
4 Computer algebra system (CAS)
A computer algebra system (CAS) enables you to perform symbolic calculations. By default, CAS works in
exact mode, giving you innite precision. On the other hand, non-CAS calculations, such as those performed
in HOME view or by an app, are numerical calculations and are often approximations limited by the precision
of the calculator (to 12 signicant digits in the case of the HP Prime). For example, 1/3+2/7 yields the
approximate answer .619047619047 in Home view (with Standard numerical format), but yields the exact
answer 13/21 in the CAS.
The CAS oers many hundreds of functions, covering algebra, calculus, equation solving, polynomials, and
more. You select a function from the CAS menu, one of the Toolbox menus. For more information on the CAS
commands, see CAS menu in the Functions and commands chapter.
CAS view
CAS calculations are done in CAS view. CAS view is almost identical to Home view. A history of calculations is
built and you can select and copy previous calculations just as you can in Home view, as well as store objects
in variables.
To open CAS view, press . CAS appears in white at the left of the title bar to indicate that you are in
CAS view rather than Home view.
The menu buttons in CAS view are:
●
—assigns an object to a variable.
●
—applies common simplication rules to reduce an expression to its simplest form. For
example, yields b*EXP(a)*EXP(c).
●
—copies a selected entry in history to the entry line.
●
—displays the selected entry in full-screen mode, with horizontal and vertical scrolling
enabled. The entry is also presented in textbook format.
CAS view 47
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