Set theory (operators)
10-22-2014, 11:01 AM
Post: #3
 DrD Senior Member Posts: 1,133 Joined: Feb 2014
RE: Set theory (operators)
Han, thanks for responding. I tried and learned from your examples, however on emu the form:

union( {1,2}, {1,2,3} ) did not work for me; {1,2} union {1,2,3} worked great!

intersect( {1,2}, {1,2,3} ) worked using both methods.

So a couple of things:

I could find no reference to help on-calc or user guide, for the 'union' function. The 'intersect' function does have help support, but does not reveal an example like you've given: {1,2} intersect {1,2,3}.

The main point of my posting, however, was not about the functions. It is about set notation operators that invoke the operation: (U or ∩). There have been times when I would have liked to have been able to use: {1,2} U {1,2,3}, instead of the longer form: {1,2} union {1,2,3}, for SET operations (example).

Help for 'intersect' while available, worked as expected on-calc, but one would probably search the user guide for "intersection," and quickly discover a lot of hits focused mainly on plotting, or at least within a graphical context, not set theory.

Usually, when I wonder about such things, Joe Horn shows up with some clever way I never thought of, to solve sometimes more than I was even questioning, and so I "put it out there" to see if he, or someone, had discovered trickery absent from help files!

I appreciate your taking the time to shed additional light on this!

-Dale-
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 Messages In This Thread Set theory (operators) - DrD - 10-21-2014, 04:15 PM RE: Set theory (operators) - Han - 10-22-2014, 03:36 AM RE: Set theory (operators) - DrD - 10-22-2014 11:01 AM RE: Set theory (operators) - Joe Horn - 10-23-2014, 08:25 AM RE: Set theory (operators) - Alberto Candel - 10-22-2014, 03:22 PM RE: Set theory (operators) - dbbotkin - 10-24-2014, 01:57 AM RE: Set theory (operators) - Joe Horn - 10-24-2014, 03:57 AM RE: Set theory (operators) - Alberto Candel - 10-24-2014, 04:26 AM RE: Set theory (operators) - Joe Horn - 10-24-2014, 02:43 PM RE: Set theory (operators) - DrD - 10-24-2014, 10:39 AM RE: Set theory (operators) - DrD - 10-24-2014, 05:31 PM RE: Set theory (operators) - parisse - 10-24-2014, 08:39 PM

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