Squish

Squish removes ALL singleton dimensions.

Description

Squish(x) will remove all singleton dimensions in x, including conversion of row vectors to column vectors.

Since singleton dimensions can confuse many operations, this function removes absolutely ALL singleton dimensions. SQUEEZE though similar, does not operate on 2D arrays which include row vectors. Thus the expected result may not always occur with SQUEEZE.

Note: This same operation can be performed with shiftdim(squeeze(x)), but squish has been timed to be faster.

For example compare the results of the following for any positive or negative n:
size(squeeze(shiftdim([1:3]',n)))
size(squish(shiftdim([1:3]',n)))

• MATLAB release: MATLAB 7.9 (2009b)
• Other requirements: Should work on all platforms and all versions that support "reshape".

[Jan Simon]

The actual computation is short (slightly simplified and accelerated version):
  dims = size(x);
  y = reshape(x, [dims(dims~=1),1,1]);
H1-line existing, complete help, name of the author and date mentioned and even a comment in the 3 lines of source. The author really spent time to make his function useful and usable for the FEX members.