HP 49g+, Руководство пользователя, Страница: 292 / 862

Page 9-21
n+1:. For example, to create the list {1, 2, 3}, type:
1` 2`
3` 3` „° @)TYPE! ! LIST@
.
Function ARRY
This function is used to create a vector or a matrix. In this section, we will use
it to build a vector or a column vector (i.e., a matrix of n rows and 1 column).
To build a regular vector we enter the elements of the vector in the stack, and
in stack level 1: we enter the vector size as a list, e.g.,
1` 2`
3` „ä 3` „° @)TYPE! ! ARRY@
.
To build a column vector of n elements, enter the elements of the vector in the
stack, and in stack level 1 enter the list {n 1}. For example,
1` 2`
3` „ä 1‚í3` „° @)TYPE! ! ARRY@
.
Function DROP
This function has the same effect as the delete key (
ƒ
).
Transforming a row vector into a column vector
We illustrate the transformation with vector
[1,2,3]
. Enter this vector into
the RPN stack to follow the exercise. To transform a row vector into a column
vector, we need to carry on the following operations in the RPN stack:
1 - Decompose the vector with function OBJ
2 - Press
1+
to transform the list in stack level 1: from {3} to {3,1}
3 - Use function ARRY to build the column vector
These three steps can be put together into a UserRPL program, entered as
follows (in RPN mode, still):
‚å„° @)TYPE! @OBJ @ 1 + ! ARRY@
`³~~rxc` K