How can I add the percentage result on plotted figure ?

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Onur Hakverdi
Onur Hakverdi 2021-6-22
编辑： Walter Roberson 2021-6-24
Hi I have this code. Everything is fine, the code plots wavelength-intensity relationship according to the csv data and it labels the peak point. So my question is I have a formula for the percentage. It's (intensity/intensity_max)*100 so I need to add a text code that will solve the equation and it will show the result for every if and elseif state on the figure.

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回答（2 个）

Alan Stevens
Alan Stevens 2021-6-22
doc text
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Alan Stevens
Alan Stevens 2021-6-22
You have intensity values at all waveengths!
Since the first "if" section just considers intensity_max, not intensity, I guess you want to calculate
(intensity_max/345.1)*100.
If so, then do something like:
pc = (intensity_max/intensity)*100;
then after your plot command do something like
text(x,y,num2str(pc))
where you choose x and y as suitable coordinates to place the value where you want on the graph.
Onur Hakverdi
Onur Hakverdi 2021-6-22
my x and y coordinates are undefined so I don't know the values because it's randomly data.

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Steven Lord
Steven Lord 2021-6-22
Ran in:
FYI if you want the only marker to be at the highest point you could use MarkerIndices rather than plotting two separate lines.
x = 1:100;
y = 20*rand(size(x));
[~, ind] = max(y);
plot(x, y, 'o-', 'MarkerFaceColor', 'r', 'MarkerIndices', ind)
I'm not 100% sure of what you're looking for, but do you want to have lines across the plot indicating when the values are in certain ranges?
figure
plot(x, y, 'o-', 'MarkerFaceColor', 'r', 'MarkerIndices', ind)
hold on
yline(10, 'Label', 'halfway point');
yline(5, 'Label', 'quarter of the way through')
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Onur Hakverdi
Onur Hakverdi 2021-6-23
hi problem with the x y coordinates because my coordinates are unknown it depends the data.
Walter Roberson
Walter Roberson 2021-6-24
编辑：Walter Roberson 2021-6-24
txt = sprintf('ratio = %.2f', (intensity/intensity_max)*100);
title(txt)

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