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(gnuplot.info)if

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 The `if` command allows commands to be executed conditionally.

 Syntax:
       if (<condition>) <command-line>

 <condition> will be evaluated.  If it is true (non-zero), then the command(s)
 of the <command-line> will be executed.  If <condition> is false (zero), then
 the entire <command-line> is ignored.  Note that use of `;` to allow multiple
 commands on the same line will _not_ end the conditionalized commands.

 Examples:
       pi=3
       if (pi!=acos(-1)) print "?Fixing pi!"; pi=acos(-1); print pi
 will display:
       ?Fixing pi!
       3.14159265358979
 but
       if (1==2) print "Never see this"; print "Or this either"
 will not display anything.

 See `reread` (Note: reread ) for an example of how if and reread can be used
 together to perform a loop.