I have a .dcm file containing multiple frames. I use:

for i=1 : frameNum
   f = dicomread(path2dcm, 'frames', i);
  % downsample f
end

to downsample each frame. But how do I write all the downsampled frames to a 
single .dcm file? I have looked at: dicomwrite but it does not seem to 
support this operation, any ideas?