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The MATH key next to VARS provides access to a
library of mathematical functions. The more
common functions have keys of their own, but there
is a limit to the number of keys that one can put on a
calculator before it takes too long to find the key
required.
The MATH menu lists all those functions that would not fit onto the keyboard
plus some which also appear on the keyboard. Shown in the screen
snapshot above is a small selection of the total list. For a listing of almost all
the functions, with examples of their use, see the chapter entitled “The MATH
Menu” on page 243.
Most of the keys have another function in light blue above the
key. The hp 39g+ gets twice the action from each key by
having this second function.
The second function is accessed via the SHIFT key on the left side of
the calculator. Although this book will sometimes tell you explicitly to press
this key, in most cases it will be assumed that you are intelligent enough to
work out for yourself when it is necessary to press it.
The ALPHA key gives alphabetical characters, shown below right of
most keys. Pressing SHIFT ALPHA gives lower case. If you press
and hold down the ALPHA key you can ‘lock’ alpha mode but this
doesn’t work for lower case. Many people use this to type in
functions by hand rather than using the MATH menu.
Calculator Tip
You can use the ALPHA button to type in functions by
hand instead of going through the MATH menu. This is
often faster.
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