How can I keep row from index number

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

[Image Analyst]

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

TUTORIAL: How to ask a question (on Answers) and get a fast answer

[Phudit Kanittasut]

Thx for your advice

Answer 1

[Image Analyst]

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.