Imagine a dice tetra-brick (four faces: 1, 2, 3, 4) with the following probabilities [0.5, 0.2, 0.2, 0.1] . Let Y be the Random Variable that simulate the output of rolling the dice.

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Marina Suá 2020-11-30

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评论： Walter Roberson 2020-11-30

I'm trying to make an histogram from this function but I don't know how to count the number of outcomes, meaning how many 1's I got, the number of 2's and so on.

My code looks like this: disp(["The value that came out is:",num2str(randsample((1:4),100,true,[0.5,0.2,0.2,0.1]))])

And it returns a 1,2,3 or 4, in a 100 examples, so I want to count the number of ones like I said.

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Answer 1

Steven Lord 2020-11-30

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Use histcounts or histogram.

Alternately if this is part of a homework assignment and you're instructed not to use those functions, a for loop where you add 1 to elements of a vector would work too.

You should assign the output of randsample to a variable so you can reuse it both in your display code as well as the counting code.

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Marina Suá 2020-11-30

But I need to count the number of ones I get, the number of twos I get and so on... I don't know if I'm explaining my self. I don't know if there is a function frorm matlab or not.