I have an index vector that I have to change and I want to change the values of them
20 views (last 30 days)
Show older comments
Hi all!
I have a vector:
v = [1 0 0 1 1]
I got another index vector that says me which of these values have to be changed to 1:
index = [1 5 3]
The result should be:
v = [1 0 1 0 1]
The code to do this with a for is this one:
for i=1:Nc_needed
v(index(i)) = 1;
end
I know that there are ways to do it in only one line. Anyone knows how?
0 Comments
Accepted Answer
Wayne King
on 18 Feb 2013
Edited: Wayne King
on 18 Feb 2013
v = [1 0 0 1 1];
idx = [1 5 3];
v(idx) = 1;
But that does not give exactly what you said originally because orignally, elements 1,4,and 5 were already ones, so all the above does is set element 3 to a 1.
Another way
v = zeros(1,5);
v(idx) = 1;
So the way to do it with one line is create a vector of indices that you want to change -- the indices must be greater than or equal to 1 and less than or equal to the length of the vector, then use that vector to assign the value to "data" vector
More Answers (0)
See Also
Categories
Find more on Matrix Indexing in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!