[mathcad] Mathcad 7 to Mathcad 11 Problem

Author: Oakley, Philip SELEX UK Posted: Mon, 10 Oct 2005 13:00:11 +0100

Bill
The problem is that in version 7 and before, there was a trick that "zero times anything" (including an error) immediately computed as zero (a scalar). This trick is used in your example sheet.

In version 11 this was corrected so that "zero times something" evaluated the something and returned the a matrix/vector/scalar/error as required.
This does break a few worksheets which depended on the trick. [both the elimination of the errors and the change from matrix/vector to scalar]

Philip
PS this reply sent to list.

From: Bill E Dumke "mailto:Bill.Dumke"
Sent: 07 October 2005 19:46
To: Mathcad Discussion List
Subject: [mathcad] Mathcad 7 to Mathcad 11 Problem

I was trying to get this example (Example 2.10) from "An Introduction to
Digital Signal Processing with Mathcad" to run in Mathcad 11.2a. It was
originally part of an e-book using the Mathcad 7 engine. And it works
fine using the Mathcad 7 engine supplied with the book.

Attached is a Mathcad 11.2a file. I get an error message when trying to
do the aperiodic convolution given by the expression for y.

I suspect there is a syntax difference between Mathcad 7 and 11.2a
preventing it from running.

How can I get this to run in Mathcad 11.2a?

Note that running the e-book directly from Mathcad 11.2a results in the
same error message, so I don't believe there is any error in my typing
of the expression itself.

Bill

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