created June 5, 2001 · complexity basic · author Volker Duetsch · version 5.7
Basic calculations using integers can done within Vim easily by typing (insert-mode):
CTRL-R followed by = then, for example, 2+2 and press Enter.
The result 4 will be inserted into the document.
- Tip 73 Using vim as calculator Built-in integers (this tip).
- Tip 216 Calculate equations from within vim Uses Linux bc.
- Tip 987 Easy floating point arithmetic uses Perl.
- Tip 1070 Inline integer arithmetic only works on integers.
- Tip 1235 Scientific calculator Uses Python.
- Tip 1349 Calculator Editing Uses Linux bc.
- Tip 1359 Calculator and code evaluation using Perl Uses Perl.
Adding the following map to your vimrc
ino <C-A> <C-O>yiW<End>=<C-R>=<C-R>0<CR>
Then, just type 8*8<C-A> you will get 8*8=64
For simple arithmetic, you can often get away with just using repeats of the Ctrl-A (increment) and Ctrl-X (decrement) commands.
For instance, to calculate 453-244, insert the text "453" and then, in Command mode, type 244 and press Ctrl-X (answer: 209).
To calculate 4024+3322, insert the text "4024" and then, in Command mode, type 3322 and press Ctrl-A (answer: 7346).
Passing to the unix utility bc which can do advanced math is very useful. To pipe the current line to bc and replace with it with the result:
To pipe the lines that are currently selected in visual mode to bc and replace with it with the result:
I have a mapping for passing a line to bc:
map gbc yypkA =<Esc>jOscale=2<Esc>:.,+1!bc<CR>kJ
I guess it could be made a bit better. Another useful mapping I once needed was summing numbers on multiple lines:
vmap gs y'>p:'[,']-1s/$/+/\|'[,']+1j!<CR>'[0"wy$:.s§.*§\=w§<CR>'[yyP:.s/./=/g<CR>_j
10 20 30
in a file would result in two new lines: