Hi Ricardo,
Your bins Linear1DSet has 11 bins, with the two end bins each
only covering half a bin interval. The sample values are actually
bin centers. So you'll get what you want with 10 evenly spaced
bins:
Linear1DSet bins = new Linear1DSet(0.05, 0.95, 10);
This divides (0.0, 1.0) into 10 equal sized bins, with their
centers at 0.05, 0.15, ..., 0.95.
Cheers,
Bill
Ricardo Mantilla wrote:
>
> Hi Bill and All,
>
> I made this small program to test the Histogram function. what it does
> is to generate 10000 random numbers and get the histogram. I was
> expecting to have more or less the same number of points per bin but I
> am having only a half of the points in the first and last "interval".
>
> May be I am either making a wrong interpretation of the results or I am
> giving the wrong input to the program.
>
> Thanks again,
> Ricardo Mantilla
> University of Colorado at Boulder
>
> import visad.*;
> import visad.java2d.DisplayImplJ2D;
> import java.rmi.RemoteException;
> import java.awt.Font;
>
> public class testHisto extends java.lang.Object {
>
> /** Creates new testHisto */
> public testHisto() throws RemoteException, VisADException{
>
>
> RealType numLinks = RealType.Generic;
> RealType distanceToOut = RealType.Generic;
>
> FunctionType func_distanceToOut_numLinks = new
> FunctionType(distanceToOut, numLinks);
>
> Linear1DSet distanceToOut_set = new Linear1DSet(0, 1, 10000);
>
> float[][] NumL_vals = new float[1][10000];
> for (int i=0;i<10000;i++) NumL_vals[0][i]=(float) Math.random();
>
> FlatField vals_ff = new FlatField( func_distanceToOut_numLinks,
> distanceToOut_set);
> vals_ff.setSamples( NumL_vals );
>
> Linear1DSet bins = new Linear1DSet(0, 1, 11);
>
> FlatField hist = visad.math.Histogram.makeHistogram(vals_ff, bins);
>
> float[][] otra=bins.getSamples();
> double[][] algo=hist.getValues();
>
> for (int i=0;i<algo[0].length;i++)
> System.out.println(otra[0][i]+" "+algo[0][i]);
>
> }
>
> /**
> * @param args the command line arguments
> */
> public static void main (String args[]){
> try{
> new testHisto();
> } catch (VisADException v){
> System.err.println(v);
> } catch (RemoteException r){
> System.err.println(r);
> }
> }
>
> }
--
----------------------------------------------------------
Bill Hibbard, SSEC, 1225 W. Dayton St., Madison, WI 53706
hibbard@xxxxxxxxxxxxxxxxx 608-263-4427 fax: 608-263-6738
http://www.ssec.wisc.edu/~billh/vis.html
