Problem 722. Make a run-length companion vector
Given a vector x, return a vector r that indicates the run length of any value in x. Each element in r shows how many times the corresponding element in x has appeared consecutively.
Example:
Input x = [5 3 3 1 0 9 9 4 4 4 4 5 1 2 2] Output r = [1 1 2 1 1 1 2 1 2 3 4 1 1 1 2]
Solution Stats
Problem Comments
-
6 Comments
False exemple description
y=[];
for i = 1:length(delta)
test = max(delta(1:i));
maxsofar=max(delta(1:i-1));
test2=min(delta(1:i));
minsofar=min(delta(1:i-1));
if test == delta(i) && delta(i)~= maxsofar
y=[y,1];
elseif test2 == delta(i) && delta(i)~= minsofar
y=[y,-1];
else
y=[y,0];
end
end
this code despite its giving correct results it is rejected by the tests...
There are reasonable situations that are not addressed by the problem definition or tested for.
IE if there was a case such as x = [5 3 3 1 3 3 3] is the expected answer
r = [1 1 2 1 1 2 3] or
r = [1 1 2 1 2 2 3]?
Solution Comments
Show commentsProblem Recent Solvers644
Suggested Problems
-
8970 Solvers
-
Remove any row in which a NaN appears
8649 Solvers
-
Omit columns averages from a matrix
595 Solvers
-
Back to basics 3 - Temp Directory
372 Solvers
-
Getting the row and column location from a matrix
288 Solvers
More from this Author50
Problem Tags
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!