How do I get cd to work properly?

Question

Abinand Rejimon 2022-6-15

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https://ww2.mathworks.cn/matlabcentral/answers/1741385-how-do-i-get-cd-to-work-properly

评论： Abinand Rejimon 2022-6-15

I want to create a code that will parse through 15 folders (X_1, X_2, X_3) and open a subfolder folder 'Y_*' in each of these fifteen folders and open one document in the directory (example: X_1/Y_1/*.coord) I can do this easily in the command window using cd and I am able to code a for loop that will parse through the main X folders but I cannot figure out a way to open a folder with only part of the string. All of the subfolders start with Y_ but end with different numbers. I want Matlab to open the folder regardless of what number it is and only examine 'Y_'

I have tried doing this but I always get an error. How do I write this?

cd X_1/Y_*
Error using cd
Unable to change current folder to '/users/mss.system.V2roDc/Y_*' (Name is nonexistent or not a folder).

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Answer 1

Steven Lord 2022-6-15

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在 MATLAB Online 中打开

The cd function doesn't accept wildcards. You could use dir (which does) and iterate through the list of directories in its output. I would avoid actually using cd to change directory; instead use fullfile to assemble the path to the file and then pass that path into whatever file reader you're using.

d = fullfile(matlabroot, 'toolbox', 'matlab', 'general')
d = '/MATLAB/toolbox/matlab/general'
howManyFilesAndDirs = numel(dir(d))
howManyFilesAndDirs = 82
f = fullfile(d, 'bench.dat')
f = '/MATLAB/toolbox/matlab/general/bench.dat'
theText = fileread(f);
theLines = split(theText, newline);
theLines(1:5)
ans = 5×1 cell array
    {'MATLAB(R) Benchmark Data.'                                                                                       }
    {' '                                                                                                               }
    {'Copyright 1984-2022 The MathWorks(R), Inc.'                                                                      }
    {'                                                                    LU      FFT     ODE     Sparse   2-D     3-D'}
    {'Mac mini, macOS 10.15.7, Intel Core i7 @ 2.3 GHz                 1.6177  0.5956  0.7646  0.6468  0.8542  0.5738' }