Creating colours for given points on a graph

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jamie
jamie 2013-4-12
I want a graph of t by n (t ranges from 0.1 to 100 and n from 0.01 to 100). And I have calculated roots between these ranges for an equation. I need to plot a gray or dark colour for positive root values and just white for negative root values but I am not sure how to do this. Can anyone help? I am relatively new to matlab
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Walter Roberson
Walter Roberson 2013-4-12
Do you want a mesh plot or a surface plot or a scatter plot? If you want a mesh or surface plot, then what color should the joining lines or surfaces be? What color should the background be if you want the white values to show up?
jamie
jamie 2013-4-15
I just want the corresponding point to be either given a dark gray colour or white colour and the background to just be white so I can just see two areas (dark gray and white). This will be a scatter plot

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回答（1 个）

Image Analyst
Image Analyst 2013-4-15
One of the arguments to scatter is the color. Make an N by 3 array of doubles in the range of 0-1 which represent the RGB color for each of your elements.

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