HP 48gII hp 48gII_user's manual_English_E_HDPMSG48E67_V2.pdf - Page 306

Functions GET and PUT Functions GET, GETI, PUT, and PUTI, operate with matrices in a similar manner as with lists or vectors, i.e., you need to provide the location of the element that you want to GET or PUT. However, while in lists and vectors only one index is required to identify an element, in matrices we need a list of two indices {row, column} to identify matrix elements. Examples of the use of GET and PUT follow. Let's use the matrix we stored above into variable A to demonstrate the use of the GET and PUT functions. For example, to extract element a23 from matrix A, in ALG mode, can be performed as follows: Notice that we achieve the same result by simply typing A(2,3) and pressing `. In RPN mode, this exercise is performed by entering @@@A@@@ ` 3 ` GET, or by using A(2,3) `. Suppose that we want to place the value 'π' into element a31 of the matrix. We can use function PUT for that purpose, e.g., In RPN mode you can use: J @@@A@@@ {3,1} ` „ì PUT. Alternatively, in RPN mode you can use: „ì³A(2,3) ` K . To see the contents of variable A after this operation, use @@@A@@@. Functions GETI and PUTI Functions PUTI and GETI are used in UserRPL programs since they keep track of an index for repeated application of the PUT and GET functions. The index list in matrices varies by columns first. To illustrate its use, we propose the following exercise in RPN mode: @@@A@@@ {2,2}` GETI. Screen shots showing the RPN stack before and after the application of function GETI are shown below: Page 10-6