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MathGroup Archive 2004

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RE: Count

  • To: mathgroup at smc.vnet.net
  • Subject: [mg47363] RE: [mg47330] Count
  • From: David.Annetts at csiro.au
  • Date: Tue, 6 Apr 2004 06:37:17 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Hi Paolo,

> if i have a time serie, how can i Count the elements of this 
> time serie that are within a defined range
> Example:
> 
> x={1,1.023,1.056,2.45,5.67,....}
> 
> how can i Count the elements inside the range (1,3)?

It's a 2-step process.  First off, select all elements in your series
within the range, then count them.  For example,

In[9]:=
ser01 = Table[Random[Real, {-5, 5}], {10}]
cnt01 = Select[ser01 ,(1 < # < 3)&]
Length@cnt01

Out[9]=
{3.05377,-0.301533,-1.19397,-1.16077,4.70664,3.6502,-4.68973,-0.862422,4
.\
85626,1.97491}

Out[10]=
{1.97491}

Out[11]=
1

Just checking ...

In[15]:=
ser02 = Table[Random[Real, {3, 5}], {10}]
cnt02 = Select[ser02 ,(1 < # < 3)&]
Length@cnt01

Out[15]=
{4.29284,3.49001,4.44606,4.49608,4.68209,4.55032,3.68485,3.72823,4.74076
,4.\
82028}

Out[16]=
{}

Out[17]=
0

Regards,

Dave.
==========================================
  Dr. David Annetts
  EM Modelling Analyst
  CSIRO DEM            Tel: +612 9490 5416
  North Ryde           Fax: +612 9490 5467
  Australia         David.Annetts at csiro.au
===========================================


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