Re: st: creating/manipulating matrices with nested loop

[Sergiy Radyakin <serjradyakin@gmail.com>]

One way to approach this kind of problems is to "unwind the loop". It
is typically used for performance optimizations, but can be used for
designing the looping program too if turned backwards.

Consider the following example. You seek something like:

for i=1 to 5
   print i
next i

instead you first write

print 1
print 2
print 3
print 4
print 5

and make sure you are getting the desired result (variable Var3 is all
populated with desired values)

Then you look at what changes and what can be looped. Define the
iteration blocks and parametrize them with the loop index. So start
with 2 countries and 2 years and write down everything without any
loops. Use Ctrl+C/Ctrl+V if necessary.

As for the specifics of your task, if you have M countries, (and
suppose only 1 year), you will have M(M-1) (M times M-1) results that
you would want to put to Var3, but you will only have M values there.
So how do you want the results to be stored?