Gri: `new' command

Gri Commands 1: Introduction 2: Simple example 3: Fancy example 4: Running Gri 5: Programming Gri 6: General Issues 7: X-Y Plots 8: Contour Plots 9: Image Plots 10: Examples 11: Handling Data 12: Gri Commands 13: Gri Extras 14: Evolution of Gri 15: Installing Gri 16: Gri Bugs 17: System Tools 18: Acknowledgments 19: License 20: Newsgroup 21: Concept Index | ## 12.25: The ``new`' Command
    new .variable_name. | \synonym_name \
      [.variable_name. | \synonym_name \
        [...]]
Set aside storage for new version of the named variable(s) and/or synonym(s). Any number of variables and synonyms may be specified. If a given variable/synonym already exists, this will create a new version of it, and future assignments will be stored in this new version without affecting the pre-existing version. If the variable/synonym is ``delete`'ed, the new version is deleted, making the old, unaltered, version accessible again. This command is used mostly for temporary use, to prevent clashing with existing values. Suppose you want to change the font size inside a new command or an if block. Then you might do the following, where the variable ``.tmp.`' is used to store the old font size. Note that the use of the ``new/delete`' statements prevents the assignment to the local version of the variable ``.tmp.`' from affecting the value known outside the ``if`' block, if in fact ``.tmp.`' happened to exist outside the block.
    set font size 10
    draw label "This is in fontsize 10" at 10 2 cm
    if .want_title.
      new .tmp.
      .tmp. = ..fontsize..
      set font size 22
      draw label "This is 22 font" at 10 5 cm
      set font size .tmp.
      delete .tmp.
    end if
    draw label "This is 10 font" at 10 8 cm