Graph Plotting - Casio Reckon User Manual

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Graph Plotting

The Plot() function makes a graphical plot of a function. This is bound to the F4 key. Plot expect three
parameters, the function to plot, the min and max of the x-axis.
For example Plot(Sin(X),0,2π). will plot the graph of sin(x) for x in [0,2π].
To make things simpler, Reckon examines the expression given as the first parameter to Plot() to determine
the independent variable; X in this example. Plot expects an expression with exactly one unbound variable.
This variable is the one assumed to be the x-axis.
Example:
A = 2
B = 3
Plot(B*Sin(A*T),0,5)
Will plot 3Sin(2t) for t in [0,5] assuming T is not bound.
The plot function draw the plot and presents the graphical view. In this mode, the view may be examined
before returning to the calculation engine. The 4-way navigator may be used to adjust the view. Left and
right scroll the graph horizontally, whilst up and down zoom in and out. Zoom is much harder than scroll
and consequently the graph may struggle to keep up. Presently, the new graph will smooth out and the
view become accurate.
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Example 1:
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To plot enter Plot(Sin(X)/X,-7,-7). Then scroll about. Here, the function has been scrolled left a bit.
Pressing EXE at this point cycles through the points of interest (POI). These are the zeros and min/max
values. When a box is drawn (like in the picture), this is a zero and the value of X for the root is shown. For
min/max, the function value is shown (Y) instead of X (no box is drawn in this case).
Example 2:
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Plot , enter Plot(Exp(-X^2/2)/Sqrt(2π)-0.1,-4,4)
Again we can cycle through the POI with EXE. Note, that POI is only available after the plot is fully drawn.