作业帮matlab中如何就反函数
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matlab中如何就反函数
matlab中如何就反函数
matlab中如何就反函数
finv
F inverse cumulative distribution function
Syntax
X = finv(P,V1,V2)
Description
X = finv(P,V1,V2) computes the inverse of the F cdf with numerator degrees of freedom V1 and denominator degrees of freedom V2 for the corresponding probabilities in P. P, V1, and V2 can be vectors, matrices, or multidimensional arrays that all have the same size. A scalar input is expanded to a constant array with the same dimensions as the other inputs.
The parameters in V1 and V2 must all be positive integers, and the values in P must lie on the interval [0 1].
The F inverse function is defined in terms of the F cdf as
where
Examples
Find a value that should exceed 95% of the samples from an F distribution with 5 degrees of freedom in the numerator and 10 degrees of freedom in the denominator.
x = finv(0.95,5,10)
x =
3.3258
You would observe values greater than 3.3258 only 5% of the time by chance.