MATLAB: It is showing error

Question

% Alphabets
A=imread('alpha/A.bmp');
B=imread('alpha/B.bmp');
C=imread('alpha/C.bmp');
D=imread('alpha/D.bmp');
E=imread('alpha/E.bmp');
F=imread('alpha/F.bmp');
G=imread('alpha/G.bmp');
H=imread('alpha/H.bmp');
I=imread('alpha/I.bmp');
J=imread('alpha/J.bmp');
K=imread('alpha/K.bmp');
L=imread('alpha/L.bmp');
M=imread('alpha/M.bmp');
N=imread('alpha/N.bmp');
O=imread('alpha/O.bmp');
P=imread('alpha/P.bmp');
Q=imread('alpha/Q.bmp');
R=imread('alpha/R.bmp');
S=imread('alpha/S.bmp');
T=imread('alpha/T.bmp');
U=imread('alpha/U.bmp');
V=imread('alpha/V.bmp');
W=imread('alpha/W.bmp');
X=imread('alpha/X.bmp');
Y=imread('alpha/Y.bmp');
Z=imread('alpha/Z.bmp');
% Numbers
one=imread('alpha/1.bmp');
two=imread('alpha/2.bmp');
three=imread('alpha/3.bmp');
four=imread('alpha/4.bmp');
five=imread('alpha/5.bmp'); 
six=imread('alpha/6.bmp');
seven=imread('alpha/7.bmp');
eight=imread('alpha/8.bmp');
nine=imread('alpha/9.bmp'); 
zero=imread('alpha/0.bmp');
% Array of Alphabets
alphabets = [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];
% Array of Numbers
numbers = [one two three four five six seven eight nine zero];
% Creating new template
NewTemplates = [alphabets numbers];
save('NewTemplates','NewTemplates')

Answer 1

Hi Kartikey,

The function imread assumes the argument to be be a valid path (relative/absolute) pointing to a valid image file. In your code, you have provided a relative path to alpha folder. Hence, make sure that a folder named alpha (containing the bmp files) exists on the path containing the code (the above .m file).

More on imread. Refer:- https://www.mathworks.com/help/matlab/ref/imread.html

To get a list of valid image formats. Refer:- https://www.mathworks.com/help/matlab/ref/imformats.html

Also make sure that in the line:-

% Creating new template
NewTemplates = [alphabets numbers];

The arrays alphabets and numbers should be compatible for horizontal concatenation.

More on horzcat:- https://www.mathworks.com/help/matlab/ref/horzcat.html