Add text to plot using a loop

I am plotting FTIR data. The code below should work, but I have substituted in randomly generated data.

I'd like the text function in the loop to produce a label for each plot. i.e., p1(1) will be labelled pre-sorption, and p1(5) will be labelled 'SiO2 = 2 mM'. Currently, the code produces text in the right position, but all five labels appear at all five locations. How do I modify the code to make sure each label appears sequentially?

Thanks!

AM_cm=([400:1:4000]);
AM_cm=AM_cm.';
AM=([rand(3601, 1) rand(3601, 1) rand(3601, 1) rand(3601, 1) rand(3601, 1)]);

figure(1);
set(gca,'Xdir','reverse');
set(gca,'ytick',[]); set(gca,'yticklabel',[]);
xlabel ('cm-1','Fontsize', 14); ylabel ('Absorbance','Fontsize', 14); 

for a = 1:5% FTIR data
    hold on; box on;
    p1(a)=plot(AM_cm,AM(:,a),'-','LineWidth',2);
    text(3900, AM(1,a),['pre-sorption','SiO2= 0.5 mM','SiO2 = 1 mM','SiO2 = 1.5 mM','SiO2 = 2 mM'],'Fontsize', 12);
end 

[Rosalie Tostevin]

Note: The text appears in stupid places in the code above, because the data are random, but the positions make sense in my code. I am just interested to know how to print one label per plot!

[Dyuman Joshi]

Do you want a legend?

[Rosalie Tostevin]

I'd rather label the lines than have a legend, because they are all the same colour.

Answer 1

[Walter Roberson]

AM_cm=([400:1:4000]);
AM_cm=AM_cm.';
AM=([rand(3601, 1) rand(3601, 1) rand(3601, 1) rand(3601, 1) rand(3601, 1)]);

figure(1);
set(gca,'Xdir','reverse');
set(gca,'ytick',[]); set(gca,'yticklabel',[]);
xlabel ('cm-1','Fontsize', 14); ylabel ('Absorbance','Fontsize', 14); 

labels = {'pre-sorption','SiO2= 0.5 mM','SiO2 = 1 mM','SiO2 = 1.5 mM','SiO2 = 2 mM'};
for a = 1:length(labels)% FTIR data
    hold on; box on;
    p1(a)=plot(AM_cm,AM(:,a),'-','LineWidth',2);
    text(3900, AM(1,a),labels{a},'Fontsize', 12);
end 

[Rosalie Tostevin]

This works, thank you!