How can I keep row from index number

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Phudit Kanittasut 2021-5-1

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/818900-how-can-i-keep-row-from-index-number

回答： Image Analyst 2021-5-1

clear
Data   = readmatrix('Pure Brain Spectra.csv');
rows=length(Data)
cols=width(Data)
for i = 2:cols
    
Xlocs = Data(:,1);
Ylocs = Data(:,i);
select = [Xlocs Ylocs]; 
[value,index1] = findpeaks(select(:,i)); 
end

How can I keep the row in data with Index number from matix index1

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Image Analyst 2021-5-1

编辑：Image Analyst 2021-5-1

You forgot to attach 'Pure Brain Spectra.csv' again. I'll check back later for it.

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Phudit Kanittasut 2021-5-1

Pure Brain Spectra.csv

Thx for your advice

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Answer 1

Image Analyst 2021-5-1

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/818900-how-can-i-keep-row-from-index-number#answer_689430

在 MATLAB Online 中打开

Pure Brain Spectra.csv

There were so many errors in your code that I can't explain them all. All I'm going to do is show you how it's done.

clc;    % Clear the command window.
close all;  % Close all figures (except those of imtool.)
clear;  % Erase all existing variables. Or clearvars if you want.
workspace;  % Make sure the workspace panel is showing.
format long g;
format compact;
fontSize = 18;
Data   = readmatrix('Pure Brain Spectra.csv');
whos Data
[rows, columns] = size(Data)
Xlocs = Data(:, 1);
for col = 2 : columns
	thisColumnY = Data(:, col);
	nexttile;
	plot(Xlocs, Data(:, col), 'b-');
	[peakValues, indexesOfPeaks] = findpeaks(thisColumnY, 'Threshold', 1000);
	grid on;
	hold on
	plot(Xlocs(indexesOfPeaks), peakValues, 'rv', 'LineWidth', 2, 'MarkerSize', 7);
	caption = sprintf('Column %d', col);
	title(caption, 'FontSize', fontSize);
	drawnow;
end
hold off;
g = gcf;
g.WindowState = 'maximized'
fprintf('Done running %s.m ...\n', mfilename);

but you should really take time to understand all the options for findpeaks() because I'm not sure what you consider to be a peak or not and there are just too many of them identified if you simply go with the defaults.