Making a plot disappear

[Mark Jurik <mark@xxxxxxxxxxxx>]

Once upon a time I knew of a "secret" incantation that would make a plot 
not appear for any specified bar AND when the plot reappears, the chart 
does not attempt to connect-the-dots with a straight line across the blank 
region.  It went something like this...

if condition1
   then plot1( mystery_value_that_I_forgot, "" )    {this should not plot }
   else plot1( close, "" ) ;

Anybody know?

- mark