Easy floating point arithmetic

==Comments==
Or you could use <code>:perldo</code> instead of shelling out.

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The bccalc {{script|id=219}} and EvalSelection {{script|id=889}} plugins serve a similar purpose.

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The last one seems wrong. Both on Windows and on Linux I saw the expression replaced by "XXXXX...".

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I found the problem with the last one: it does work with there is only one line in the buffer. This works (assuming `calcu <expr>' is something to calculate the expression:

<pre>
vnoremap <silent> <Leader>mr "aygvrXgv"by:r !calcu <C-R>a<CR>km`j0"cyWdd``:s/<C-R>b/<C-R>c/<CR>$
</pre>

For other three, I am now using a simpler form:

<pre>
nnoremap <silent> <Leader>ma yypV:!calcu <C-R>"<CR>k$
vnoremap <silent> <Leader>ma yo<Esc>pV:!calcu <C-R>"<CR>k$
nnoremap <silent> <Leader>mr yyV:!calcu <C-R>"<CR>$
</pre>

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I really worry about the replacement trick in the last mapping, so I worked out a safer version (using marking and jumping):

<pre>
vnoremap <silent> <Leader>mr ygvmaomb:r !calcu <C-R>"<CR>"ay$dd`bv`a"ap$
</pre>

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In addition to bccalc and EvalSelection, there are VimCalc (requires Python) {{script|id=3329}} and Crunch (pure VimL) {{script|id=4686}}. Taking in account these plugins, maybe tips [[VimTip1235|Tip 1235 Scientific calculator]] and [[VimTip73|Tip 73 Using vim as calculator]] could be merge with this.

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