export the data of the plot to .txt or .dat file

I have the following code and I got a plot from the data. I wanted to export the data in the plot to .txt file or a .dat file

clear
[filename, pathname] = uigetfile('*.raw;*.prc', 'Pick raw or processed data file');
N=str2double(filename(5:6));
% load processed file
fid = fopen([pathname filename],'r','b');
A= fread(fid,inf,'*single')';
prcdata=reshape(A,N,[])';
plot((1:size(prcdata,1))./1.16E6, prcdata (:,6))
fclose(fid);
% code
end

I also tried the following

csvwrite(filename,M,'','6')
figure1 = figure;
axes1 = axes('Parent',figure1)
hold(axes1,'all');
plot((1:size(prcdata,1))./1.16E6, prcdata (:,6))
saveas(figure1,'finename.jpg')  % here you save the figure
title(strrep(filename,'Time','Amplitude'))

Answer 1

[Walter Roberson]

x = (1:size(prcdata,1))./1.16E6;
y = prcdata;
xy = [x(:), y(:)];
dlmwrite('YourOutputFile.txt', xy, 'delimiter', ',');

[Annonymous User]

got the error when I ran the code Error using horzcat Dimensions of matrices being concatenated are not consistent. Error in SJ4 (line 12) xy = [x(:), y(:)];

[Image Analyst]

y should be prcdata(:, 6) so that y(:) is the same number of elements as x. Otherwise it's all the elements of y -- all columns, which will be way more than the number of rows.

[Walter Roberson]

y = prcdata(:,6);

[Annonymous User]

thank you walter and Image analyst will test this out

[Annonymous User]

This code worked it took almost an hour to analyse the data and export it.

Answer 2

[Image Analyst]

Well, neither of those two chunks of code does anything at all like writing the array to a text file! Try this:

filename = 'My Output file.txt'; % Whatever
fid = fopen(filename, 'wt');
if fid ~= -1
    fprintf('%f\n', prcdata(:,6)); % Write out column 6 of prcdata.
    fclose(fid);
else
    message = sprintf('Could not open file %s for writing', filename);
    uiwait(warndlg(message));
end

[Annonymous User]

I wanted to export the data I obtained in this graph to .txt format

%% plot((1:size(prcdata,1))./1.16E6, prcdata (:,6))

when I run the code you suggested it plots the entire prcdata's column 6 Any suggestions?

[Image Analyst]

Well, yeah. You plotted prcdata's column 6. You said you wanted what you plotted to go into a text file. So, the code does that. Why do I need to give another suggestion when it does exactly what you asked for. Did you also want the x values on each line of hte text file in addition to the y values?

[Annonymous User]

I divided the prc data with 1.16E6 and got the graph I wanted to save the column 6 of prc data which I plotted after I divided the prc data. when I ran this code the entire prc data was being plotted

[Annonymous User]

I want the x values of the graph as well to save to .txt file

[Image Analyst]

x = (1:size(prcdata,1)) ./ 1.16E6;
xy = [x(:), prcdata(:,6)];
fprintf('%f, %f\n', xy); % Write out column 6 of prcdata.

[Annonymous User]

is that to go with your previous code???

[Image Analyst]

Yes, put those 3 lines instead of the single fprintf() from before.

[Annonymous User]

the code is still running modified as you suggested... its a huge data... will let u know if it worked

[Annonymous User]

This code worked it took almost an hour to analyse the data and export it.

[Image Analyst]

It should not take that long unless you have hundreds of gigabytes of data.

[Annonymous User]

the data I had was around 6GB that too had 5 files each... so took almost 2 days to write the whole thing into a file thank you