Cody

Problem 87. Indexed Probability Table

Created by Cody Team in Cody Challenge

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]

Solution Stats

67.19% Correct | 32.81% Incorrect
Last solution submitted on Oct 12, 2018

Problem Comments

Solution Comments

Recent Solvers872

Tags

Discover MakerZone

MATLAB and Simulink resources for Arduino, LEGO, and Raspberry Pi

Learn more

Discover what MATLAB® can do for your career.

Opportunities for recent engineering grads.

Apply Today

MATLAB Academy

New to MATLAB?

Learn MATLAB today!