MATLAB Answers

how to use the data from .dat file for plotting graph

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Siddharth Pande
Siddharth Pande on 3 Jun 2014
Commented: Star Strider on 17 Nov 2014
I generated a data file in .dat form using a spice tool now I want to call this data file in matlab and use the x and y coordinates from the data file to plot the data in matlab .I am attaching the file having my data it is in txt format now as the attachments doesn't accept .dat format so anyone working with my file plz change the extension to .dat.


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Answers (2)

Star Strider
Star Strider on 3 Jun 2014
I do not know if this would work for ‘.dat’ files, but it works for the ‘.txt’ file you posted:
T = readtable('switch.txt', 'HeaderLines', 5, 'Delimiter','\t','ReadVariableNames',false);
Time = T.Var2;
iv1 = T.Var3;
plot(Time, iv1)


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Star Strider
Star Strider on 3 Jun 2014
I haven’t used textscan since readtable appeared. This should work:
filename = 'switch.txt';
dfin = fopen(filename, 'r'); % Open data file for reading
datin = textscan(dfin, '%f %f %f', 'HeaderLines',5); % Read data, skip 5 header lines
Time = cell2mat(datin(2)); % Define variables
iv1 = cell2mat(datin(3));
The plot call doesn’t change, nor does the plot.
Siddharth Pande
Siddharth Pande on 4 Jun 2014
thanks a lot for your help i had to make a little modification ,it worked thanks again
Star Strider
Star Strider on 4 Jun 2014
My pleasure!
(The sincerest form of appreciation here on MATLAB Answers is to Accept the Answer that most closely solves your problem.)

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Daniel on 17 Oct 2014
Hi guys, I have a similar problem. I saved some data in a .dat file. I can load the data to matlab and it saves it in an array but I don't know how to plot a graph using the data. Any help would be appreciated.


Siddharth Pande
Siddharth Pande on 17 Nov 2014
download my txt file now take star strider's code to the command line of matlab and see how it works try to use matlab 2013. as text scan function is provided in latest version
if you get any idea from it then you could simply chang yours
be sure when working with your file change the .dat file to .txt and run the code search for cell2mat function and textscan function in matlab help
Star Strider
Star Strider on 17 Nov 2014
@Siddharth Pande —
I very much appreciate your recommending my Answer. Now would your please Accept it?

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