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Topic: Sketchpad vs Cabri = RPN vs Algebraic Entry
Replies: 1   Last Post: Jun 21, 1995 12:55 AM

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Posts: 24
Registered: 12/3/04
Sketchpad vs Cabri = RPN vs Algebraic Entry
Posted: Jun 20, 1995 1:46 PM
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To return to an earlier discussion of which comes first, the object or
the action:
If I'm exploring a geometric situation, I find it more
convenient to look at the list of things I might do, decide on one, then
select the object. It has always appeared to me that the Sketchpad
approach assume that you know in advance exactly what yu want to do.
During a demonstration of the HP38 today (we are seriously
considering adopting it for our algebra and beginning calulus courses),
the HP rep said that one of their first considerations in developing the
device was to get rid of Reverse Polish. It occured to me that RP, in
which one decides:
I have a 6 (enter)
I want to take a 5 (enter)
then add it (push +)
is similar to the approach of the Sketchpad. One "selects" the 5, then
"uses" the +. The algebraic entry is to type 6 + 5 (enter)
The market has selected algebraic entry as more natural and
easier to use. If there is a parallel, then it would appear that Cabri's
approach is more user-friendly, if not more natural.
imho, that is.

Professor M. J. Winter email:
Department of Mathematics fax: 517.432.1562
Michigan State University telephone: 517.353.6337
East Lansing, MI 48824

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