LOGICALEXPAND

Y = LOGICALEXPAND(X,N) returns a logical vector Y of the same length as the vector X.
For N > 0, series of true entries in X are expanded with N values on either side. For N < 0, series of true entries in X are shrinked with N values on either side. For N = 0, Y equals logical(X).

Examples:
% expand by 1
logicalexpand(logical([0 0 0 1 0 0 0 1 1 0 0 0 1]), 1)
% -> [0 0 1 1 1 0 1 1 1 1 0 1 1]

% shrink with 2
logicalexpand(logical([0 1 1 1 1 1 1 0 0 0 1 1 1 1 1]).', -2)
% -> [0 0 0 1 1 0 0 0 0 0 0 0 1 0 0].'

See also find, logicalfind (File Exchange)