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2d arrays

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I have a file of seven columns, each column contains approximately 100 numbers in length,
I need to take these seven columns of data into an array and then access the array accordingly in terms of the columns which I will then use to plot many graphs. At any one time I will access only two columns.
I already have the graph plotting program and the graph will be displayed on an applet in a web page on the WWW.
The person who accesses the web page will want certain columns plotting against other columns so the web page needs to take in this data (i.e. which column to plot against which), select the appropriate columns in the array and then plot the graph. All this has to be done using a gui. Any suggestions on appropriate code.
Have you got any idea on how to do this.
I appreciate the help
Andrew Stevenson
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