Problem 45882. Matrix indexing with two vectors of indices (★★)
(copy of Prob 589)
Given a matrix M and two index vectors a and b, return a row vector x where x(i) = M(a(i),b(i)). Thus, if
a = [ 1 2 5 ]
b = [ 4 5 2 ]
M = [ 17 24 1 8 15;
23 5 7 14 16;
4 6 13 20 22;
10 12 19 21 3;
11 18 25 2 9 ]
then
x = [ M(1,4) M(2,5) M(5,2) ]
x = [ 8 16 18 ]
Avoid using for/while loops.
Solution Stats
Solution Comments
Show commentsProblem Recent Solvers39
Suggested Problems
-
Remove any row in which a NaN appears
8549 Solvers
-
Find remainder when x is divided by 3
158 Solvers
-
97 Solvers
-
782 Solvers
-
Calculate Amount of Cake Frosting
23663 Solvers
More from this Author52
Problem Tags
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!