How to check if a path exists

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Jason Goad
Jason Goad 2013-9-11
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.
  1 个评论
Jan
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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回答（2 个）

dpb
dpb 2013-9-11
doc exist
  3 个评论
显示 1更早的评论
dpb
dpb 2013-9-12
编辑：dpb 2013-9-12
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 2018-5-10
编辑：Rishikesh Agrawani 2018-5-10
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 个评论
Mostafa Sanusi
Mostafa Sanusi 2020-4-8
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 2020-4-8
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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