Trying to change colours on the the same plot, but getting error message 'There is no b property on the Line class'

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Cameron Kirk
Cameron Kirk 2019-12-11
回答： Cameron Kirk 2019-12-12
I am trying to create a plot which has all of the values negative values below 0 in red, and those positive, above 0 in blue.
However when I try to do this using 'b' for blue and 'r' for red, I am met with the message 'There is no b property on the Line class'
Unsure of where I'm going wrong if someone could please assist
figure((iSubject-2)*100 + (iTest-4)*10 + (iGroup-2))
subplot(511)
plot(acc(:,1))
title('lower back')
positiveIndexes = 2 >= 0;
negativeIndexes = 2 <= 0;
hold on
plot(acc(:,1),(positiveIndexes),'b',1)
plot(acc(:,1),(negativeIndexes),'r',1)

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采纳的回答

ME
ME 2019-12-11
The issue with your plotting command is that matlab is interpreting the 'b',1 part as a pair of commands (i.e. ste the property named b equal to 1). At present the 1 won't be doing anything - what was the purpose of the 1?
If you get rid of the ,1 at the end of your plotting command then it will plot in the right colours.

更多回答（1 个）

Cameron Kirk
Cameron Kirk 2019-12-12
Thanks for that, I was trying to mirror a code from someone else, so that one wasn't needed!

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