random variable with normal distribution

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saif yahya
saif yahya 2020-12-22
评论： Image Analyst 2020-12-23
how can i find the first five moments of a random variable with pdf gaussisn distribution , and finding the characteristic function all in matlab?

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Image Analyst
Image Analyst 2020-12-22
编辑：Image Analyst 2020-12-22
To get a bunch of random numbers drawn from a normal distribution, use randn().
r = randn(...........
If you want the nth moment just take the nth root of the sum of the values and divide by the number of samples minus 1.
If you want the central moments, then subtract the mean before raising to a power.
Sounds like homework (so I didn't give the actual MATLAB code, which is actually pretty simple - just a single line of code). Is it homework?
How do I get help on homework questions on MATLAB Answers? - MATLAB Answers - MATLAB Central
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saif yahya
saif yahya 2020-12-23
if the above random variable r you defined by randn is truncated to have a region support r=[40,150] how to define the new pdf
Image Analyst
Image Analyst 2020-12-23
histogram() will give you the actual, empirical pdf. Not some theoretical analytical function. So the values don't matter. Support doesn't matter. You get what the PDF actually IS.

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