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Functions and commands 425
Inserts a less-than-or-equal-to sign.
Inserts a greater-than-or-equal-to sign.
Evaluates the expression then stores the result in variable var.
Note that
cannot be used with the graphics G0–G9. See the
command BLIT.
expression var
i
Inserts the imaginary number i.
-1
Returns the inverse of an expression.
(Expr)
–1
Creating your own functions
You can create your own function by writing a program (see
chapter 27) or by using the simpler DEFINE functionality.
Functions you create yourself appear on the User menu (one
of the Toolbox menus).
Suppose you wanted to create the function
SINCOS(A,B)=SIN(A)+COS(B)+C.
1. Press
Sd (Define).
2. In the Name field, enter
a name for the
function—for example,
SINCOS—and tap
.
3. In the Function field,
enter the function.
eAA>+fAB>AC
New fields appear
below your function, one
for each potential
parameter it. will take.
You need to decide
which ones are to be
parameters when the
function is called. In this
example, we’ll make A
and B parameters. The value of C will be provided by
global variable C (which by default is zero).