# HP 50g User Manual Page 285

Graphing calculator.

Highlighting the entire expression and using the @EVAL@ soft menu key, we get the
result: -15.
Note: The vector A can also be referred to as an indexed variable because
the name A represents not one, but many values identified by a sub-index.
To replace an element in an array use function PUT (you can find it in the
function catalog ‚N, or in the PRG/LIST/ELEMENTS sub-menu – the later
was introduced in Chapter 8). In ALG mode, you need to use function PUT with
the following arguments: PUT(array, location to be replaced, new value). For
example, to change the contents of A(3) to 4.5, use:
In RPN mode, you can change the value of an element of A, by storing a new
value in that particular element. For example, if we want to change the
contents of A(3) to read 4.5 instead of its current value of –3., use:
4.5`³~a„Ü3`K
To verify that the change took place use: ‚@@@@A@@ . The result now shown is: [-
1 -2 4.5 -4 -5 ].
Note: This approach for changing the value of an array element is not
allowed in ALG mode, if you try to store 4.5 into A(3) in this mode you get the
following error message: Invalid Syntax.
To find the length of a vector you can use the function SIZE, available through
the command catalog (N) or through the PRG/LIST/ELEMENTS sub-menu.
Some examples, based on the arrays or vectors stored previously, are shown
below:
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