Hello again. I'm really expecting 200 rows to be compared.
In fortran i did 2 nested cycles and i put a conditional to do that.
that is a kind of:
for 10 i=1,nrows
for 20 j=1, nrows-1
distance(i,j)= square(x**2+y**2+z**2)
if (distance(i,j).LE.VALUE) then
print (*,30) value
20 continue
30...