geoinv - Geometric inverse cumulative distribution function
Syntax
X = geoinv(Y,P)
Description
X = geoinv(Y,P) returns
the smallest positive integer X such that the geometric
cdf evaluated at X is equal to or exceeds Y.
You can think of Y as the probability of observing X successes
in a row in independent trials where P is the probability
of success in each trial.
Y and P can be vectors,
matrices, or multidimensional arrays that all have the same size.
A scalar input for P or Y is
expanded to a constant array with the same dimensions as the other
input. The values in P and Y must
lie on the interval [0 1].
Examples
The probability of correctly guessing the result of 10 coin
tosses in a row is less than 0.001 (unless the coin is not fair).
psychic = geoinv(0.999,0.5)
psychic =
9
The example below shows the inverse method for generating random
numbers from the geometric distribution.
rndgeo = geoinv(rand(2,5),0.5)
rndgeo =
0 1 3 1 0
0 1 0 2 0
See Also
icdf, geocdf, geopdf, geostat, geornd
Geometric Distribution
 | geocdf | | geomean |  |
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