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Programs - HP -28S Manual

Advanced scientific calculator.
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• EQ refers to the current equation used by the Solver and PLOT
commands.
~PAR
refers to a list of parameters used by statistics commands.
• PPAR refers to a list of parameters used by plot commands.
~DAT
refers to the current statistical array.
• s1, s2, and so on, are created by ISOL and QUAD to represent arbi-
trary signs obtained in symbolic solutions.
• n1, n2, and so on, are created by ISOL to represent arbitrary inte-
gers obtained in symbolic solutions.
• Names beginning with "der" refer to user-defined derivatives.
You can use any of these names for your own purposes, but remem-
ber that certain commands use these names as implicit arguments.
Programs
Programs are sequences of objects and commands. Each program is
essentially a command line made into an object; when you surround
the contents of the command line by program delimiters, you indicate
that you want to save the contents for later execution.
Special program commands appear in the PROGRAM BRANCH,
PROGRAM CONTROL, and PROGRAM TEST menus. These menus
are described in the Reference Manual, along with the general topic
"Programs."
You wrote five programs in part 1:
• In chapter 3 you wrote a program for renaming variables, and you
stored it in the variable RENAME.
• In chapter 5 you wrote a program for the cotangent function, and
you stored it in the variable COT.
• In chapter 6 you wrote a program for adding polar coordinates, and
you stored it in the variable PSUM.
• In chapter 14 you wrote programs for converting between ounces
and grams, and you stored them in the variables O-+G and G-+O.
160
16: Objects

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