(ddd.info)Plotting Arrays

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7.4.1 Plotting Arrays
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Basically, DDD can plot two types of numerical values:

   * One-dimensional arrays.  These are drawn in a 2-D X/Y space, where
     X denotes the array index, and Y the element value.

   * Two-dimensional arrays.  These are drawn in a 3-D X/Y/Z space,
     where X and Y denote the array indexes, and Z the element value.

   To plot a fixed-size array, select its name by clicking _mouse
button 1_ on an occurrence.  The array name is copied to the argument
field.  By clicking the `Plot' button, a new display is created in the
data window, followed by a new top-level window containing the value
plot.

   To plot a dynamically sized array, you must use an array slice
(Note: Array Slices).  In the argument field, enter

     ARRAY[FIRST]@NELEMS

where ARRAY is the name of the array to display, FIRST is the index of
the first element, and NELEMS is the number of elements to display.
Then, click on `Plot' to start the plot.

   To plot a value, you can also enter a command at the debugger prompt:

     graph plot EXPR

works like `graph display EXPR' (and takes the same arguments; Note:
Creating Single Displays), but the value is additionally shown in the
plot window.

   Each time the value changes during program execution, the plot is
updated to reflect the current values.  The plot window remains active
until you close it (via `File => Close') or until the associated
display is deleted.