HP 39g Loop commands

→PLOT	Puts graph from graphicname into the Plot view display.
	→PLOT graphicname:
REPLACE	Replaces portion of graphic in graphicname1 with
	graphicname2, starting 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-clauserepeatedly until test-clausereturns 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

16-22 Programming