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I having trouble displaying each value next to the correct data point on stem plot.
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Michael Andersson
on 16 Jun 2020
Commented: Star Strider
on 17 Jun 2020
I have an array of 1x20 containing the peak amplitude values and instead of displaying each text value next to the correct data point, it prints the entire array contents next to every data point.
PC = {0, NaN, -34.30, -39.90, -46.20, -47.80, -55.20, -52.20, -56.80, -60.90, -70.80, NaN, NaN, NaN, NaN, -72.80, NaN, NaN, NaN, NaN}
x=1:1:20;
subplot(3,1,3);
stem(x,RC);
text=text(x, RC, sprintf('%6.3f', RC));
set(text,'Rotation',60,'HorizontalAlignment','left','VerticalAlignment','baseline');
grid;
xlim([0, 20]);
title('Relative contribution of each harmonic ')
xlabel('Odd Harmonics');
ylabel('Contribution');
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/317064/image.png)
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Accepted Answer
Star Strider
on 16 Jun 2020
PC = {0, NaN, -34.30, -39.90, -46.20, -47.80, -55.20, -52.20, -56.80, -60.90, -70.80, NaN, NaN, NaN, NaN, -72.80, NaN, NaN, NaN, NaN}
x = 1:numel(PC);
figure
stem(x, [PC{:}], 'filled')
grid
xlim([0 20])
lbls = compose('%.2f', [PC{:}]);
text(x, [PC{:}], lbls, 'HorizontalAlignment','center', 'VerticalAlignment','top', 'FontSize',8)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/317085/image.png)
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More Answers (1)
Image Analyst
on 16 Jun 2020
I had made up this answer to your duplicate question, when you deleted it and I couldn't post it. So here it is:
v = rand(1, 40);
plot(v, 'b-', 'LineWidth', 2);
grid on;
[peakValues, indexesOfPeaks] = findpeaks(v);
hold on;
stem(indexesOfPeaks, peakValues, 'r.', 'LineWidth', 2, 'MarkerSize', 35);
for k = 1 : length(peakValues)
textLabel = sprintf('(%d, %.2f)', indexesOfPeaks(k), peakValues(k));
% Place text above the point by adding a little bit to the y value.
text(indexesOfPeaks(k), peakValues(k) + 0.05, textLabel, ...
'HorizontalAlignment', 'center', ...
'FontWeight', 'bold', ...
'FontSize', 12, ...
'Color', 'r');
end
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/317076/image.png)
We can't run the code you posted here because you didn't include RC, only PC. And if we change PC to RC, it still doesn't run.
Basically you need to put text() into a loop where you put up only one at a time.
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