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

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

[Anand]

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

z = b(:);

[Anand]

In your code,

z = reshape(b,c,d);

[ajay kumar]

thanks but z=b(:) meaning?

what i have to do if i want some n=3 colums and n=some rows..

z=reshape(b,c,d) not working gives same result

[Anand]

b has 128*128=16384 elements. You cannot reshape it so that it has 3 columns because 16384/3 is fractional. What is your end goal?