Texas Instruments TI-83 PLUS - Manual (Page 229)

TI-83 Plus Draw Instructions 226
Shading Areas on a Graph
Shading a Graph
To shade an area on a graph, select 7:Shade( from the
DRAW
menu. The
instruction is pasted to the home screen or to the program editor.
Shade( draws lowerfunc and upperfunc in terms of X on the current graph
and shades the area that is specifically above lowerfunc and below
upperfunc . Only the areas where lowerfunc < upperfunc are shaded.
Xleft and Xright , if included, specify left and right boundaries for the
shading. Xleft and Xright must be numbers between Xmin and Xmax ,
which are the defaults.
pattern specifies one of four shading patterns.
pattern = 1 vertical (default)
pattern = 2 horizontal
pattern = 3 negative—slope 45 ¡
pattern = 4 positive—slope 45 ¡