Why does this code generate an error?

Question

Chaitanya Bade 2017-4-5

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/333773-why-does-this-code-generate-an-error

评论： the cyclist 2017-4-6

采纳的回答： the cyclist

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Hi all,

The below code is generating an error :

The code used here is:

%BATCH MODE
files = dir('C:\Users\Deakin Uni\Documents\MATLAB\a');
fNames = {files.name};
%for each file
for k= 1: length(fNames)
     % extract file name
     fName = ['C:\Users\Deakin Uni\Documents\MATLAB\MAX', fNames{k}];
     [XDATA, TIMESTEPS] = importfile(fName);
  a1 = XDATA - mean (XDATA);
  plot(TIMESTEPS, a1);
  [peakvals,peaklocs] = findpeaks(a1, 'minpeakdistance',50, 'minpeakheight', 0.00001);
  peaktime = TIMESTEPS(peaklocs);
  createfigure4(TIMESTEPS, a1, peaktime, peakvals)
  saveas(gcf, 'chaitu.fig')
  end

The error here is: Error using xlsread (line 132) XLSREAD unable to open file 'fName'. File 'fName' not found.

Error in importfile (line 36) data = xlsread(workbookFile, sheetName, sprintf('A%d:B%d',startRow(1),endRow(1)));

Thanks in advance

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Adam 2017-4-5

What is in fNames when you step through the code in the debugger?

Chaitanya Bade 2017-4-5

编辑：the cyclist 2017-4-5

在 MATLAB Online 中打开

Sorry mate, just realized there were some issues with my directory folder. Have made changes. It's working now. However, it is not running the loop. Just generating solution for the first file and that's it. Wondering if you can help. Thanks!

%BATCH MODE
files = dir('C:\Users\Deakin Uni\Documents\MATLAB\a\*CA90-Wb0R0-00015MAX-X*');
fNames = {files.name};
%for each file
for k= 1: length(fNames)
     % extract file name
     fName = ['C:\Users\Deakin Uni\Documents\MATLAB\a\', fNames{k}];
     [XDATA, TIMESTEPS] = importfile(fName);
  a1 = XDATA - mean (XDATA);
  plot(TIMESTEPS, a1);
  [peakvals,peaklocs] = findpeaks(a1, 'minpeakdistance',50, 'minpeakheight', 0.00001);
  peaktime = TIMESTEPS(peaklocs);
  createfigure4(TIMESTEPS, a1, peaktime, peakvals)
  saveas(gcf, 'chaitu.fig') 
  end

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Answer 1

the cyclist 2017-4-5

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/333773-why-does-this-code-generate-an-error#answer_261838

在 MATLAB Online 中打开

Presumably, the cause is that for some value of k,

['C:\Users\Deakin Uni\Documents\MATLAB\MAX', fNames{k}]

does not resolve to a string that corresponds to a file name in that directory.

I suggest you display the name of each file as you try to access it, and that should lead you to the specific file name that is problematic.

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Chaitanya Bade 2017-4-6

编辑：Chaitanya Bade 2017-4-6

@the cyclist: if i put disp(k), it just shows the first file. I wanted to run a loop among all the files within the directory. And it does not show any error. I have got the solution for the first file. But not for the other two files. And the value of length(fNames) is 3.

the cyclist 2017-4-6

Nothing stands out to me (after admittedly not very intense scrutiny). Are you familiar with the ability to enter debug mode? I suggest you use that to step through your program line-by-line from k==1, and see if the values of the variables are what you expect them to be. This should give a clue about what went wrong.

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