Search All of the Math Forum:
Views expressed in these public forums are not endorsed by
Drexel University or The Math Forum.


dpb
Posts:
9,220
Registered:
6/7/07


Re: Creating Booleans from Vectors
Posted:
Sep 17, 2013 7:46 PM


On 9/17/2013 6:25 PM, Roger Stafford wrote: > "Michael " <mabowles@syr.edu> wrote in message > <l1aehk$d3o$1@newscl01ah.mathworks.com>... >> x = [1 3 8 10 11]; >> y = [2 6 9 15]; xy_ordered = [1 2 3 6 8 9 10 11 15]; >> >> cX = [1 0 1 0 1 0 1 1 0] >> cY = [0 1 0 1 0 1 0 0 1]; %by definition the is ~cX.. >           > cX = ismember(xy_ordered,x); > cY = ismember(xy_ordered,y); > > The vectors cX and cY are logical vectors which contain true's and > false's. To transform them to 1's and 0's, apply "double" to them. Note > that if a number lies in both x and y, there will be a 1 (true) in both > cX and cY in the same position. It is not necessary that x, y, or > xy_ordered be ordered for this code to operate.
Good catch  I was trying to figure out the indices labeled just XY from x and y instead of the combined...
And, of course,
cY = ~cX;
or vice versa, if use ismember on the other first...




