Set theory (operators)

10222014, 11:01 AM
Post: #3




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 oncalc 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 oncalc, 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  10212014, 04:15 PM
RE: Set theory (operators)  Han  10222014, 03:36 AM
RE: Set theory (operators)  DrD  10222014 11:01 AM
RE: Set theory (operators)  Joe Horn  10232014, 08:25 AM
RE: Set theory (operators)  Alberto Candel  10222014, 03:22 PM
RE: Set theory (operators)  dbbotkin  10242014, 01:57 AM
RE: Set theory (operators)  Joe Horn  10242014, 03:57 AM
RE: Set theory (operators)  Alberto Candel  10242014, 04:26 AM
RE: Set theory (operators)  Joe Horn  10242014, 02:43 PM
RE: Set theory (operators)  DrD  10242014, 10:39 AM
RE: Set theory (operators)  DrD  10242014, 05:31 PM
RE: Set theory (operators)  parisse  10242014, 08:39 PM

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