HP 48gII - Manual (Page 683)

Page 21-34
Note: For mathematical operations with tagged quantities, the calculator will
"detag" the quantity automatically before the operation. For example, the left-
hand side figure below shows two tagged quantities before and after pressing
the * key in RPN mode:
Examples of tagged output
Example 1 – tagging output from function FUNCa
Let’s modify the function FUNCa, defined earlier, to produce a tagged output.
Use ‚ @FUNCa to recall the contents of FUNCa to the stack. The original
function program reads
« “Enter a: “ {“ :a: “ {2 0} V } INPUT OBJ→ → a «
‘2*a^2+3‘ NUM » »
Modify it to read:
« “Enter a: “ {“ :a: “ {2 0} V } INPUT OBJ→ → a «
‘2*a^2+3‘ NUM ”F” →TAG » »
Store the program back into FUNCa by using „ @FUNCa. Next, run the
program by pressing
@FUNCa. Enter a value of 2 when prompted, and press
`. The result is now the tagged result F:11.
Example 2 – tagging input and output from function FUNCa
In this example we modify the program FUNCa so that the output includes
not only the evaluated function, but also a copy of the input with a tag.
Use ‚ @FUNCa to recall the contents of FUNCa to the stack:
« “Enter a: “ {“ :a: “ {2 0} V } INPUT OBJ→ → a «
‘2*a^2+3‘ NUM ”F” →TAG » »
Modify it to read:
« “Enter a: “ {“ :a: “ {2 0} V } INPUT OBJ→ → a «
‘2*a^2+3‘ EVAL ”F” →TAG a SWAP» »