How to pick specific points and mark them on a plot?

Question

Marian 2013-10-15

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https://ww2.mathworks.cn/matlabcentral/answers/90292-how-to-pick-specific-points-and-mark-them-on-a-plot

评论： Marian 2013-10-16

Hi, I currently have an array that is finding temperature differences between two sets of quality controlled data. I have no problem finding these temperature differences and plotting them, but I'd like to know if there is a way for me to mark where there is at least a one degree difference? so:

%temp is time series object with temperature differences

plot(temp)

for i=1:length(temp)

if temp(i)>1 temp(i)<-1

       ((mark this on the plot))
    end
end

Thanks!

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Answer 1

Vivek Selvam 2013-10-15

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https://ww2.mathworks.cn/matlabcentral/answers/90292-how-to-pick-specific-points-and-mark-them-on-a-plot#answer_99774

在 MATLAB Online 中打开

Hi Marian

Add this snippet:

hold on; 
plot(i,temp(i),'*')

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Marian 2013-10-16

It appears to be plotting the timeseries and then plotting the '*' further down the axis, instead of on top of the time series. Is there any way I can "get" the elements of the timeseries itself? In other words, instead of using temp, could I use my time series object for temp, ts5, in this for loop? It tells me I cannot just use ts5(i), as it is an undefined function for time series.

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