MATLAB: Errors in using RESHAPE FUNCTION……PLEASE HELP ME.

Question

HI,

 WHAT I HAVE DONE IS.
1.RED ONE IMAGE STOREDF AS IMAZE NAME=A;
2.RESIZE IT INTO 128*128 MANNER
3.I WANT THESE PIXEL ELEMTS IN SINGLE COLUMN
           SO   I  CODED AS   B=RESHAPE(A,C,D) WHERE C =128*128 AND D= 1
 ERROR IS 
              z=reshape(a,c,d);
??? Error using ==> reshape
To RESHAPE the number of elements must not change.

PLEASE CORRECT ME?

BELOW IS CODE WHAT I HAVE DONE. a=imread('C:\Documents and Settings\All Users\Documents\My Pictures\Sample Pictures\Water lilies.jpg');

b=imresize(a,[128 128])

b=imresize(a,[128 128]);

c=128*128;

d=1;

z=reshape(a,c,d);

Answer 1

b = imresize(a,[128 128]);
z = b(:);