How to make a .csv file with data values in .txt

Hallo,

I have a data .txt file with values as below,

0.000000e+00 0.000000e+00

1.005346e-04 1.842308e-20

2.006482e-04 6.750698e-20

3.000943e-04 3.313659e-19

4.002079e-04 6.749189e-19

5.003215e-04 1.001656e-18

6.004351e-04 1.332393e-18

7.005486e-04 1.622378e-18

8.006612e-04 3.978657e+01

9.001020e-04 2.101415e+03

1.000211e-03 5.359804e+03

1.100320e-03 8.372647e+03

I need to split them with some delimiter and export it to a .csv file with two columns so that I can plot the graph with Column 1 as X and Column two as Y.

Can anyone help me how to do it ?

Matlab R2015b

Answer 1

[Star Strider]

If you want to read your file using readtable, you need to do some processing on it afterwards:

T = readtable('data.txt','ReadVariableNames',0);
T(1:3,:) = [];
T1 = varfun(@str2double,T);
T1.Properties.VariableNames = {'X','Y'};

figure
plot(T1.X, T1.Y)                                        % Plot Table
grid

Note that ‘T’ imports the numerical data as strings, so you need to convert them to numerical variables to use them.

You can also use textscan to read it:

fidi = fopen('data.txt');
for k = 1:3
    hdrs{k} = fgetl(fidi);                              % Read & Store Headers
end
C = textscan(fidi,'%f%f', 'CollectOutput',1);           % Read & Store Numerical Data (Cell Array)
fclose(fidi);
D = cell2mat(C);                                        % Store Numerical Data As Matrix (Optional)

figure
plot(C{:}(:,1), C{:}(:,2))                              % Plot Cell Array
grid

figure
plot(D(:,1), D(:,2))                                    % Plot Matrix
grid

I would just leave your file as it is, however. If you want to store only the numerical values, just save (link) it as a .mat file.

Answer 2

[madhan ravi]

T = readtable('data.txt');
T1 = str2double(table2cell(T));
csvwrite('Wanted.csv',T1(~all(isnan(T1),2),:))
% after this the csv file can be read and it can be plotted

W = csvread('Wanted.csv');
plot(W(:,1),W(:,2))

[Jaffrey Hudson Immanuel Jeyakumar]

Hallo Madhan,

I have run the script. I get a following error, Do you get this error ?

Error using dlmread (line 143)

Empty format string is not supported at the end of a file.

Error in csvread (line 47)

m=dlmread(filename, ',', r, c);

Error in test2 (line 9)

W = csvread(wanted);

Regards,

Jaffrey Hudson

[Jaffrey Hudson Immanuel Jeyakumar]

data= 'xxxxxxxxxxx\data.txt';

wanted='xxxxxxxxxxx\wanted.csv';

T = readtable(data);

T1 = str2double(table2cell(T));

csvwrite(wanted,T1(~all(isnan(T1),2),:))

% after this the csv file can be read and it can be plotted

W = csvread(wanted);

plot(W(:,1),W(:,2))

This was my script and the error was

Warning: Variable names were modified to make them valid MATLAB identifiers.

Error using dlmread (line 143)

Empty format string is not supported at the end of a file.

Error in csvread (line 47)

m=dlmread(filename, ',', r, c);

Error in test2 (line 9)

W = csvread(wanted);

[madhan ravi]

No I didn't have any error messages

Answer 3

[Mingde]

Hello,

I would like to segment data in matlab by cutting or removing the text from csv file. I want to get only the new data as csv file after remove text.

finally, I want to get the csv data without text.