How to add max and min data label of plot in matlab with help of annotation?

I want label max and min data label with use of annotation on gh bottom,middle and top plot to show the values of max and min. How to use text function here?

gh=readtable("number4.CSV")
gh = gh(gh.Time <= 4900 | ismissing(gh.Time),:);
plot(gh.Time,gh.bottom,gh.Time,gh.middle,gh.Time,gh.top)
xlim("auto")
ylim("auto")
grid on
xlim([190 1633])
ylim([23 854])
title(" cube sheet")
xlabel("Sampling rate (Hz)")
ylabel("sheet temperature (C)")
legend(["Bottom","Middle","Top"])
xy=max(gh.bottom)
xy1=min(gh.bottom)
xy2=max(gh.middle)
xy3=max(gh.top)
xy4=min(gh.middle)
xy5=min(gh.top)

Answer 1

[Cris LaPierre]

You limit you view of the data in the figure by using xlim, but not your search for max and min values. This does mean some of the max/min values may not be within the visible range of your data.

One your restrict the range of your search for max/min values, you will likely be interested in the this syntax. The 2nd output is the index of the found value. You can use this to index your time variable, allowing you to get the (x,y) data needed to plot.

[M,I] = min(___)

EDIT: Question was updated. Adding code to label points using text.

file = 'https://www.mathworks.com/matlabcentral/answers/uploaded_files/1089860/number4.CSV';
gh=readtable(file)

gh = 5900×4 table
    Time    bottom    middle     top  
    ____    ______    ______    ______

      0     43.195     41.69    32.371
      1      43.19    41.693    32.371
      2     43.186      41.7    32.371
      3     43.187    41.704    32.366
      4     43.186    41.714    32.367
      5     43.191    41.717    32.364
      6      43.19    41.721    32.364
      7     43.191    41.727    32.362
      8     43.188    41.732    32.361
      9     43.187    41.737     32.36
     10     43.191    41.745     32.36
     11     43.194    41.752    32.358
     12     43.192    41.755    32.358
     13     43.194     41.76    32.354
     14     43.197    41.764    32.356
     15     43.199    41.774    32.354

gh = gh(gh.Time <= 4900,:);
plot(gh,"Time",["bottom","middle","top"])
grid on
title(" cube sheet")
xlabel("Sampling rate (Hz)")
ylabel("sheet temperature (C)")
[mny,mni]=min(gh{:,["bottom","middle","top"]});
[mxy,mxi]=max(gh{:,["bottom","middle","top"]});

hold on
plot(gh.Time(mni),mny,'^')
plot(gh.Time(mxi),mxy,'*')
hold off

text(gh.Time(mni),mny,'min')
text(gh.Time(mxi),mxy,'max')
legend(["Bottom","Middle","Top"])