problem with colorbar in using scatter3
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Farid Khazaeli Moghadam
le 6 Sep 2022
Commenté : Farid Khazaeli Moghadam
le 7 Sep 2022
Hi. I have a table called "damage" with four collumns "wind", "I", "derate", "Index4". I am using the following code to plot "Index4" vs. "wind", "I" and "derate":
s = scatter3(damage,'wind','I','derate','filled','ColorVariable','Index4'); s.SizeData = 100;colorbar
but I get the following error:
Error using scatter3 (line 57)
Color must be one RGB triplet, an m-by-3 matrix of RGB triplets with one color per scatter point, or an m-by-1 vector with one
value per scatter point.
Any feedback is very much appreciated.
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Cris LaPierre
le 6 Sep 2022
First, the error is not related to colorbar. It is an error occurring with scatter3, specifically the format of your ColorVariable.
It looks like you found this example in the doc: https://www.mathworks.com/help/matlab/ref/scatter3.html#mw_980777c0-abb7-4053-b084-6da6cc75c25a
I can duplicate the error by making Index4 anything but what is expected (indicated in the error message). The fix is to make Index4 one of the accepted inputs (described here: https://www.mathworks.com/help/matlab/ref/scatter3.html#mw_0ec595ed-40a4-4191-be63-534236f0fb9e)
% How I can recreate the error message: Index4 is not mx3, 1x3, nor mx1
wind = [30 40 50]';
I = [1 2 3]';
derate = [5 6 5]';
Index4 = [1 3 7;2 5 9]';
damage = table(wind,I,derate,Index4)
s = scatter3(damage,'wind','I','derate','filled','ColorVariable','Index4');
s.SizeData = 100;
colorbar
3 commentaires
Cris LaPierre
le 6 Sep 2022
That's the same example I linked to, so glad we are agreed.
It looks like the issue is you have some complex numbers in Index4. Consider using the magnitude of your values to specify color. If the values should not be complex, check how Index4 is calculated.
load matlabFarid.mat
damage.Index4 = abs(damage.Index4)
s = scatter3(damage,'wind','I','derate','filled','ColorVariable','Index4');
s.SizeData = 100;
colorbar
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