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  1: Introduction
  2: Simple example
  3: Invocation
  4: Finer Control
  5: X-Y Plots
  6: Contour Plots
  7: Image Plots
  8: Examples
  9: Gri Commands
  10: Programming
  11: Environment
  12: Emacs Mode
  13: History
  14: Installation
  15: Gri Bugs
  16: Test Suite
  17: Gri in Press
  18: Acknowledgments
  19: License

index.html#Top HandlingData.html#HandlingData Gri: column algebra Gri: plotting several columns index.html#Top Gri: plotting several columns

8.12.4: Combining columns from different files

Suppose you want to plot a column (`y', say) from one file versus a second column (`x') from a second data file. The easy way is to use a system command to create a new file, for example the Unix command `paste' -- but of course you don't want to clutter your filesystem with such files, so you should do this withing Gri:

open "paste file1 file2 |"
read columns x y
draw curve

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