: Colon. Used in subscripts, FOR iterations and possibly elsewhere.
J :K is the same as [J , J +1, ..., K]
J :K is empty if J > K.
J :D:K is the same as [J , J +D, ..., J +m*D] where m = fix((K-J)/D).
J :D:K is empty if D > 0 and J > K or if D < 0 and J < K.
The colon notation can be used to pick out selected rows,
columns and elements of vectors and matrices.
A(:) is all the elements of A, regarded as a single
column. On the left side of an assignment statement, A(:)
fills A, preserving its shape from before.
A(:,J ) is the J-th column of A
A(J :K) is A(J ),A(J +1),...,A(K)
A(:,J :K) is A(:,J ),A(:,J +1),...,A(:,K) and so on.
For the use of the colon in the FOR statement, See FOR .
Copyright (c) 1984-93 by The MathWorks, Inc.