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Jos
Posts:
1,268
Registered:
10/24/08


Re: Vector comparison using if
Posted:
Nov 20, 2012 4:04 AM


"Rajasekhara Madhusudan Narayana Bhatla" <rmnaraya@asu.edu> wrote in message <k8eno8$k9d$1@newscl01ah.mathworks.com>... > Hi, > I'm sought of new using matlab. I've a situation where I've to assign a variable 2 different values based on how the values in vector > > it is something like. > fs=1000; > x=1:4/fs:5; > if x<2 > Y=x.^2 > else > Y=4; > end. > > i.e, my Y will also be a vector whose value depends on where I x is. if x is <2 then y is x^2 if not it is a constant. > > I'm not sure how to do this. > i tried it with if any(x)<2 but I then i realized that it is not correct. since I want for all values of x<2 Y=x^2 and all values of x >2 x = 4. > > Please Help, > > Thanks, > Sekhar.
Learn about logical indexing, one of the great strengths of matlab. Here is an example:
x = 1:10 tf = x < 5 % a logical vector y = zeros(size(x)) % preallocation y(tf) = 1 y(~tf) = 10
~ Jos



