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Topic: Getting the plotted data from a graph
Replies: 1   Last Post: Jun 16, 2013 5:11 AM

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Posts: 66
Registered: 4/28/07
Re: Getting the plotted data from a graph
Posted: Jun 16, 2013 5:11 AM
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Hi Lily,

That's simple after you realize that even a Plot is a list {{},{},...}. For example, in your case writing g1[[1]] will give you a list of all the elements in the plot. So, then the question is how do you retrieve the data from that mess?

Simple! Do you see the Line[], which obviously makes the line in your plot? Just extract by specifying the appropriate levels, ie g1[[1, 1, 3, 2, 1]]. Then, you can plot the points with ListPlot[g1[[1, 1, 3, 2, 1]]] to make sure it is indeed what you want.

Finally, after one realizes this, you can easily do some cool things, eg writing
g1 /. Hue[x_, y_, z_] -> Red
will change the color *after* you made the plot! So, if you have a plot that takes a long time to make, you can still make changes afterwards ;-)


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