How to graph cdf?

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Estela
Estela 2022-12-15
回答： William Rose 2022-12-15
Here's the rpoblem: The default random number generators for most programming languages provides a uniform distribution on the interval [0,1]. What is the probability that a MATLAB random number generator yields (a) X=0.25
>> F = cdf('Uniform',0.25,0,1)
how could I graph this with x n of trials and probability?
  1 个评论
Fifteen12
Fifteen12 2022-12-15
This looks like homework, but even if it's not, you might want to read the following. It will help when trying to get help with questions like this! https://www.mathworks.com/matlabcentral/answers/8626-how-do-i-get-help-on-homework-questions-on-matlab-answers
Otherwise, the question doesn't quite make sense. If you graphed "the probability that" rng generates "X=0.25" then your graph would just be a dot. Maybe rephrase the question, and add what you've already tried?

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回答（1 个）

William Rose
William Rose 2022-12-15
Ran in:
@Estela,
I agree with the comments of @John Morris. The probability that a random number generator for a continuous distribution (such as the uniform distribution) produces one pre-specified value is zero. That is because one point is an infinitesimally small part of a line segment. Example:
X=rand(1e6,1); %a million randoms on U[0,1)
disp(length(X(X==.25))) %display the number of X=.25's found
0
None found in a million tries.
Maybe that is the point of the question. As @John Morris notes, there's nothing interesting to plot.

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