Zero entries in one column of a matrix

[Henry F. Mollet]

I have a matrix M with say 100 rows and 2 columns. The second columns
contains say 25 zeros.

M ( M(:,2) ~=0 , 1 ) produces 1st col without the entries when there's a
zero in the second column;
M ( M(:,2)~=0 , 2 ) produces 2nd col without the entries when there's a zero
in the second column;

I understand that M(:,2) ~=0 produces a col vector of length 100 with 1's,
whenever the statement (~=0) is true, i.e. not a zero
and produces a zero entry, whenever the statement (~=0) is false, i.e. a
zero.

But how does the elimination of the zero entries (in the second column of M)
work in
M (statement, 1) producing col vector of length 100-25=75, and
M (same statement, 2) producing col vector of length 75 also?
Henry 



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