen23]

"How to simplify code with multiple variable names?"

By using arrays rather than multiple variable names.

Answer 1

[Jon]

You can use arrays to hold your data. So one approach would be to use arrays:

ma - n by 1

ea - k by n

r - n by 1

ir n by 1

then you could loop through the values

n = 5;
ma = zeros(n,1);
for i = 1:n
    ma(i) = trapz(ea(r(i):ir(i),i),ty(r(i):ir(i)));
end

[cjnavee]

Thank you!

[dpb]

NB: that trapz is internally vectorized to operate by columns -- if you can arrange your subsections appropriately, you may well be able to take advantage of that -- why I asked about the details...