## (“Sigma Plus”)

Keyboard Access: x [array] [[matrix]] x y z ...HP-28: STAT HP48S: LS-STAT RS-STAT LS-PREV HP48G: LS-STAT DATA LS-PLOT NXT STAT DATA HP49/50: 97 MENU (a statistics submenu) 91 MENU (a plotting submenu)Sigma Plus command: Adds one or more data to the current statistics matrix (reserved variable ).The very first execution of (when does not exist, such as after ) stores whatever is in level 1 into (a single number or an array of numbers). That will determine the number of columns in the matrix:

All subsequent executions of will expect the correct number of data on the stack (as determined in the previous paragraph), either as that many numbers on the stack, or as that many numbers in a vector on level 1, or as a matrix with that many columns. For example, if contains 2 columns, you can input the data pair (5, 7) either as [ 5 7 ] or as 5 on level 2 and 7 on level 1. treats both input styles identically. To add more than one row of data at a time, put them in a matrix; e.g. [[ 5 7

- If a
single numberis used, then will be a single-column matrix (only useful for single-variable statistics, e.g. , , , , , , , , and ).

- If a
vectoris used, then the number of elements in the vector will be the number of columns in , with the input vector being the first row of .

- If a
matrixis used, then the matrix is stored unaltered into .][ 6 9 ]] adds both [ 5 7 ] and [ 6 9 ] as two new data pairs into .If the input is numbers on multiple stack levels, and there are insufficient data on the stack, will generate the “Too Few Arguments” error. If the input is a vector on level 1, and it has an incorrect number of elements, then will generate a “Bad Argument Value” error. If the input is a matrix on level 1, and it has an incorrect number of columns, it will also generate a “Bad Argument Value” error.

after always returns exactly one object: the newly added number or vector or matrix. If the input was on multiple stack levels, then they will all be returned in a vector by .

HP49/50maximum integer input(s): Integer inputs on the HP49/50 are converted to reals by all statistics functions, including . Therefore, MAXI is the maximum integer input allowed by even if flag -21 is clear.Due to a harmless bug in the

HP49/50, does not store multiple stack level inputs ofintegerobjects into correctly. For example, if has three columns, putting 1 2 3 on the stack in exact mode and executing stores [1 2 3.] into (two integers and one real). Array inputs are stored correctly into : [1 2 3] [1 2 3] (three integers). In both cases, [1. 2. 3.] is what gets added to .BYTES: 2.5