i tryng to run a .m file but always shows a error undefined variable.... plz help

errror : Undefined variable "cropping" or class "cropping.m".

The cropping.m file is : %===============================================================================

function[out,check] =cropping_fun(image, x_TopLeft, y_TopLeft, x_BottomRight, y_BottomRight)

check=0;

clc; close all;

% let us handle cases if the user inputs incorrect or insufficient inputs

if nargin>0 if (ischar(image))&&(exist(image, 'file')==2)

        A=double(imread(image));

    elseif exist('image', 'var')

        A=double(image);
    end
    size_A=size(A);
end

if nargin==0 A=double(imread('D:\\Thesis Code\\Source Code\\StegoImage.png'));

    size_A=size(A);

    x_TopLeft=ceil(size_A(1)/4);

    y_TopLeft=ceil(size_A(2)/4);

    x_BottomRight=floor(3*size_A(1)/4);

    y_BottomRight=floor(3*size_A(2)/4);
elseif nargin==1
    x_TopLeft=ceil(size_A(1)/4);
    y_TopLeft=ceil(size_A(2)/4);
    x_BottomRight=floor(3*size_A(1)/4);
    y_BottomRight=floor(3*size_A(2)/4);
elseif nargin==2
    y_TopLeft=ceil(size_A(2)/4);
    x_BottomRight=floor(3*size_A(1)/4);
    y_BottomRight=floor(3*size_A(2)/4);
elseif nargin==3
    x_BottomRight=floor(3*size_A(1)/4);
    y_BottomRight=floor(3*size_A(2)/4);
elseif nargin==4
    y_BottomRight=floor(3*size_A(2)/4);
end

%==========================================================================

% size of the cropped image

M=x_BottomRight-x_TopLeft+1; N=y_BottomRight-y_TopLeft+1;

%==========================================================================

% Memory allocation for the output image for faster implementation of the % code

image_dim=size(size_A);

if image_dim(2)==3 P=3; B=zeros(M, N, P); else B=zeros(M, N); end

%==========================================================================

if ((M>0)&&(N>0))

    for i=1:M
        for j=1:N
            B(i, j, :)=A(x_TopLeft+i, y_TopLeft+j, :);
        end
    end

    new_imagesc(A);
    title('Original image');

    new_imagesc(B);
    title('Cropped image');
else
    error('Check the dimensions of the cropped image.');
end

end % End of the cropping_fun

%==========================================================================

function new_imagesc(A)

%==========================================================================

% Author: Prashant Athavale % Date 11/19/2011 % Please acknowledge my name if you use this code, thank you. % This is a function to display images at the center of the screen using % Matlab's imagesc function

%==========================================================================

figure; screen_size=get(0,'screensize'); screen_width=screen_size(3); screen_height=screen_size(4); figure_width=screen_size(4)/2; % width of the figure figure_height=screen_size(4)/2; % height of the figure x_lowerbottom=(screen_width-figure_width)/2; y_lowerbottom=(screen_height-figure_height)/2; set(gcf,'position',[x_lowerbottom y_lowerbottom figure_width figure_height]); image_dim=size(size(A));

% What to do if the image is color/RGB or grayscale

if image_dim(2)==3 M=max(max(max(A))); elseif image_dim(2)==2 M=max(max(A)); end

if M>1

    M=1;
else
    M=255;
end

% imagesc likes the images from 0 to 255 % if they are not then we make them so.

A=double(A); imagesc(uint8(A*M)); if image_dim(2)==3 colormap('colormap'); else colormap('gray'); end

end % end of function new_imagesc

%==========================================================================

Answer 1

[Image Analyst]

Read this so you'll know how to format your code. Then rename your m-file so that it has the same name as your function, cropping_fun.m. See if that helps.