Sharp el-9950

86
Chapter 4: Graphing Features
8. The CALC Function
The CALC functionutilizestheenteredgraphequationtocalculatevalues.In
conjunctionwiththe4graphcoordinates,itcanbecalledupanywhere.Notehowever
that the CALC function will not do anything if no graph equation has been entered or
specified.
The following is an example that uses the previously entered polar
graph equations above.
1. First,verifythegraph
coordinate mode by pressing
@
;
; check to see
if E COORD is set to Polar.
If not, this will need to be
changedaccordingly.Also,
make sure the angle unit B DRG is set to Rad. Otherwise the
graph will not be drawn correctly.
Press
@
f
, press
F
to select F CURSOR, and
2
to select 2 PolarCoord.
2. Press
Y
to verify the
previously entered polar
graph equation, then press
G
to draw the graph.
Adjusttheviewbyusing
Z
menu items.
3. Press
@
k
.
4. Press
1
to select 1
Value. The graph is drawn
back on the screen again,
with the
θ
= prompt visible
at the bottom left side of the
screen.
5. Enter the
θ
value at the
prompt. Enter
π
, for example.
Be aware that
θ
cannot be
more than 2
π
(2
π
radians =
360 degrees).
6. Upon pressing
E
, the radian r coordinate will be calculated.