Decimal, Integer & Trig - HP 39g Master Manual

Decimal, Integer & Trig
The next option of Decimal resets the scales
so that each pixel (dot on the screen) is exactly
.
− ⋅ ≤ ≤ ⋅
0 1. The result is an X scale of
6 5 x 6 5
− ⋅ ≤ ≤ ⋅ . This may not
and a Y scale of 3 1
y 3 2
give the best view of the function. Personally I
don't often use it, as it is generally easier to go
to the PLOT SETUP view and press SHIFT CLEAR.
The Integer option is similar to decimal, except
that it sets the axes so that each pixel is 1
rather than 0.1 thus giving an X scale of
− ≤ ≤
.
65 X 65
The usual result of this is rather horrible.
The final option of Trig is designed for
graphing trig functions. It sets the scale so
π
each pixel is . This means that if you
24
=
were graphing then 24
F X 1( ) 2sin( ) X
presses of the left or right arrows would move
π
you through exactly and the value would be exactly 2 instead of a horrible
decimal.
If you zoom in or out from this, the jumps will still stay relatively nice,
particularly since 24 has so many factors. For example, with a zoom factor of
π
2, zooming out once would mean each pixel was now , while zooming in
48
π
would give a pixel jump of .
12
As you can see, the cursor is nicely at a value
π
of , giving a y value of exactly 1 instead of
2
only very close.
97