databanao Index exceeds matrix dimensions. Error in databanao (line 18) X=imread([​'./mydata/​',person_n​ame,'/',pe​rsonconten​ts(face_in​dex,1).nam​e]);

datacontents=dir('./mydata');
mainDatabase=cell(0,0);
personno=0;
imi=0;

for person=1:length(datacontents)
 if person<3
   continue;
 end;

score1=0;
personno=personno+1;
person_name=datacontents(person,1).name;
mainDatabase{1,personno}= person_name;
personcontents=dir(['./mydata/',person_name,'/*.pgm']);

for face_index=1:5
X=imread(['./mydata/',person_name,'/',personcontents(face_index,1).name]);
imi=imi+1;
mainDatabase{3,imi}=X;
[cA1,cH1,cV1,cD1]=dwt2(X,'sym4');
[lll,llh,lh1,lhh]=dwt2(cA1,'sym4');
[COEFF,SCORE,latent]=princomp(111);
score1=score1+SCORE;
end

scor1=score1(:,1)/5;
  mainDatabase{2,personno}=scor1;
end

j=1;

figure1=figure(1);

set(figure1,'name','Database');

for image=1:25

   subplot(5,5,image),imshow(mainDatabase{3,image}),title(['s',num2str(j)]);

if rem(image,5)==0
j=j+1;
end

end

[Walter Roberson]

You assume that the directory will return at least 5 .pgm in the folder. You should be testing instead of assuming.

[shivu shetty]

How can I correct it sir

Answer 1

[Walter Roberson]

Change

personcontents=dir(['./mydata/',person_name,'/*.pgm']);

to

subdirpath = fullfile('mydata', person_name);
personcontents = dir( fullfile(subdirpath, '*.pgm') );
if length(personcontents < 5)
  error('directory "%s" does not have at least 5 pgm files');
end

You should also change

datacontents=dir('./mydata');

to

 datacontents = dir('./mydata');
 mask = ismember({datacontents.name}, {'.', '..'});
 datacontents(mask) = [];   %remove . and .. directories

and you should remove the lines

 if person<3
   continue;
 end;

That is, your code is assuming that the . and .. directories are the first two entries in what is returned by dir(), but dir() never promises that: it depends upon the file system being used. The NTFS file system for MS Windows does not promise any particular order. You appear to be using Linux; the promises made would depend on the file system. In most current file systems, '.' and '..' do not necessarily come first: instead, files or directories whose name begin with any of !"#$%&'()*+,- would come first.

[shivu shetty]

>> databanao Undefined operator '<' for input arguments of type 'struct'.

Error in databanao (line 19) if length(personcontents < 5 )

>> databanao Undefined operator '<' for input arguments of type 'struct'.

Error in databanao (line 19) if length(personcontents<5)

[Walter Roberson]

if length(personcontents) < 5