Re: how to graphically fill the tails of a normal distribution
- To: mathgroup at smc.vnet.net
- Subject: [mg50044] Re: [mg50012] how to graphically fill the tails of a normal distribution
- From: DrBob <drbob at bigfoot.com>
- Date: Thu, 12 Aug 2004 05:44:51 -0400 (EDT)
- References: <200408110953.FAA04135@smc.vnet.net>
- Reply-to: drbob at bigfoot.com
- Sender: owner-wri-mathgroup at wolfram.com
I can't read any of that, but maybe this is close to what you want?
Needs["Graphics`"]
Needs["Statistics`"]
f[x_] := PDF[NormalDistribution[0, 1], x]
DisplayTogether[FilledPlot[f[x], {x, -3, -2}, Fills -> Red], Plot[f[
x], {x, -3, 3}], FilledPlot[f[x], {x, 2, 3}, Fills -> Red]]
Bobby
On Wed, 11 Aug 2004 05:53:11 -0400 (EDT), Todd Allen <genesplicer28 at yahoo.com> wrote:
>
> Hello all,
> Hope you don't mind a question from a biologist trying to learn Mathematica. I have been teaching myself the syntax of Mathematica to analyze microarray data (i.e, a technology to simultaneously monitor the expression levels of thousands of genes). I am interested in producing a plot for a presentation in which the tails of a normal distribution are colored red to illustrate a concept. I can get the plot to work with a single tail, but I can't get the syntax to work for both tails of the disribution. Here is my code:
>This works for a single tail, with the following code (necessary packages already loaded):
> ndist=NormalDistribution[0,1]
>
> npdf=PDF[ndist,x]
>
> FilledPlot[{npdf,If[x³2,0,npdf]},{x,-4,4},Fills®RGBColor[1,0,0]]
>
> However when I try the following with the Or operator (at least I think Or operator):
>
> FilledPlot[{npdf,If[x³2.0þx£-2.0,0,npdf]},{x,-4,4},Fills®RGBColor[1,0,0]]
>
> I get a series of error messages:
>
> Plot:plnr:If[x³2.0þx£-2.0,0,npdf] is not a machine-size real number at x=-4
>
> This error repeats itself with different x values and then a normal curve is drawn with neither tail colored in.
>
>
>What am I missing here?
>Any insight is much appreciated, thanks!
> Todd
>
>
--
DrBob at bigfoot.com
www.eclecticdreams.net
- References:
- how to graphically fill the tails of a normal distribution
- From: Todd Allen <genesplicer28@yahoo.com>
- how to graphically fill the tails of a normal distribution