How to check if a path exists

Question

Jason Goad 2013-9-11

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https://ww2.mathworks.cn/matlabcentral/answers/86957-how-to-check-if-a-path-exists

评论： Walter Roberson 2020-4-8

I generate a path from a table using syntax that I expect and I want to be able to check if the generated path is valid. If it is not I want to add one to the index. If it is, continue on as usual.

Thanks in advance.

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Jan 2013-9-12

The question is not clear. What does "path from a table" mean? It is expected, that you use the syntay you expect. But for a discussion of occurring problems it would be useful if you post it here also. How coulöd we know which kind of "path" you mean and what how "valid" is defined. To which "index" can "one" be added (is "one" a "path" or 1.0?)? Even "continue as usual" has a meaning for you, but we cannot have the faintest idea of what you are talking about.

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Answer 1

dpb 2013-9-11

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https://ww2.mathworks.cn/matlabcentral/answers/86957-how-to-check-if-a-path-exists#answer_96498

在 MATLAB Online 中打开

doc exist

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Matt Kindig 2013-9-11

在 MATLAB Online 中打开

doc isdir ?

dpb 2013-9-12

编辑：dpb 2013-9-12

在 MATLAB Online 中打开

Works just fine if given the fully-qualified directory name the OP has just created -- example here--

>> exist('c:\temp','dir')
ans =
   7
>> exist('c:\junktemp','dir')
ans =
   0
>>

As Matt K points out,

exist('A','dir')==7

is the same as

isdir('A')

It had slipped my mind TMW has wrapped it; might as well use the "syntactic sugar" since it is already there.

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Answer 2

Rishikesh Agrawani 2018-5-10

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https://ww2.mathworks.cn/matlabcentral/answers/86957-how-to-check-if-a-path-exists#answer_319539

编辑：Rishikesh Agrawani 2018-5-10

在 MATLAB Online 中打开

I have valid path to the Desktop as C:\Users\rishi\Desktop in my Windows 10 system.

Here, I have tried to check for the existence of path elements like C:\, C:\Users (i.e. Users directory), C:\Users\rishi (i.e. rishi directory) etc.

     >> exist('C:\', 'dir')
     ans =
          7
     >> exist('C:', 'dir')
     ans =
          7
     >> exist('C:\Users', 'dir')
     ans =
          7
     >> exist('C:\Users\', 'dir')
     ans =
          7
     >> exist('C:\\Users\\', 'dir')
     ans =
          7
     >> exist('C:\\Users', 'dir')
     ans =
          7
     >> exist('C:\\User', 'dir')
     ans =
          0
     >> exist('C:\\Users\rishi', 'dir')
     ans =
          7
     >> exist('C:\\Users\RiShi', 'dir')
     ans =
          7
     >> exist('C:\\Users\rishi\Desktop', 'dir')
     ans =
          7
     >> exist('C:\\Users\rishi\Deskto', 'dir')
     ans =
          0
     >> exist('C:\\Users\\rishi\\Desktop\\', 'dir')
     ans =
          7
     >> 
     >> ret == 7
     ans =
       logical
        1
     >> if ret == 7
     disp('Directory exists')
     else
     disp('Directory does not exist')
     end
     Directory exists
     >>