Problem 87. Indexed Probability Table

This question was inspired by a Stack Overflow question forwarded to me by Matt Simoneau.
Given a vector x, make an indexed probability vector p that shows the likelihood of each unique element of x occurring. You can assume that x will always be composed of integers greater than 0.
For example, if x is [4 4 4 4] then the number 4 is 100% likely to occur and no other number has any likelihood of occurring. By convention, p has as many elements as the highest number in x. This makes the indexing straightforward. So in this case, p = [0 0 0 1]. That is, p(4) = 1, which is to say that 4 occurs with 100% probability, as noted above. Note that p has no dependence on the order of the elements in x.
If
x = [1 2 1 2 1 2 1 2 1 2]
then
p = [0.5 0.5].
And if
x = [5 5 2 8]
then
p = [0 0.25 0 0 0.5 0 0 0.25]
Solve

Solution Stats

73.0% Correct | 27.0% Incorrect
Last Solution submitted on Nov 20, 2024

Problem Comments

Solution Comments

Show comments

Problem Recent Solvers2451

Suggested Problems

More from this Author96

Problem Tags

matlab

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!