how to merge the matrices in one matrice?

I want to merge class matrix in one matrix in for loop but it gives error like Unrecognized function or variable 'allclass'.

for d =1:3 ;
     
            class(:,1:3) = [num(num(:,3)==d,1:3)];
           
           
            allclass= [allclass ; class];
     
     
        
 end

[David Hill]

An example with your data would be helpful. Look at reshape() function.

Answer 1

[Chidvi Modala]

"Unrecognized function or variable 'allclass'" error may occur because allclass variable is not initialized before using it. So, you can initialize "allclass" variable with an empty array. You can make use of the following example

num = [3 2 1;2 2 2; 1 2 3];
allclass = [];
for d =1:3 ;  
            temp = num(num(:,3)==d,1:3);
            allclass= [allclass ; temp];   
end