Error undefined function while it is already defined

Hi

I got undefined function while using the following function:

function nearest_neighbor_zoom(file,fac)
    im=imread(file);
    [h,v]=size(im);
    for i=1:h
        for j=1:v
        im1( floor(1+(i-1)*fac), floor(1+(j-1)*fac),:)=im(i,j); %mapping pixels of given image to a new array so that zooming factor is satisfied. 
        end  
    end
    [h1,v1]=size(im1);
    disp('Unknown pixel values are being interpolated. Look at Figure1');
%nearest neighbor interpolation
    for i=1:h1-1 
        for j=1:v1-1  

                 if(  (floor( 1+(    ceil((i-1)/fac+1)    -1)*fac )==i)  && ( floor( 1+(    ceil((j-1)/fac+1)    -1)*fac )==j )  ) % maped values from the original picture should not be recalculated.     
                 else  %for pixels that should be calculated    

                 if(floor( 1+(    ceil((i-1)/fac+1)    -1)*fac )==i) %on a defined vertical level
                     xo00=ceil((i-1)/fac+1);
                     x00=i;
                 else
                     xo00=floor((i-1)/fac+1); 
                     x00=floor(1+(xo00-1)*fac);
                 end

                 if( floor( 1+(    ceil((j-1)/fac+1)    -1)*fac )==j )%on a defined horizontal level
                     yo00=ceil((j-1)/fac+1);
                     y00=j;
                 else
                     yo00=floor((j-1)/fac+1);
                     y00=floor(1+(yo00-1)*fac);
                 end                  

                xo10=xo00+1;
                yo10=yo00;
                x10=floor(1+(xo10-1)*fac); %current coordinate of 10;
                y10=floor(1+(yo10-1)*fac);

                xo01=xo00;
                yo01=yo00+1;
                x01=floor(1+(xo01-1)*fac); %current coordinate of 01;
                y01=floor(1+(yo01-1)*fac);

                xo11=xo10;
                yo11=yo01;
                x11=x10; %current coordinate of 11;
                y11=y01;          

                xlen=x11-x00;
                ylen=y11-y00;

                x=i-x00;
                y=j-y00;

                dx=x/xlen; %converting coordinates of the pixel being calculated to (0*1)(0*1) domain.
                dy=y/ylen;          

                 if dx<=0.5 %if the pixel being calculated is near to the known upper pixel level. 
                     nx=0; 
                 else  %to known lower pixel level.
                     nx=1;
                 end

                 if dy<=0.5 %if the pixel being calculated is near to the known left pixel level.
                 ny=0;
                 else  %to known right pixel level.
                 ny=1; 
                 end  

                 if ((nx==0) &&(ny==0)) %assigning the upper left known pixel to the pixel being calculated.
                     h00=im1(x00,y00,:);
                     im1(i,j,:)=h00;
                 elseif ((nx==1) && (ny==0)) %assigning the lower left known pixel to the pixel being calculated.
                     h10=im1(x10,y10,:);
                     im1(i,j,:)=h10;
                 elseif((nx==0) && (ny==1)) %assigning the upper right known pixel to the pixel being calculated.
                      h01=im1( x01,y01,:);
                     im1(i,j,:)=h01;
                 elseif((nx==1)&&(ny==1)) %assigning the lower right known pixel to the pixel being calculated.
                     h11=im1(x11,y11,:);
                     im1(i,j,:)=h11;
                 end
             end
          end
        imshow(im1); %displaying image being interpolated.
      end
      disp('Zooming is complet. Look at Figure1');
      imshow(im1);
      imwrite(im1,'zoomed_pic.jpg');
  end

The error is:

Undefined function or variable 'nearest_neighbor_zoom'.

May you please help me how to fix the problem?

Thank you

[Stephen23]

Where have you saved nearest_neighbor_zoom ? Is that folder on the MATLAB Search Path?:

https://www.mathworks.com/help/matlab/matlab_env/what-is-the-matlab-search-path.html

Have you saved the Mfile with the same name as the function?

Answer 1

[madhan ravi]

Replace nearest_neighbor_zoom with nearest_neighbor_zoom1 and see if the error persists , if it does

there is already a function with the same name if so please rename or delete (if necessary).

see common errors when calling a function

Answer 2

[Wajahat Muhammad]

Have you saved the file as the function name.File name should be same as function name.