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Using the Matrix Writer (MTRW) to enter vectors
Vectors can also be entered by using the Matrix Writer „² (third key
in the fourth row of keys from the top of the keyboard). This command
generates a species of spreadsheet corresponding to rows and columns of
a matrix (Details on using the Matrix Writer to enter matrices will be
presented in Chapter 9). For a vector we are interested in filling only
elements in the top row. By default, the cell in the top row and first column
is selected. At the bottom of the spreadsheet you will find the following soft
menu keys:
@EDIT!
The @EDIT key is used to edit the contents of a selected cell in the Matrix
Writer.
The key, when selected, will produce a vector, as opposed to a
matrix of one row and many columns.
The key is used to decrease the width of the columns in the
spreadsheet. Press this key a couple of times to see the column width
decrease in your Matrix Writer.
The key is used to increase the width of the columns in the
spreadsheet. Press this key a couple of times to see the column width
increase in your Matrix Writer.
The key, when selected, automatically selects the next cell to the
right of the current cell when you press `. This option is selected by
default. This option, if desired, needs to be selected before entering
elements.
The key, when selected, automatically selects the next cell below
the current cell when you press `. This option, if desired, needs to
be selected before entering elements.
Activate the Matrix Writer again by using „², and press L to
check out the second soft key menu at the bottom of the display. It will
show the keys:
Moving to the right vs. moving down in the Matrix Writer
Activate the Matrix Writer and enter 3`5`2``
with the key selected (default). Next, enter the same sequence
of numbers with the key selected to see the difference. In the
first case you entered a vector of three elements. In the second case
you entered a matrix of three rows and one column.
SG49A.book Page 3 Friday, September 16, 2005 1:31 PM