HP 39g+, User Manual

Page: 232 / 294

16-22 Programming
→
PLOT
Puts graph from graphicname into the Plot view display.
→
PLOT
graphicname
:
REPLACE
Replaces portion of graphic in graphicname1 with
graphicname2
, s
tarting at position
. REPLACE
also
works for lists and matrices.
REPLACE
graphicname1
;
( position )
;
graphicname2
:
SUB
Extracts a portion of the named graphic (or list or matrix),
and stores it in a new variable,
name . The portion is
specified by position and positions.
SUB
name
;
graphicname
;
( position )
;
( positions )
:
ZEROGROB
Creates a blank graphic with given width and height ,
and stores it in graphicname .
ZEROGROB
graphicname
;
width
;
height
:
Loop commands
Loop hp allow a program to execute a routine repeatedly.
The hp 39g+ has three loop structures. The example
programs below illustrate each of these structures
incrementing the variable A from 1 to 12.
DO…UNTIL …END
Do
...
Until
...
End
is a loop command that executes the
loop-clause repeatedly until test-clause returns a true
(nonzero) result. Because the test is executed after the
loop-clause, the loop-clause is always executed at least
once. Its syntax is:
DO
loop-clause
UNTIL
test-clause
END
1
X
A:
DO A + 1
X
A
UNTIL A == 12
END