compute expectation of a variable

[Samuel Cheng]

Hi,

Lea is a great pedagogic tool and I am trying to use it for my class on information theory and probability. I may have missed that but I couldn’t find it from the tutorial. How can we find the expectation of a random variable?

for example, say for

X = lea.pmf({1:0.5, 2:0.5})

do we have something like

X.expectation

to get 1*0.5 + 2*0.5?

Thanks!

Sam

[Pierre Denis]

Hi Sam,

Very pleased to hear that Lea may be used for your class!

Lea is using the wording "mean" for what you're looking for. This is briefly mentioned here, in the first page of the tutorial. So, you simply have to type:

X.mean

which shall return here 1.5.

[Samuel Cheng]

Thanks for the quick reply! I was silly missing that! Thanks again!