unidinv - Discrete uniform inverse cumulative distribution function
Syntax
X = unidinv(P,N)
Description
X = unidinv(P,N) returns
the smallest positive integer X such that the discrete
uniform cdf evaluated at X is equal to or exceeds P.
You can think of P as the probability of drawing
a number as large as X out of a hat with the numbers 1 through N inside.
P and N can be vectors,
matrices, or multidimensional arrays that have the same size, which
is also the size of X. A scalar
input for N or P is expanded
to a constant array with the same dimensions as the other input. The
values in P must lie on the interval [0 1]
and the values in N must be positive integers.
Examples
x = unidinv(0.7,20)
x =
14
y = unidinv(0.7 + eps,20)
y =
15A small change in the first parameter produces a large jump
in output. The cdf and its inverse are both step functions. The example
shows what happens at a step.
See Also
icdf, unidcdf, unidpdf, unidstat, unidrnd
Uniform Distribution (Discrete)
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