how to save the data in csv file from the plot

Hi,

I am using the code below for extracting the wanted data from few excel files then plotting the extracting data but I am unable to save the plotted data into excel file. Can you guys help, please?

Code So Far:

% To access the folder

    folder = fullfile('C:','Users','muhammad','Documents','1st_Yr','Experiments_2021','performance_110');
    files = dir( fullfile(folder, '*.ods') );

    % Reading and extracting data from 12 excel files hence plotting

    for ii = 1:length(files)
         data = readmatrix(fullfile(files(ii).folder,files(ii).name), 'NumHeaderLines', 1)
         x= data(:,10)
         y=data(:,4)
         figure(1)
    % Plotting data

    plot(x,y,'x','LineWidth',0.5);
    hold on
    end 

[Walter Roberson]

Could you explain further what you mean about saving hte plotted data into excel file? Are you asking to write a plot into Excel, so that when you went into Excel you would see the plot ?

[muhammad choudhry]

In the plot, I have plotted column 4 and 10 from the excel files (12). I want to save them extracted columns which I plotted into new excel file so I can further work on the data as few things need to be fixed, (want to avoid manual copy and pasting). Thanks

[Walter Roberson]

It sounds like you want to save them numerically.

As you are processing a number of files, how do you want the values from one file to be arranged relative to the values for another file? For example are you wanting to write each one to a separate sheet? Are you wanting to write 2 * length(files) separate columns, alternating X and Y? (If so is it possible that different files are not the same size as each other?) Are you wanting to write all of the data together as a pair of columns, all of the first file then all of the second file, and so on? If so then how do you want to mark the boundary between files? Do you want to store the file name for every row? Do you want to store a "group number" (which in this case would be ii) for each row ?

[muhammad choudhry]

I want to write the data in the following format:

column 4 and 10 from the file one

then column 4 and 10 from file 2

all them columns need to be saved into one separate file(in one sheet), column by column (column data are not of same size, they are different in length), yes all the data as a pair of column all of the first then second correct and so on correct!. Well, for now I do not need to mark the boundary between each file because they are random point generated using experimental trials and moving forward I want to fit the LOWESS estimation curve to them to see how well or close them points to each other.

Answer 1

[KALYAN ACHARJYA]

Options:

1. The plot is a figure, you can save as Matlab .fig files (Use save as option)
2. Save the figure plot result as an image (imwrite)
3. If you wish to save x & y numeric data, create a vector as follows & save using writematrix function (Excel/CSV)

          result=[x_column_data,y_column_data]
          writematrix(result,......) %see the write matrix Matlab Doc 

[muhammad choudhry]

hi,

thanks for the help. I follow the doc and write the result into the file all good but it is only writting one set (last) of data from the plot not everything as I have around data of 12 plots on the graph.

result =[x,y]

writematrix(result,'M.csv')

[Walter Roberson]

You can use 'writemode', 'append' for writematrix()