Variable 'Group_Test1' not found.

clear all
clc

sad = dir('D:\Project\DB1\test\');  % Returns both folders and files 
cell_array_of_folder_names = {sad([sad.isdir]).name};  % Select folder names 
cell_array_of_folder_names( strncmp( cell_array_of_folder_names, ".", 1 ) ) = []; % Remove '.' and '..' 
sorted_cell_array_of_folder_names = sort_nat( cell_array_of_folder_names );
%----------------

[mp1, np] = size(sorted_cell_array_of_folder_names); % compute size = number of subfolders & files & . & ..
csf1=0; % counter of JUST subfolders found in PF
t=1;
for i=3:mp1
%% keep only folders:
P = strfind(sorted_cell_array_of_folder_names(i).name,'.');
if isempty(strfind(sorted_cell_array_of_folder_names(i).name,'.'))
csf1 = csf1 +1; % one sub folder found
SFN = sorted_cell_array_of_folder_names(i).name ;% extract his name
tifList = ls(sprintf('%s%s%s%s',PF,SFN,'\','*.tif')); % list all jpg files
[ms1, ns] = size(tifList); % ms = number of image files found

%% Processing for each tif file:

for j=1:ms1
tifFileName = tifList(j,:); % extract name of tif file
IM=imread([PF SFN '\' tifFileName]);
%t=1;
%for i=1:csf1
 % for j=1:ms1
         Group_Test1(t)={i-2};
        t=t+1;
end
end
PF_SFN_imgName = sprintf('%s%s%s',PF,SFN,'\',tifFileName);

end
save('Group_Test','Group_Test1');
%----------------------

[Jan]

You got a solution in your other thread already: https://www.mathworks.com/matlabcentral/answers/809300-dot-indexing-is-not-supported-for-variables-of-this-type

A 3rd thread with the same question is closed. Please stay at one question per problem. Thanks.

Answer 1

[Image Analyst]

Obviously you're either not getting into the 'if' or you're not getting into the 'for', and so the Group_Test1 never gets assigned. Here is how to solve it:

Debugging in MATLAB | Doug's MATLAB Video Tutorials

[sun rise]

Dot indexing is not supported for variables of this type.

Error in Untitled2 (line 15)
P = strfind(sorted_cell_array_of_folder_names(i).name,'.');
 
>> 

[Image Analyst]

Perhaps you need braces

sorted_cell_array_of_folder_names{i}.name

[sun rise]

Dot indexing is not supported for variables of this type.

Error in Untitled2 (line 15)

P = contains(folder_names{i}.name, '.');

>>

[Walter Roberson]

folder_names is empty.

[Image Analyst]

Why are you starting the loop at 3 when you've already removed the . and .. from cell_array_of_folder_names? It should start at 1. And there is no name field of the string in the cell. It's just a regular character array, not a structure.

sad = dir('D:\Project\DB1\test\');  % Returns both folders and files
% sad = dir(pwd);  % Returns both folders and files
cell_array_of_folder_names = {sad([sad.isdir]).name};  % Select folder names
% cell_array_of_folder_names( strncmp( cell_array_of_folder_names, ".", 1 ) ) = []; % Remove '.' and '..'
sorted_cell_array_of_folder_names = sort_nat( cell_array_of_folder_names );
% sorted_cell_array_of_folder_names = cell_array_of_folder_names; % if you don't have sort_nat
whos sorted_cell_array_of_folder_names
%----------------

[mp1, np] = size(sorted_cell_array_of_folder_names); % compute size = number of subfolders & files & . & ..
csf1=0; % counter of JUST subfolders found in PF
t=1;
for i=1:mp1
	% Skip . and ..
	if endsWith(sorted_cell_array_of_folder_names{i}, '.') || endsWith(sorted_cell_array_of_folder_names{i}, '..')
		% Skip . and ..
		continue; % Skip to bottom of loop.
	end
	% Keep only folders:
	csf1 = csf1 +1; % one sub folder found
	SFN = sorted_cell_array_of_folder_names(i).name ;% extract his name
	tifList = ls(sprintf('%s%s%s%s',PF,SFN,'\','*.tif')); % list all jpg files
	[ms1, ns] = size(tifList); % ms = number of image files found
	
	% Processing for each tif file:
	
	for j=1:ms1
		tifFileName = tifList(j,:); % extract name of tif file
		% 			IM=imread([PF SFN '\' tifFileName]);
		%t=1;
		%for i=1:csf1
		% for j=1:ms1
					Group_Test1(t)={i-2};
		t=t+1;
	end
	PF_SFN_imgName = sprintf('%s%s%s',PF,SFN,'\',tifFileName);
	
end
% save('Group_Test','Group_Test1');
%----------------------

[sun rise]

. and .. not removed

Answer 2

[Image Analyst]

Before the loop

Group_Test1 = zeros(1, mp1);

In the loop:

Group_Test1(t) = i - 2;

After the loop

Group_Test1 = Group_Test1(1:t-1); % Crop off any unused elements