Full Command and Function Reference 3-47
If EQ contains a list, the initial value problem is solved and plotted using a combination of
Rosenbrock (3,4) and Runge-Kutta-Fehlberg (4,5) methods. In this case DIFFEQ uses
RRKSTEP to calculate y
f
, and EQ must contain two additional elements:
• The second element of EQ must evaluate to the partial derivative of Y' with respect to X,
and can return a real value or real vector when evaluated.
• The third element of EQ must evaluate to the partial derivative of Y' with respect to Y, and
can return a real value or a real matrix when evaluated.
Access: …µ
DIFFEQ
Input/Output: None
See also: AXES, CONIC, FUNCTION, PARAMETRIC, POLAR, RKFSTEP, RRKSTEP, TRUTH
DIR
Type: Function
Description: Creates an empty directory structure in run mode. Can be used as an alternative to CRDIR to
create an empty directory by typing DIR ‘NAME’ STO, which will create an empty directory
‘NAME’ if it does not already exist in the current directory.
Access: …µDIR
Input/Output:
Level 1/Argument 1 Level 1/Item 1
→
DIR …END
See also: CRDIR
DISP
Type: Command
Description: Display Command: Displays obj in the nth display line.
n ≤ 1 indicates the top line of the display.
To facilitate the display of messages, strings are displayed without the surrounding " " delimiters.
All other objects are displayed in the same form as would be used if the object were in level 1 in
the multiline display format. If the object display requires more than one display line, the display
starts in line n, and continues down the display either to the end of the object or the bottom of
the display. The object displayed by DISP persists in the display only until the keyboard is ready
for input. The FREEZE command can be used to cause the object to persist in the display until
a key is pressed.
Access: !°L
OUT DISP ( °is the left-shift of the Nkey).
Input/Output:
Level 2/Argument 1 Level 1/Argument 2 Level 1/Item 1
obj n
→
See also: DISPXY, FREEZE, HALT, INPUT, PROMPT
DISPXY
Type: Command
Description: Display Command: Displays obj at the specified screen coordinates using a specified font size.
The list argument expects exactly two binary integers to specify the X and Y coordinates. The
level one integer argument
n will display the obj using a small font if n is 1 and using the system
font if n is 2.
To facilitate the display of messages, strings are displayed without the surrounding " " delimiters.
All other objects are displayed in the same form as would be used if the object were in level 1 in
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