how to use "For" cycles for ranges of 2D arrays

Hello,

I have the following code:

D11=A1(1:1000,:)
D12=A1(1:2000,:)
D13=A1(1:3000,:)
D14=A1(1:4000,:)
D21=B1(1:1000,:)
D22=B1(1:2000,:)
D23=B1(1:3000,:)
D24=B1(1:4000,:)
D31=C1(1:1000,:)
D32=C1(1:2000,:)
D33=C1(1:3000,:)
D34=C1(1:4000,:)

I would like to fill new variables with a certain range of other 2D arrays. I know it's much better to use a "For" cycle, but I don't know how to do it properly with ranges. I kindly ask your help.

I thank you in advance,

Best regards,

[Jan]

It is not clear to me, what the inputs are and what you want to solve with the loop.

But hiding indices in thenames of variables is a shot in your knee. Use D{1,1}, D{1,2}, ... instead. The same for A1,B1,C1. As soon as you use arrays and indices, it is easy to call this inside loops.