What's wrong with my code? (poisson distribution)

I tried to get a bar graph of poisson pdf without poisspdf function. For example, x=0:20; p=3.^x / factorial(x) * exp(-3); bar(x,p)
but it shows wrong graph. What is the problem?

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2015 年 11 月 9 日

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2015 年 11 月 9 日

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