How do I import file names that change in a loop?

Question

Franchesca 2014-5-12

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https://ww2.mathworks.cn/matlabcentral/answers/129333-how-do-i-import-file-names-that-change-in-a-loop

编辑： dpb 2014-5-13

I need to import Trial01, Trial02 and so on then Trial10, Triall11 but how do I define the 0 in the first 9 trails from 1 to 9 then not from 10 to 54?

This is my code to import the data:

%% Import data

numfiles = 54; % number of excel files mydata=cell(numfiles,1); % defining size of mydata d=dir('Trial*.csv');

for i=7:length(mydata) % loop to import mutliple excel files

try
  mydata{i} = xlsread(d(i).name); % import files into mydata
catch
  disp([d(i).name 'read failed'])
end
  myfilename = sprintf('Trial%i.csv', i); % define file name 
  mydata{i} = xlsread(myfilename); % import files into mydata

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dpb 2014-5-12

编辑：dpb 2014-5-13

在 MATLAB Online 中打开

Again, I suggest just modify your present use of dir slightly instead.

It's well to know the format string to generate the place-holding 0 in a numeric field, and there are times when it's about the only choice but here there's still a very convenient wildcard pattern that works and it's still more work to generate names for existing files and you then have the problem of there may not be every one extant and you're back to a similar problem as that you have in the other thread of skipping empty content.

It does sometimes take a little creativity to get the right wild card--in this case,

d=[dir('Trial0?.csv');dir('Trial1?.csv')];

will return the values you want by concatenating the two directory structures for those from 00 thru 09 and 10-19, respectively. You can also get more exotic using post processing to eliminate those you don't want from a full dir() as an example is given in the doc's.

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