Operation Manual

Chapter 3: Function Graphing 83
Smart Graph
Smart Graph is a TI-84 Plus C feature that re-displays the last graph immediately when you press s,
but only if all graphing factors that would cause replotting have remained the same since the graph
was last displayed.
If you performed any of the following actions since the graph was last displayed, the TI-84 Plus C will
replot the graph based on new values when you press s.
• Changed a mode setting that affects graphs
• Changed a function in the current picture
• Selected or deselected a function or stat plot
• Changed the value of a variable in a selected function
• Changed a window variable or graph format setting
• Cleared drawings by selecting
ClrDraw
• Changed a stat plot definition
Overlaying Functions on a Graph
You can graph one or more new functions without replotting existing functions. For example, store
sin(X) to Y1 in the Y= editor and press s. Then store cos(X) to Y2 and press s again. The
function Y2 is graphed on top of Y1, the original function.
Graphing a Family of Curves
If you enter a list (Chapter 11) as an element in an expression, the TI-84 Plus C plots the function for
each value in the list, thereby graphing a family of curves. In Simul graphing-order mode, it graphs all
functions sequentially for the first element in each list, and then for the second, and so on.
{2,4,6}sin(X) graphs three functions: 2 sin(X), 4 sin(X), and 6sin(X).
{2,4,6}sin({1,2,3}X) graphs 2sin(X), 4sin(2X), and 6sin(3X) .
Note: When using more than one list, the lists must have the same dimensions.