How can I change the Horizontal Resolution and Vertical Resolution of image?

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Shantanu Jana on 19 Mar 2015

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https://ch.mathworks.com/matlabcentral/answers/184009-how-can-i-change-the-horizontal-resolution-and-vertical-resolution-of-image

Commented: Walter Roberson on 22 Jul 2015

filename='b.bmp';
info = imfinfo(filename);
info
if (info.HorzResolution>0&&info.VertResolution>0)
   xres = info.HorzResolution;
   yres = info.VertResolution;
   f=7874/xres;
   B= iir(filename,50);
   filename=sprintf('b.bmp');
   imwrite(B,filename);
else
    display('No DPI');
end

I have written this code to change the Horizontal Resolution and Vertical Resolution of image but after creating new image by this code when I am calling the new image by the code It say No DPI