Computing an Expectation in Matlab
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I'm trying to compute the sum of x*binopdf(x,18,.96) for values of x from 0 to 16. How can I do that? It keeps giving me errors.
回答（1 个）
Roger Stafford
2017-2-25
The code
x = 0:16;
E = sum(x.*binopdf(x,18,.96));
should give you the answer.
3 个评论
Shane Kosir
2017-2-25
Roger Stafford
2017-2-25
编辑：Roger Stafford
2017-2-25
Is there some reason why your x ranges only over 0:16 and yet your N value in binopdf is equal to 18? As it stands, it will not give you the true expected value.
Also please tell me in what respect it "didn't work".
Walter Roberson
2017-2-25
When I use the above code, the value I get is _exactly the same as I get when I compute the precise value 36848322448959471846167088 / 14551915228366851806640625 through a different software package.
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2017-2-25
2017-2-25
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