Chapters: 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 Indices: Concepts Commands Variables | ### 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