Error using subsref Index exceeds matrix dimensions [duplicate] - mysql

Question

I am trying to read series of dicom images from a folder named as series 8.below is code to read series of dicom images from a particular folder.i am getting error index exceeds matrix dimensions at info = dicominfo(fullfile(fileFolder,fileNames{1})).
clear all;
close all;
clc;
fileFolder = fullfile(pwd, 'series 8');
files = dir ( fullfile (fileFolder, '*.dcm'));
fileNames = {files.name};
%examine file header (metadata , from dicom stack)
info = dicominfo(fullfile(fileFolder,fileNames{1}))
%extract size info from metadata
voxelsize = [info.PixelSpacing;info.SliceThickness];
%read one file to get size
I = dicomread(fullfile(fileFolder,fileNames{1}))
classI = class(I);
sizeI = size(I);
numImages = length(fileNames);
%read slice images populate 3d matrix
hWaitBar = waitbar(0,'reading dicom files');
%create array
mri= zeroes(info.rows , info.columns , numImages , classI )
for i=length(fileNames):-1:1
fname = fullfile(fileFolder, fileNames{i});
mri(:,:,i) = unit16(dicomread(fname));
waitbar((length(fileNames)-i+1)/length(fileNames))
end
delete(hWaitBar);

Answer 1

Below two options that will do it. In the first you create a loop around your whole approach and as filenames is zero when there is no dcm file the loop will not get executed. The second option tests whether files is empty and if so it is not executed.
clear all;
close all;
clc;
fileFolder = fullfile(pwd, 'series 8');
files = dir ( fullfile (fileFolder, '*.dcm'));
fileNames = {files.name};
%examine file header (metadata , from dicom stack)
for i=length(fileNames):-1:1
if (i == 1)
info = dicominfo(fullfile(fileFolder,fileNames{i}));
%extract size info from metadata
voxelsize = [info.PixelSpacing;info.SliceThickness];
%read one file to get size
I = dicomread(fullfile(fileFolder,fileNames{i}));
classI = class(I);
sizeI = size(I);
numImages = length(fileNames);
%read slice images populate 3d matrix
hWaitBar = waitbar(0,'reading dicom files');
%create array
mri= zeroes(info.rows , info.columns , numImages , classI );
else
fname = fullfile(fileFolder, fileNames{i});
mri(:,:,i) = unit16(dicomread(fname));
waitbar((length(fileNames)-i+1)/length(fileNames))
end
end
delete(hWaitBar);
the second
clear all;
close all;
clc;
fileFolder = fullfile(pwd, 'series 8');
files = dir ( fullfile (fileFolder, '*.dcm'));
fileNames = {files.name};
%examine file header (metadata , from dicom stack)
if ~isempty(files)
info = dicominfo(fullfile(fileFolder,fileNames{1}))
%extract size info from metadata
voxelsize = [info.PixelSpacing;info.SliceThickness];
%read one file to get size
I = dicomread(fullfile(fileFolder,fileNames{1}))
classI = class(I);
sizeI = size(I);
numImages = length(fileNames);
%read slice images populate 3d matrix
hWaitBar = waitbar(0,'reading dicom files');
%create array
mri= zeroes(info.rows , info.columns , numImages , classI )
for i=length(fileNames):-1:1
fname = fullfile(fileFolder, fileNames{i});
mri(:,:,i) = unit16(dicomread(fname));
waitbar((length(fileNames)-i+1)/length(fileNames))
end
delete(hWaitBar);
end