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How to check if a path exists

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Jason Goad
Jason Goad on 11 Sep 2013
Commented: Walter Roberson on 8 Apr 2020
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.
  1 Comment
Jan
Jan on 12 Sep 2013
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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Answers (2)

dpb
dpb on 11 Sep 2013
  3 Comments
dpb
dpb on 12 Sep 2013
Edited: dpb on 12 Sep 2013
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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Rishikesh Agrawani
Rishikesh Agrawani on 10 May 2018
Edited: Rishikesh Agrawani on 10 May 2018
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
>>
  2 Comments
Mostafa Sanusi
Mostafa Sanusi on 8 Apr 2020
The path 'F:\' does not exist
Trying to get the MATLAB working but got this message. how to solve this issue
Walter Roberson
Walter Roberson on 8 Apr 2020
It sounds as if you do not have a drive label F: or a path mapped to F: either.
Does F: show up for you in Windows Explorer?

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