Dimension of matrices being concatenanted is not consistent.. PLease hellp !!!

I want the end result to be a1 a2 a3... a10 .... aa1..a10 ..01...010

My code is :

letters=['a'; 'b'; 'c'; 'd'; 'e'; 'f'; 'g'; 'h'; 'i'; 'j'; 'k'; 'l'; 'm'; 'n'; 'o' ;'p'; 'q'; 'r'; 's'; 't' ; 'u' ;'v' ;'w'; 'x' ;'y'; 'z'; 'aa'; 'bb'; 'cc'; 'dd'; 'ee'; 'ff'; 'gg'; 'hh'; 'ii'; 'jj'; 'kk'; 'll'; 'mm'; 'nn'; 'oo'; 'pp'; 'qq'; 'rr'; 'ss'; 'tt'; 'uu'; 'vv'; 'ww'; 'xx'; 'yy'; 'zz'; '0'; '1'; '2'; '3'; '4'; '5'; '6'; '7'; '8'; '9'];

increment =1;

for y = 1 :1: 62

for k = 1 : 1 : 10

test = strcat(letters(y,:) , num2str(k));

Answer 1

[Star Strider]

I would use a cell array, that you can create by changing the square brackets [] by curly braces {}:

letters={'a'; 'b'; 'c'; 'd'; 'e'; 'f'; 'g'; 'h'; 'i'; 'j'; 'k'; 'l'; 'm'; 'n'; 'o' ;'p'; 'q'; 'r'; 's'; 't' ; 'u' ;'v' ;'w'; 'x' ;'y'; 'z'; 'aa'; 'bb'; 'cc'; 'dd'; 'ee'; 'ff'; 'gg'; 'hh'; 'ii'; 'jj'; 'kk'; 'll'; 'mm'; 'nn'; 'oo'; 'pp'; 'qq'; 'rr'; 'ss'; 'tt'; 'uu'; 'vv'; 'ww'; 'xx'; 'yy'; 'zz'; '0'; '1'; '2'; '3'; '4'; '5'; '6'; '7'; '8'; '9'};

See the documentation on Access Data in Cell Array (link) for details on how to work with it.

[Fareeha Yaseen]

It worked , thank you

[Star Strider]

My pleasure.

[Fareeha Yaseen]

 letters={'a'; 'b'; 'c'; 'd'; 'e'; 'f'; 'g'; 'h'; 'i'; 'j'; 'k'; 'l'; 'm'; 'n'; 'o' ;'p'; 'q'; 'r'; 's'; 't' ; 'u' ;'v' ;'w';  'x' ;'y'; 'z'; 'aa'; 'bb'; 'cc'; 'dd'; 'ee'; 'ff'; 'gg'; 'hh'; 'ii'; 'jj'; 'kk'; 'll'; 'mm'; 'nn'; 'oo'; 'pp'; 'qq'; 'rr'; 'ss'; 'tt'; 'uu'; 'vv'; 'ww'; 'xx'; 'yy'; 'zz'; 'num0'; 'num1'; 'num2'; 'num3'; 'num4'; 'num5'; 'num6'; 'num7'; 'num8'; 'num9'};

 increment =1;

 for y = 1: 62

    for k = 1 : 10

        test = strcat(letters(y,:) , num2str(k));

        imageName = imread('training_set',test,'.png');
        imageName = rgb2gray(imageName);
        x(:, increment) = (feature_extract(~im2bw(imageName)));
        increment = increment + 1;

    end;

 end;

x = x';

This is my complete code , the concatenation part is working but theres a new error which says :

Error using imread (line 347) Cannot open file "training_set" for reading. You might not have read permission.

Error in myFeatureScript (line 6) imageName = imread('training_set',test,'.png');

Please Help !!

[Star Strider]

Please post your last Comment as a new Question. Then delete the Comment here.

[Fareeha Yaseen]

https://www.mathworks.com/matlabcentral/answers/370783-cannot-open-file-no-permission

Its posted here