Question

I would like to insert the output of multiple calculations into my text document:

2**3 = (the result)   
2**4 =         
..   
2**30 =

(** = exponential)
Can anyone help me?

P.S.:
It would be nice to have a kind of immediate scripting in vim without using .vimrc,
just to do quick operations

p.e.
for i in range (3,30)
print "2**".i."=".2**i
endfor

Answer 1

You can write a for...loop like this:

:for i in range(3, 30) | call setline(i-2, printf('2**%d = %d', i, float2nr(pow(2, i)))) | endfor

Another way is to redirect messages to a file:

:redir! >output.txt
:for i in range(3, 30) | echo printf('2**%d = %d', i, float2nr(pow(2, i))) | endfor
:redir END
:e output.txt