Reference Guide

3-260 Full Command and Function Reference
• indep is a name specifying the independent variable on the horizontal axis, or a list containing
such a name and two numbers specifying the minimum and maximum values for the
independent variable (the horizontal plotting range). The default value is X.
• res is a real number specifying the interval (in user-unit coordinates) between plotted values of
the independent variable on the horizontal axis, or a binary integer specifying that interval in
pixels. The default value is 0, which specifies an interval of 1 pixel.
• axes is a list containing one or more of the following, in the order listed: a complex number
specifying the user-unit coordinates of the plot origin, a list specifying the tick-mark annotation,
and two strings specifying labels for the horizontal and vertical axes. The default value is (0,0).
• ptype is a command name specifying the plot type. Executing the command TRUTH places the
name TRUTH in ptype.
• depend is a name specifying the independent variable on the vertical axis, or a list containing such
a name and two numbers specifying the minimum and maximum values for the independent
variable on the vertical axis (the vertical plotting range). The default value is Y.
The contents of EQ must be an expression or program, and cannot be an equation. It is evaluated
for each pixel in the plot region. The minimum and maximum values of the independent variables
(the plotting ranges) can be specified in indep and depend; otherwise, the values in (x
min
, y
min
) and
(x
max
, y
max
)(the display range) are used. The result of each evaluation must be a real number. If the
result is zero, the state of the pixel is unchanged. If the result is nonzero, the pixel is turned on
(made dark).
Access: …µ TRUTH
Input/Output: None
See also: BAR, CONIC, DIFFEQ, FUNCTION, GRIDMAP, HISTOGRAM, PARAMETRIC,
PARSURFACE, PCONTOUR, POLAR, SCATTER, SLOPEFIELD, WIREFRAME, YSLICE
TSIMP
Type: Command
Description: Performs simplifications on expressions involving exponentials and logarithms. Converts base 10
logarithms to natural logarithms
Access: Exponential and logarithms, !Ð L, or …ÑLL
Input: An expression
Output: The simplified expression.
Flags: Exact mode must be set (flag –105 clear).
Numeric mode must not be set (flag –3 clear).
Example: Simplify log(x+x)
Command: TSIMP(LOG(X+X))
Result: (LN(2)+LN(X))/(LN(5)+LN(2))
See also: TEXPAND, TLIN
TSTR
Type: Command
Description: Date and Time String Command: Returns a string derived from the date and time.
The string has the form "DOW DATE TIME", where DOW is a three-letter abbreviation of the
day of the week corresponding to the argument date and time, DATE is the argument date in the
current date format, and TIME is the argument time in the current time format.
Access: …Ó TOOLS LL TSTR ( Ó is the right-shift of the 9 key).
Flags: Time Format (–41), Date Format (–42)