(ddd.info)Animating Plots

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7.4.8 Animating Plots
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If you want to see how your data evolves in time, you can set a
breakpoint whose command sequence ends in a `cont' command (Note:
Breakpoint Commands.  Each time this "continue" breakpoint is
reached, the program stops and DDD updates the displayed values,
including the plots.  Then, DDD executes the breakpoint command
sequence, resuming execution.

   This way, you can set a "continue" breakpoint at some decisive point
within an array-processing algorithm and have DDD display the progress
graphically.  When your program has stopped for good, you can use
`Undo' and `Redo' to redisplay and examine previous program states.
Note: Undoing Program Execution, for details.