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function to change the extension to an image using matlab

I am trying to make a function that read an image and change its extension, I want it recognize its original name and change just the extension so I get the name and later concatenate but i can't understand why is not working. I appreciate any help.

function salida = cambioFormatoImagen(x)
  y = imread(x);
  [pathstr,name,ext] = fileparts(x);
  nombre=name;
  concatena=strcat(nombre,'.jpg')
  imwrite(y,concatena);
  imshow(y);
end



>> cambioFormatoImagen
Error using cambioFormatoImagen (line 2)
Not enough input arguments.
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My mistake was to not use any input argument to the function. I should have used something similar to:

salida = cambioFormatoImagen('image.png')

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