fopen is returning ''

2 次查看（过去 30 天）
Mohan
Mohan 2011-11-22
Hello,
While I am trying to open a file using fopen the file id is returning ''.
I am attaching the error here, when using the whole file location it is working fine but when giving variables its not.
fopen(strcat(DirPath,'/',SbjList{1}(1,:),'/',SbjList{2}(1,:),'/FREESURFER/stats/aseg.stats'))
ans =
''
K>> strcat(DirPath,'/',SbjList{1}(1,:),'/',SbjList{2}(1,:),'/FREESURFER/stats/aseg.stats')
ans =
'/raid6/data9/CSP4REST/FS5.1_RES_5/5002/tp1/FREESURFER/stats/aseg.stats'
K>> fopen('/raid6/data9/CSP4REST/FS5.1_RES_5/5002/tp1/FREESURFER/stats/aseg.stats')
ans =
12

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回答（2 个）

Walter Roberson
Walter Roberson 2011-11-22
strcat() is returning a cell array that contains the string. You cannot fopen() a cell array.
I would suspect that DirPath is a cell array containing one string.
I suggest you use
[fid, message] = fopen(strcat(DirPath,'/',SbjList{1}(1,:),'/',SbjList{2}(1,:),'/FREESURFER/stats/aseg.stats'))
and look at the message generated.
If I am correct in my suspicion, changing to DirPath{1} should fix the problem.
Mohan
Mohan 2011-11-22
Hello Walter,
Thanks for the information but still when I debugging it, DirPath is just a variable having the path. When I give it in command window the following result popped up.
K>> DirPath
DirPath =
/raid6/data9/CSP4REST/FS5.1_RES_5.
and when I give DirPath{1} it showed an error
??? Cell contents reference from a non-cell array object.
and when I used [fid, message], both of them returning null ('').
  1 个评论
Walter Roberson
Walter Roberson 2011-11-22
In any case, the strcat() is returning a cell array. You can see that by examining your output and examining the output differences for the following two expressions:
'Hello'
{'Hello'}

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