errors in using RESHAPE FUNCTION......PLEASE HELP ME.

Error using reshape

To RESHAPE the number of elements must not change.

Error in load_database (line 10)

all_Images(:,(i-1)*5+j)=reshape(image_Container,size(image_Container,1)*size(image_Container,2),1);

Answer 1

[Sulaymon Eshkabilov]

Note that while using reshape(), size of an array to be reshaped must be compatible with its being reshape. E.g.:

A = randi([0, 5], 5, 4);
B1 = reshape(A, 3, 3)      % Does not work because of the size mismatch
B2 = reshape(A, 3, 4)      % Does not work because of the size mismatch
B3 = reshape(A, 2, 10)     % Works perfectly well!

Thus, check the size of your array in the position of [A] vs. sizes to be reshaped before proceeding reshape operation.

Answer 2

[Steven Lord]

More likely than not your image_Container variable has 3 or more dimensions.

x = randi(10, [2 3 4]);
sz = size(x)

sz = 1×3

2 3 4

sz1 = size(x, 1)

sz1 = 2

sz2 = size(x, 2)

sz2 = 3

y = reshape(x, sz1*sz2, 1)

Error using reshape
Number of elements must not change. Use [] as one of the size inputs to automatically calculate the appropriate size for that dimension.

You can't stuff 24 elements (since x is 2-by-3-by-4) into a 6-by-1 vector.

If you want to reshape the array into a column vector, two ways to do this are to use the colon index or to use reshape and use either [] (to make reshape calculate the size in that dimension) or numel.

y1 = x(:);
y2 = reshape(x, [], 1);
y3 = reshape(x, numel(x), 1);
whos x y1 y2 y3