Plotting histograms
Histograms are a very popular method of discovering the frequency distribution of a set of continuous data. In a histogram, data scientists usually show the quantitative variable along the x axis and frequency of that variable along the y axis. A few key features of histograms that make it very useful are as follows:
Only numerical data can be plotted
Huge datasets can easily be plotted
The x axis is usually used as bins or intervals of quantitative variables
In this recipe, we will see how to plot histograms using GRAL
Getting ready
To use GRAL to plot histograms, we need the example applications provided with the library in the form of Jar files. These example applications can be downloaded from http://trac.erichseifert.de/gral/wiki/Download. Download the
gral-examples-0.10.zipfile from the download location to your local disk. Extract the files:
Once you download the Zip file and extract it, you will see a directory structure as follows, where our folder of interest is...
