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Support #1188

Product of empty list: manual and code disagree

Added by John Abbott about 6 years ago. Updated almost 6 years ago.

Status:
Closed
Priority:
Normal
Assignee:
John Abbott
Category:
Manual/documentation
Target version:
CoCoA-5.2.4
Start date:
19 Jun 2018
Due date:
% Done:

100%

Estimated time:
1.10 h
Spent time:
1.10 h

Description

What should CoCoA-5 do when asked to compute the product of the empty list?

/**/ product([]);
1

The manual is self-inconsistent. The text says that a second arg must be specified if the list might be empty, but the example shows what I've written above.

Decide what we want, and make sure that manual and code agree (impl. is in BuiltinFunctions.C:193)

History

#1 Updated by John Abbott almost 6 years ago

  • Status changed from New to Feedback
  • Assignee set to John Abbott
  • % Done changed from 0 to 90

We have decided for safety that sum/product of an empty list should give error (unless an initial value is given).

Implemented; manual corrected; package RealRoots has been updated.

#2 Updated by John Abbott almost 6 years ago

  • Status changed from Feedback to Closed
  • % Done changed from 90 to 100
  • Estimated time set to 1.10 h

Have not really tested, but what can go wrong???

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