# Function Tdelta; Function Tinc; Defining And Using Functions - HP 49g+ User Manual

Graphing calculator.

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## Function TDELTA

Function TDELTA(T
,T
) yields the temperature increment T
– T
. The result is
0
f
f
0
returned with the same units as T
, if any. Otherwise, it returns simply the
0
difference in numbers. For example,
The purpose of this function is to facilitate the calculation of temperature
differences given temperatures in different units. Otherwise, it's simply
calculates a subtraction, e.g.,

### 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).
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