# Defining And Using Functions; Function Tinc - HP 50g User Manual

Graphing calculator.

### Function TINC

Function TINC(T
, T) calculates T
+DT. The operation of this function is similar
0
0
to that of function TDELTA in the sense that it returns a result in the units of T
.
0
Otherwise, it returns a simple addition of values, e.g.,

## Defining and using functions

Users can define their own functions by using the DEF command available
thought the keystroke sequence „à (associated with the 2 key). The
function must be entered in the following format:
Function_name(arguments) = expression_containing_arguments
For example, we could define a simple functionH(x) = ln(x+1) + exp(-x).
Suppose that you have a need to evaluate this function for a number of discrete
values and, therefore, you want to be able to press a single button and get the
result you want without having to type the expression in the right-hand side for
each separate value. In the following example, we assume you have set your
calculator to ALG mode. Enter the following sequence of keystrokes:
„à³~h„Ü~„x™‚Å
‚¹~„x+1™+„¸~„x`
The screen will look like this:
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