Re: Counting Categories
- To: mathgroup at smc.vnet.net
- Subject: [mg96885] Re: [mg96798] Counting Categories
- From: DrMajorBob <btreat1 at austin.rr.com>
- Date: Thu, 26 Feb 2009 08:01:06 -0500 (EST)
- References: <200902250903.EAA15666@smc.vnet.net>
- Reply-to: drmajorbob at bigfoot.com
I don't see an easy way to use GatherBy for this... but there may be one. Bobby On Wed, 25 Feb 2009 07:14:08 -0600, Gregory Lypny <gregory.lypny at videotron.ca> wrote: > This is so cool. Thank you. I also found a new function yesterday > called GatherBy. Not sure if it does the same thing. > > Regards, > > Gregory > > > On Wed, Feb 25, 2009, at 5:21 AM, DrMajorBob wrote: > >> Something like: >> >> colors = {red, yellow, green, blue}; >> sizes = {small, medium, large}; >> randomColor := RandomChoice@colors >> randomSize := RandomChoice@sizes >> pairs = Table[{randomColor, randomSize}, {50}]; >> >> Partition[Count[pairs, #] & /@ Tuples[{colors, sizes}], Length@sizes] >> >> {{5, 3, 3}, {3, 6, 3}, {8, 1, 2}, {5, 4, 7}} >> >> or >> >> Apply[Count[pairs, {##}, 1] &, Outer[List, colors, sizes], {2}] >> >> {{5, 3, 3}, {3, 6, 3}, {8, 1, 2}, {5, 4, 7}} >> >> Bobby >> >> On Wed, 25 Feb 2009 03:03:33 -0600, Gregory Lypny >> <gregory.lypny at videotron.ca> wrote: >> >>> Hello Everyone, >>> >>> I'm trying to do multivariate category counts in the way that used to >>> be handled by CategoryCounts but is now replaced by Cases. The >>> example in Help simply applies Cases twice to find the count of >>> elements in a list that are numbers and the count that is even. >>> >>> Map[Cases[{a, b, c, 1, 2, d, 3}, #] &, {_?NumberQ, _?EvenQ}] >>> >>> {{1, 2, 3}, {2}} >>> >>> But what if I have many rows of observations on two dimensions >>> (columns) such as red, blue, green, and small, medium, big? I'd like >>> to be able categorize them accordingly as the count of small and red, >>> medium and red, big and red, and so on. Any way to do that? >>> >>> Regards, >>> >>> Gregory >>> >>> >>> >>> >> >> >> >> --DrMajorBob at longhorns.com > -- DrMajorBob at longhorns.com
- References:
- Counting Categories
- From: Gregory Lypny <gregory.lypny@videotron.ca>
- Counting Categories