README file for NUMDIFF utility
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Purpose
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  Diff files with numerical content. Allow to specify per-numeric constraints
  - absolute, relative and content-specific relative accuracies - in an easy way.
  Content other than numerics are strictly compared characters by characters.

  Numdiff can diff ~100MB of data per second with hundred constraints on a
  decent laptop.

Usage
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Config examples
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Config syntax
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Comments:
- line: # or !

Statements:

# row col eps-command
*       *  dig=1
10-100  *  rel=1e-7 abs=1e-12

Rows and columns selections:

- all:      *     (shortcut for 1-$)
- last:     $
- single:   num
- range:    num-num       (beg-end, end included)
- range_s:  num-num/num   (beg-end/step)
- slice:    num:num       (beg:len, beg+len not included)
- slice_s:  num:num/num   (beg:len/step, beg+len*step not included)

Commands:

- dig=eps
- rel=eps
- abs=eps
- equ
- ign
- skip