Dot indexing is not supported for variables of this type.

Question

sun rise 2021-4-21

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/809300-dot-indexing-is-not-supported-for-variables-of-this-type

回答： Image Analyst 2021-4-22

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=1: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');
%----------------------

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,'.');

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Answer 1

Jan 2021-4-21

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/809300-dot-indexing-is-not-supported-for-variables-of-this-type#answer_681295

编辑：Jan 2021-4-21

在 MATLAB Online 中打开

Replace:

strfind(sorted_cell_array_of_folder_names(i).name,'.');
% by
strfind(sorted_cell_array_of_folder_names{i},'.');

The name of the variable is cruel: "sorted_cell_array_of_folder_names". But it implies, that the variable is a cell array. So getting the field "name" is not working.

Your code can be simplified:

Omit the brute "clear all". It removes all loaded functions from the memory. The reloading from the slow disk wastes time without any benefit.
"folder_names" is a nice name, while "cell_array_of_folder_names" impedes reading the code.
contains and startsWith are useful. Compare:

cell_array_of_folder_names( strncmp( cell_array_of_folder_names, ".", 1 ) ) = [];

with

folder_names(startsWith(folder_names, ".")) = [];

and

P = strfind(sorted_cell_array_of_folder_names(i).name,'.');
if isempty(strfind(sorted_cell_array_of_folder_names(i).name,'.'))

with

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

This is cruel:

tifList = ls(sprintf('%s%s%s%s',PF,SFN,'\','*.tif')); % list all jpg files
[ms1, ns] = size(tifList);

Creating a char output only to count the lines is very indirect. Nicer:

tifList = dir(fullfile(PF, SFN, '*.tif'));
ms1     = numel(tifList);

fullfile cares for the proper file separators.

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sun rise 2021-4-21

在 MATLAB Online 中打开

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(startsWith(folder_names, ".")) = []; % Remove '.' and '..' 
folder_names = sort_nat( cell_array_of_folder_names );
%----------------
[mp1, np] = size(folder_names); % compute size = number of subfolders & files & . & ..
csf1=0; % counter of JUST subfolders found in PF
t=1;
for i=1:mp1
%% keep only folders:
P = contains(folder_names{i}, '.');
if ~P
csf1 = csf1 +1; % one sub folder found
SFN = folder_names{i} ;% extract his name
tifList = dir(fullfile( SFN, '*.tif')); % list all jpg files
ms1     = numel(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([ 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');
%----------------------