Shadowing issue with DeleteDuplicatesBy

Asked Aug 17 '15 at 18:02

Active Aug 18 '15 at 04:34

Viewed 178 times

I have been running a function in Mathematica 10 with the command, DeleteDuplicatesBy. The function was working great until one day I started to get an error with the DeleteDuplicatesBy command. When I tried to run it, the command would turn red and say, "A symbol occurs in more than one context: One of the definitions is shadowed."

I have Mathematica 9 and 10 installed on my computer. I am not sure if that could be causing the error. Here is an image of the error in action.

Error

edited Aug 18 '15 at 04:34

MarcoB

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asked Aug 17 '15 at 18:02

hmm1050

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Does this persist on restarting the kernel? – Patrick Stevens Aug 17 '15 at 18:11
yes it does, i am very confused as to what the problem could be – hmm1050 Aug 17 '15 at 18:19
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Which contexts does the symbol appear in? (Determine this with Names["*\DeleteDuplicatesBy"]`.) – Patrick Stevens Aug 17 '15 at 18:25
the output is, {"DeleteDuplicatesBy"} – hmm1050 Aug 17 '15 at 18:33
So it appears only in the Global context. Was the symbol appearing red there? – Patrick Stevens Aug 17 '15 at 18:36
it was not red when using the Names function – hmm1050 Aug 17 '15 at 18:52
That would explain it. Next time it goes red, could you run the Names code again? – Patrick Stevens Aug 17 '15 at 18:59
Have you tried a simpler test such as DeleteDuplicatesBy[{{a,y},{b,y},{c,z},{d,y}},Last] before doing the more complicated example in your screen shot? Or is there a reason you posted the more complicated example? Maybe it would also help to know your OS. – Jens Aug 17 '15 at 19:00
@Jens I have tried a example like you've suggested and the command still shows up red. I am running OS X Yosemite – hmm1050 Aug 17 '15 at 20:42
@Patrick Stevens , DeleteDuplicatesBy is still showing up as red, but not when I run it in the names command like you suggested earlier. – hmm1050 Aug 17 '15 at 20:43
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Please try evaluating RebuildPacletData[] and see if this fixed the issue. – Stefan R Aug 17 '15 at 21:47
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What version of Mathematica are you using ({$VersionNumber, $ReleaseNumber})? Try turning off the suggestions bar in Preferences, restart Mathematica, and try again. I'm wondering if it is related to this – Szabolcs Aug 18 '15 at 06:00
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@Szabolcs I am running Mathematica 10.1, 0 I also turned off the suggestions bar in Preferences and it seems to have fixed my problem. Thank you. – hmm1050 Aug 18 '15 at 13:30

Shadowing issue with DeleteDuplicatesBy

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