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Error using textscan Invalid file identifier Use fopen to generate a valid file identifier in app designer
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I use a button to upload my "Data.txt" file and another button to calculate and plot it into UIaxes but im having error in "fid=fopen"
properties (Access = public)
selectpath='';
end
% Callbacks that handle component events
methods (Access = private)
% Button pushed function: UploadButton
function UploadButtonPushed(app, event)
[file,path] = uigetfile('*.txt')
end
% Button pushed function: CalculateButton
function CalculateButtonPushed(app, event)
fid=fopen(Data.txt(app.selectpath));
fclose(fid); %Error using textscan
% Invalid file identifier.
% Use fopen to generate a valid file identifier.
seek=textscan(fid,'%f %f','headerlines',2);
g = cell2mat(seek);
x=g(:,1);
y=g(:,2);
[sortedX, sortIndex] = sort(x);
sortedY = y(sortIndex);
sortedXLimit = sortedX(1:160,:);
sortedYLimit = sortedY(1:160,:);
plot(app.UIAxes,value*peaks) %for the graph
app.UIAxes.YLim = [0 205];
5 Comments
Accepted Answer
Tommy
on 30 Apr 2020
Edited: Tommy
on 30 Apr 2020
It doesn't seem like your upload button stores anything. It saves the file and path into file and path and then exits, at which point the file and path are lost. This would work:
function UploadButtonPushed(app, event)
[file,path] = uigetfile('*.txt');
if file == 0
% handle case where user clicks cancel
else
app.selectpath = fullfile(path, file);
end
end
And then in your other callback:
function CalculateButtonPushed(app, event)
fid=fopen(app.selectpath);
seek=textscan(fid,'%f %f','headerlines',2);
...
10 Comments
Tommy
on 1 May 2020
Hmm... I'll assume you want to plot your sorted and trimmed y over your sorted and trimmed x, in which case you should try
plot(app.UIAxes,sortedXLimit,sortedYLimit)
If that's not what you want, could you provide the code which worked for you?
More Answers (1)
sydney salvador
on 1 May 2020
2 Comments
Tommy
on 1 May 2020
At this point I'd recommend you open a new question. If you do so, post a link here and I'd be more than happy to take a look!
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