HP 15c - Manual (Page 144)

144 Section 12: Calculating with Matrices
To store or recall sequential elements of a matrix:
1. Be sure the matrix is properly dimensioned.
2. Press ´ >1. This stores 1 in both storage registers R
0
and
R
1
, so that elements will be accessed starting at row 1, column 1.
3. Activate User mode by pressing ´ U. With the calculator in
User mode, after each element is stored or recalled the row number
in R
0
or the column number in R
1
is automatically incremented by 1,
as shown in the example following.
4. If you are storing elements, key in the value of the element to be
stored in row 1, column 1.
5. Press O or l followed by the letter key specifying the
matrix.
6. Repeat steps 4 and 5 for all elements of the matrix. The row and
column numbers are incremented according to the dimensions of the
matrix you specify.
While the letter key specifying the matrix is held down after O or
l is pressed, the calculator displays the name of the matrix followed by
the row and column numbers of the element whose value is being stored or
recalled. If the letter key is held down for longer than about 3 seconds, the
calculator displays null, doesn't store or recall the element value, and
doesn't increment the row and column numbers. (Also, the stack registers
aren't changed.)
After the last element of the matrix has been accessed, the row and column
numbers both return to 1.
Example: Store the values shown below in the elements of the matrix A
dimensioned above. (Be sure matrix A is dimensioned to 2×3.)














6 5 4
3 2 1
23 22 21
13 12 11
a a a
a a a
A