Generating a column of increasing numbers
From Vim Tips Wiki
created 2001 · complexity intermediate · author Charles E. Campbell, Jr. · version 6.0
You can use the Visual Incrementing script to convert a block of numbers selected via Ctrl-v (visual block) into a column of increasing integers. Select the column then enter
:I to replace the selection. The first line's number is used as a starting value, and the number in each subsequent line is incremented by one.
If the Ctrl-v block is "ragged right", which can happen when "$" is used to select the right hand side, the block will have spaces appended as needed to straighten it out. If the strlen of the count exceeds the visual-block allotment of spaces, then additional spaces will be inserted.
Example: Put cursor on topmost zero, select column with Ctrl-v, then enter
vector = 1; vector = 1; vector = 1; vector = 1; vector = 1; --> vector = 1; vector = 1; vector = 1; vector = 1; vector = 1;
 See also
The vis.vim script at Visual Block Commands can apply a substitute to a visual-block.
:I<CR> will use the first line's number as a starting point, incrementing by 1 :I #<CR> like :I, but will increment by given number; negative numbers work fine :II<CR> will pad on left as needed, otherwise like :I :II #<CR> like :II, but will increment by given number
An additional script, calutil.vim, adds some calendrical date to/from Julian day conversion functions. With those, visincr.vim now has new commands:
IMDY [incr]: make a column of month/day/year dates
IYMD [incr]: make a column of year/month/day dates
IDMY [incr]: make a column of day/month/year dates
ID [incr]: make a column of day names
The optional incr (default value is 1) can be positive or negative. Both scripts are available at Vim Functions.