# Atan2s; Augment; Axl - HP 48gII Advanced User's Reference Manual

Graphing calculator.

Example:
Add the CAS assumption that the global variable Z is real and positive. Note that ASSUME
will replace Z>0 with Z≥0, which does not guarantee that Z is positive, so Z≥MINR is used
instead, which guarantees that Z is greater than or equal to the smallest positive number the
calculator recognizes.
Command:
ASSUME(Z≥MINR)
Result:
Z≥MINR

## ATAN2S

Type:
Command
Description:
Transforms an expression by replacing atan(x) subexpressions with the following:
Trigonometry, ...Ñ
Access:
Input:
An expression.
Output:
The transformed expression.
Flags:
Exact mode must be set (flag –105 clear).
Numeric mode must not be set (flag –3 clear).
Radians mode must be set (flag –17 set).
ASIN2C, ACOS2S, ASIN2T

### AUGMENT

Type:
Command
Description:
Concatenate two lists, a list and an element, or a vector and an element. Also creates a matrix
from component row vectors.
Matrices, !Ø
Access:
Input:
Level 2/Argument 1: A vector, a list, a matrix, or a string.
Level 1/Argument 2: A vector, a list, a matrix, or an element.
Output:
The matrix, list or string formed by combining the arguments. In the case of a string in level
2, AUGMENT acts exactly like "+" or "ADD".
Example 1:
Append 3 to the list {1,2}:
Command:
AUGMENT({1,2},3)
Result:
{1,2,3}
Example 2:
Combine the rows [1,2,3] and [4,5,6] into a matrix:
Command:
AUGMENT([1,2,3],[4,5,6])
1 2 3
4 5 6
Result:

### AXL

Type:
Command
Description:
Converts a list to an array, or an array to a list.
Convert, !Ú
Access:
Input:
A list or an array.
x
asin
----------------- -
2
x
+
1
CREATE
, or matrices !Ø
MATRIX CONVERT
OPERATIONS
Computer Algebra Commands 4-15