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I used gnuplot a while ago because I didn't want to have to deal with the line-drawing logic GD required. (I also haven't used GD in a couple years.) With gnuplot the script just generats a text file and runs gnuplot.
http://www.gnuplot.info/demo/finance.html has some financial graphing using gnuplot. There is also flot that does all the graphing in javascript. In reply to Re: An alternative for Gd?
by superfrink
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