How do I select a file to open from folder rather than typing in the csv file name into the code?

Hello, I have the following code where I put in the filename of interest to plot the data into the code. It would much things much quicker and easier if, when I run the code, it opens a folder selection window and then I can select the file or files of interest. How do I open a folder and select a file or files for my plots? Thanks so much!

%Insert csv file name of interest
Pswpdata = readtable('csv_file.csv');

%Compute the max values by the groups of Frequency Variable
T1 = groupsummary(Pswpdata, 'Frequency', 'max');

%Find the indices of the variables to be added
names = Pswpdata.Properties.VariableNames;
str = {'Gain','PAE','PLRF_dBm'};
%Adding 1 to the indices as the output by groupsummary() has an extra
%column for groupcounts
idx = find(ismember(names, str)) + 1;

%Plot the corresponding values 
scatter(T1,'Frequency',idx,'filled')
hold on
grid on
legend('Location', 'Best')
title('GT,PAE & Pout (dB)')

Answer 1

[Les Beckham]

Check the documentation on uigetfile which will return the filename and, if you use the two output version, the path to the file selected by the user from a file browser type dialog. For example:

[fn, fpath] = uigetfile;
Pswpdata = readtable(fullfile(fpath, fn));

[Michael]

Thank you!!!

However, I am receiving a couple errors. I can select the file but then I see this error.

>> Test_v2

Error using readtable

Unable to find file. Ensure file exists and path is valid.

Error in Test_v2 (line 3)

Pswpdata = readtable(fullfile(fn, fpath));

%Select file to plot
[fn, fpath] = uigetfile;
Pswpdata = readtable(fullfile(fn, fpath));

%Compute the max values by the groups of Frequency Variable
T1 = groupsummary(Pswpdata, 'Frequency', 'max');
%Find the indices of the variables to be added
names = Pswpdata.Properties.VariableNames;
str = {'Gain','PAE','PLRF_dBm'};
%Adding 1 to the indices as the output by groupsummary() has an extra
%column for groupcounts
idx = find(ismember(names, str)) + 1;
%Plot the corresponding values 
scatter(T1,'Frequency',idx,'filled')
hold on
grid on
legend('Location', 'Best')
title('GT,PAE & Pout (dB)')

[Gabor Kovacs]

See the examples in the uigetfile help: https://uk.mathworks.com/help/matlab/ref/uigetfile.html#d126e1714585

The first output is the file name, the second output is the path. Therefore when you use it in fullfile, you need to change the order (i.e.: path, then file name).

[Michael]

Wonderful! Thank you so much!

[Les Beckham]

Good catch, Gabor. Thanks.

Sorry about that, @Michael. I will edit my answer to correct that mistake. If this solved your issue, please consider clicking to Accept it.

[Michael]

Yes, this solved the problem. Thanks everybody!

[Les Beckham]

You are quite welcome.