Gxor; Hadamard; Halftan; Halt - HP 48gII Advanced User's Reference Manual

Input/Output:

GXOR

Type: Command
Description: Graphics Exclusive OR Command: Superimposes grob
corner pixel of grob
GXOR is used for creating cursors, for example, to make the cursor image appear dark on a light
background and light on a dark background. Executing GXOR again with the same image
restores the original picture.
GXOR uses a logical exclusive OR to determine the state of the pixels (on or off) in the
overlapping portion of the argument graphics objects.
Any portion of grob
If the first (level 3) argument (the target graphics object) is any graphics object other than PICT,
then grob
result
to the stack.
!°L
Access:
Input/Output:
See also: GOR, REPL, SUB

HADAMARD

CAS: Perform an element by element multiplication of two matrices (Hadamard product).

HALFTAN

CAS: Transform an expression by replacing sin(x), cos(x) and tan(x) subexpressions with tan(x/2).

HALT

Type: Command
Description: Halt Program Command: Halts program execution.
Program execution is halted at the location of the HALT command in the program. The HLT
annunciator is turned on. Program execution is resumed by executing CONT (that is, by pressing
!æ). Executing KILL cancels all halted programs.
!°LL
Access:
Input/Output: None
See also: CONT, KILL

HEAD

Type: Command
Description: First Listed Element Command: Returns the first element of a list or string.
Level 2/Argument 1 Level 1/Argument 2
GROB
1
positioned at the specified coordinate in grob
1
that extends past grob
1
is returned to the stack. If the first (level 3) argument is PICT, no result is returned
GROB GXOR
Level 3/Argument 1 Level 2/Argument 2
grob { #n, #m }
target
grob
target
PICT { #n, #m }
PICT
&
RUN DEBUG HALT
GROB
2
onto grob
1
or PICT is truncated.
target
( °is the left-shift of the Nkey).
Level 1/Argument 3
grob
(x, y) grob
grob
(x, y) grob
( °is the left-shift of the Nkey).
Full Command and Function Reference 3-75
Level 1/Item 1
GROB
3
or PICT, with the upper left
target
or PICT.
target
Level 1/Item 1
grob
1
grob
1
1
1
result
result