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Applying labels to specific data points

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K M
K M 2018-1-15
编辑： Adam Danz 2019-12-13
I have a scatter plot of x = [0 1 2] and y = [8 7 6] with corresponding labels in N = ['A', 'B', 'C']. I know how to add labels to all the data points using the text() or labelpoints() functions but I was wondering if there was a way to apply labels to certain data points only, e.g. (1,7) and (2,6)?
  2 个评论
Greg
Greg 2018-1-15
Share the (relevant) code you currently have so we know what to work with.
Also, what is labelpoints? If you're using non-bundled functions, it helps to say so.

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Greg
Greg 2018-1-15
If you're already using text, just throw an index into the mix... Assuming you have:
text(x,y,N);
Change it to:
N = ['A';'B';'C']; % If "N" is not cellstr or string datatype, must be column vector
labelinds = [2,3];
text(x(labelinds),y(labelinds),N(labelinds));
  2 个评论
K M
K M 2018-1-15
Thanks for your help, N is a string array. I was using an index, the labels were just too long so it looked like they had been randomly placed. Is it possible for me to change the colour of the labelled data points? The data points are tightly clustered so it is hard to see which points the labels are referring to.
Greg
Greg 2018-1-16
编辑：Greg 2018-1-16
Objects returned by the text function have a 'Color' property. I doubt you can set each one to a unique color in a single call to text, but you can loop through the output afterward.
htext = text(...);
C = [1,0,0; ... red
0,1,0]; % green
for itext = 1:length(labelinds)
htext(itext).Color = C(itext,:);
end

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