Graph one set of data in two different colors

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Madison Lawhorn
Madison Lawhorn 2015-7-17
评论： Star Strider 2015-7-17
I have a set of data in a matrix and I wanted to create a scatter plot where if the ratio of X/Y is <4 my points were one color and if the ratio is >=4 the points would appear as another color, all on one graph. I tried
if X/Y >4
plotmatrix(X,Y,'g')
hold on
else
plotmatrix(X,Y,'b')
end
hold off

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回答（1 个）

Mike Garrity
Mike Garrity 2015-7-17
One approach is something like the following:
x = rand(1,500);
y = rand(1,500);
mask = x./y > 4;
scatter(x(mask),y(mask))
hold on
scatter(x(~mask),y(~mask))
legend('x/y > 4','x/y <= 4')
The mask variable is a logical vector which tells which of your data values fall into each of your two classes. Then you can use logical indexing to extract the elements of your data which belong to a particular class.

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