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I can resize horizontal split windows by ctrl-w-shift-< and ctrl-w-shift->. I would like to have a shortcut for that.
Close to the topic, recently I learned about the following maps:
nnoremap <C-j> <C-w>j
nnoremap <C-k> <C-w>k
nnoremap <C-h> <C-w>h
nnoremap <C-l> <C-w>l
So I tried:
nnoremap <C-\<> <C-w>\<
nnoremap <C-\>> <C-w>\>
But it seems not to be working.
While waiting for an answer I'm using @john-mo mouse approach from How do I change the current split's width and height?
Your mappings have two problems:
One problem can be solved easily: you don't need to escape < and > in the right-hand part of the mappings, for example, these ones work properly:
nnoremap <C-a> <C-w>>
nnoremap <C-b> <C-w><
Your second problem, which can't really be solved is that you're trying to map Ctrl + <, which is not possible. So you should try to use another key combination. (I already wrote an answer about how to debug a mapping which could have been useful to you in this case: How to debug a mapping?)
While you can't use Ctrl+< and Ctrl+>, many terminals will support alt+, (comma) and alt+. (period), although it's not obvious at first how to do this:
execute "set <a-,>=\<esc>,"
execute "set <a-.>=\<esc>."
nnoremap <silent> <a-,> :<c-u>vert res -<c-r>=v:count?v:count1:5<cr><cr>
nnoremap <silent> <a-.> :<c-u>vert res +<c-r>=v:count?v:count1:5<cr><cr>
You can supply a count or use the default of 5.
With alt maps I recommend using
set ttimeout ttimeoutlen=10
otherwise there can be a delay when pressing esc as vim waits to see if a , or . is coming.
