Plot label with text function

Question

Doyinsola 2023-12-27

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2064546-plot-label-with-text-function

评论： Star Strider 2023-12-28

采纳的回答： Star Strider

matlab_data.mat

在 MATLAB Online 中打开

Hi everyone, please help debug the error in the code below

I made a plot in which I added a text to each peaks (peak assignment with label) but the alignment of the text are not well placed accordingly. See below my script and the plot generated with the script. I want the text label to be close to each of the peaks identified. I also attached the data I plotted. Thanks

NB: 'Si_layer1_ExpN' is my experimental data which represent intensity, 'wv1' is the wavelenght of my experimental data and 'matched data' (struct) is the result of the comparison I did with my experimental data using a database.

script

figure;
plot(wv1, Si_layer1_ExpN, 'b', 'LineWidth', 1);
hold on
for i = 1:length(matched_data)
    plot(matched_data(i).wavelength, matched_data(i).intensity, 'ko', 'MarkerSize', 5);
    text(matched_data(i).wavelength, matched_data(i).intensity, matched_data(i).labels, 'VerticalAlignment', 'bottom', 'HorizontalAlignment', 'left', 'Color', 'k');
end
xlabel('Wavelength (nm)');
ylabel('Intensity');
legend('Experimental Data', 'Matched Peaks');

The script return first plot below

I want the peak labelling to look like the below plot. Labels placed close to each peaks.

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Answer 1

Star Strider 2023-12-28

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2064546-plot-label-with-text-function#answer_1378956

在 MATLAB Online 中打开

matlab_data.mat

All the ‘matched_data.intensity’ entries are all set to 1, so they all plot at 1 rather than the peak values. A way to correct for that is to add this interp1 call to the loop before the others:

matched_data(i).intensity = interp1(wv1, Si_layer1_ExpN, matched_data(i).wavelength);

That interpolates the correct values, based on the ‘matched_data.wavelength’ values. No other changes to your code are necessary.

Try this —

load('matlab_data.mat')

% whos

figure;

plot(wv1, Si_layer1_ExpN, 'b', 'LineWidth', 1);

hold on

for i = 1:length(matched_data)

matched_data(i).intensity = interp1(wv1, Si_layer1_ExpN, matched_data(i).wavelength);

plot(matched_data(i).wavelength, matched_data(i).intensity, 'ko', 'MarkerSize', 5);

text(matched_data(i).wavelength, matched_data(i).intensity, matched_data(i).labels, 'VerticalAlignment', 'bottom', 'HorizontalAlignment', 'left', 'Color', 'k');

end

xlabel('Wavelength (nm)');

ylabel('Intensity');

legend('Experimental Data', 'Matched Peaks');

.

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Doyinsola 2023-12-28

Thank you. This really solved my many trial and errors with ease. Thank you once again.

Star Strider 2023-12-28

As always, my pleasure!

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Answer 2

the cyclist 2023-12-27

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2064546-plot-label-with-text-function#answer_1378916

编辑：the cyclist 2023-12-27

在 MATLAB Online 中打开

matlab_data.mat

The intensities in your structure do not line up with the variable Si_layer1_ExpN.

I show this below by splitting figure into two subplots, and making your plot markers bigger:

load("matlab_data.mat")

figure

tiledlayout(2,1)

nexttile

plot(wv1, Si_layer1_ExpN, 'b', 'LineWidth', 1);

nexttile

hold on

for i = 1:length(matched_data)

plot(matched_data(i).wavelength, matched_data(i).intensity, 'ko', 'MarkerSize', 8);

text(matched_data(i).wavelength, matched_data(i).intensity, matched_data(i).labels, 'VerticalAlignment', 'bottom', 'HorizontalAlignment', 'left', 'Color', 'k');

end

xlabel('Wavelength (nm)');

ylabel('Intensity');

Notice that the two y-axes have very different ranges.

I'm not sure how you want to solve that, so I'll leave it at that.