Comparision of two strings

How to compare all the characters of the following two strings. I tried with strcmp, but it doesn't take the numbers for comparision. I have to differentiate n3 and n4 in the following lines

PATH=strcat('F:\OASIS\database\OAS1_',num2str(i,'%04d'),'_MR1\PROCESSED\MPRAGE\T88_111\OAS1_',num2str(i,'%04d'),'_MR1_mpr_n4_anon_111_t88_masked_gfc','.hdr');
N4=strcat('F:\OASIS\database\OAS1_',num2str(i,'%04d'),'_MR1\PROCESSED\MPRAGE\T88_111\OAS1_',num2str(i,'%04d'),'_MR1_mpr_n3_anon_111_t88_masked_gfc','.hdr');

Any help? Thanks in Advance

Answer 1

[the cyclist]

I don't understand what you are trying to do. Did you define a value for i before you ran this code? I ran

i = 3;

PATH=strcat('F:\OASIS\database\OAS1_',num2str(i,'%04d'),'_MR1\PROCESSED\MPRAGE\T88_111\OAS1_',num2str(i,'%04d'),'_MR1_mpr_n4_anon_111_t88_masked_gfc','.hdr');
N4=strcat('F:\OASIS\database\OAS1_',num2str(i,'%04d'),'_MR1\PROCESSED\MPRAGE\T88_111\OAS1_',num2str(i,'%04d'),'_MR1_mpr_n3_anon_111_t88_masked_gfc','.hdr');

strcmp(PATH,N4)

which ran to completion with no error.

[Jes]

yes . This is my code

 for i=1:457
PATH=strcat('F:\OASIS\database\OAS1_',num2str(i,'%04d'),'_MR1\PROCESSED\MPRAGE\T88_111\OAS1_',num2str(i,'%04d'),'_MR1_mpr_n4_anon_111_t88_masked_gfc','.hdr');
N4=strcat('F:\OASIS\database\OAS1_',num2str(i,'%04d'),'_MR1\PROCESSED\MPRAGE\T88_111\OAS1_',num2str(i,'%04d'),'_MR1_mpr_n3_anon_111_t88_masked_gfc','.hdr');
if strcmp(PATH~=N4)
    V=hdr_read_volume(PATH);
end
 end

[Jes]

Thanks for your advise. I am getting warning message. May I know the reason please?

 Warning: Control
Character '\O' is not
valid.

Answer 2

[Image Analyst]

Try this

differentIndexes = find(PATH ~= N4);

By the way, have you ever thought about using sprintf() for a much simpler way to build strings?

[Jes]

Here is my detailed question, I have 457 folders named OAS1_0001_MR1,OAS1_0002_MR1 etc. Each folder contains a file named OAS1_0001_MR1_mpr_n4_anon_111_t88_masked_gfc. In some folders OAS1_0001_MR1_mpr_n4_anon_111_t88_masked_gfc is replaced as OAS1_0001_MR1_mpr_n3_anon_111_t88_masked_gfc. I want to reject this n3 file and have to read n4 files. How do I solve this issue. I tried the following :

 for i=1:457
PATH=strcat('F:\OASIS\database\OAS1_',num2str(i,'%04d'),'_MR1\PROCESSED\MPRAGE\T88_111\OAS1_',num2str(i,'%04d'),'_MR1_mpr_n4_anon_111_t88_masked_gfc','.hdr');
N4=strcat('F:\OASIS\database\OAS1_',num2str(i,'%04d'),'_MR1\PROCESSED\MPRAGE\T88_111\OAS1_',num2str(i,'%04d'),'_MR1_mpr_n3_anon_111_t88_masked_gfc','.hdr');
if strcmp(PATH~=N4)
    V=hdr_read_volume(PATH);
end
 end

Any help? Thanks in Advance

[Image Analyst]

Try this:

% baseFileName is constant for all folders:
baseFileName = 'OAS1_0001_MR1_mpr_n4_anon_111_t88_masked_gfc.hdr';
for k = 1 : 457
  thisFolder = sprintf('F:/OASIS/database/OAS1_%04d_MR1/PROCESSED/MPRAGE/T88_111', k);
  fullFileName = fullfile(thisFolder, baseFileName);
  if exist(fullFileName, 'file')
    % Found the n4 file, so read it in:
    V(k) = hdr_read_volume(fullFileName);
  end
end

[Jes]

Thanks for your help. Here my baseFileName is not constant for all folders.It varies like OAS1_0001_MR1_mpr_n4_anon_111_t88_masked_gfc.hdr, OAS1_0002_MR1_mpr_n4_anon_111_t88_masked_gfc.hdr,etc for 457 folders

[Image Analyst]

Then just create the filename and search for n4 within it.

if ~isempty(fullFileName, '_n4_')
  % Found the n4 file, so read it in:
  V(k) = hdr_read_volume(fullFileName);
end