How to convert char data to num??

I have .mat file which contains labels of my image dataset. These labels are numbers (0,1,2,3,4,5,6) but in mat file these are saved as characters ('0','1','2','3','4','5','6'). How to convert these chars to num??

   % Features Extraction of Face based on HOG
  clear;
  testing=imageSet('Testing\','recursive'); %  folder name of the database 

K=1;

for i=1:size(testing,2 )
    for j=1:testing(i).Count
        Face=read(testing(i),j);
       Face=imresize(Face, [48 48]);
        HOG_Features=extractHOGFeatures(Face);
         testingFeatures(K,:)=single(HOG_Features); 
        testinglabel{K}=testing(i).Description;
        K=K+1;
    end
    persons{i}=testing(i).Description;
end
testinglabel=testinglabel';
csvwrite(' Testing.csv', testingFeatures)

Answer 1

[Adam Danz]

In your example, "characters ('0','1','2','3','4','5','6')" it looks like the labels might be a cell array of strings. For example

c = {'1','2','3','4'};

If that's the case, you can use

d = str2double(c);

Here's the conversion if the labels are a single string of numbers.

% single string of numbers
c = '1 2 3 4 5'; 
d = str2double(strsplit(c));