for loop- plot max values by defining x length either side

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Hello

I am having problems figuring out how to undertake a particular task. I have an array made up ofdatenumbers and corresponding values (747840,2).

What I want to do is to make a plot for each max value (but not for just one value!). Basically, I need to get hold of the values surrounding the max value - so either side by x length (say 6 days), then make plots like this.

I can index the position of the max values like ...

[a,b] = find(A(:,2) >= 5.0); % so a contains the row numbers of each value of interest

then I would I would like to make a loop where I make a plot centered on this value, but with the additional values from the original array either side too..(Hope that makes sense!!)

Thanks!!!

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Jasmine 2014-7-16

To clarify, the max value we are talking about is with regards to the corresponding values and not the date numbers? Then having got the maximum value, which may occur several times (and we want to know about all occurrences), we need to be able to extract the other dates and corresponding values for, say, 6 days either side of the maximum value dates. Then having got this information we want to plot date against corresponding value with the maximum value in the middle. Does this mean you want several graphs (separate windows or sub-plots) or all maximums plotted on the same axis?

Harry 2014-7-16

Hello Jasmine

Thanks for the reply. I managed to work it out !

For the record, yes I was wanting the max values from corresponding values, then plotting these in multiple windows (with a loop) with corresponding values from 6 days either side of the max value (based on datenumber values). Thanks for the speedy response!

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Answer 1

Joseph Cheng 2014-7-16

在 MATLAB Online 中打开

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well you could do something like this in one window

t=0:1:700;
A = [t' 5.1*sin(t/10)']
[row]=find(A(:,2)>=5.0);
figure,hold on
cline = hsv(length(row));
for locMax = 1:length(row)
    if row(locMax)<7
        plotted = A(1:13,:);
    elseif row(locMax)>length(A)-6
        plotted = A(end-12:end,:)
    else
        plotted = A(row(locMax)-6:row(locMax)+6,:);
    end
      plot(plotted(:,1),plotted(:,2),'.-','color',cline(locMax,:))
  end

or instead of a hold on for the plot, use subplot

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