stats_cdf_f
Hello, I needed badly this function, but there was no documentation available about it, so I dug deep into the code and found out something very interesting:
stats_cdf_gamma(float par1, float par2, float par3, int which)
The value of parameter “which” determines
the meaning of the remaining 3 other parameters (par1,par2,par3)
and the outcome of the calculation, as illustrated below:
WHICH --> Integer indicating which of the next four argument values is to be calculated from the others.
Legal range: 1..4
which = 1 : Calculate P and Q from X,SHAPE and SCALE
which = 2 : Calculate X from P,Q,SHAPE and SCALE
which = 3 : Calculate SHAPE from P,Q,X and SCALE
which = 4 : Calculate SCALE from P,Q,X and SHAPE
Where the meaning of P,Q,SCALE,SHAPE is given below:
P <--> The integral from 0 to X of the gamma density.
Input range: [0,1].
Q <--> 1-P.
Input range: (0, 1].
P + Q = 1.0.
X <--> The upper limit of integration of the gamma density.
Input range: [0, +infinity).
Search range: [0,1E100]
SHAPE <--> The shape parameter of the gamma density.
Input range: (0, +infinity).
Search range: [1E-100,1E100]
SCALE <--> The scale parameter of the gamma density.
Input range: (0, +infinity).
Search range: (1E-100,1E100]
In summary:
| which |par1 |par2 |par3 |the function returns: |
| 1 |X |SHAPE |SCALE | P |
| 2 |P |SHAPE |SCALE | X |
| 3 |P |X |SCALE | SHAPE |
| 4 |P |X |SHAPE | SCALE |
I tried it for which=1 and it works fine.
stats_cdf_gamma
(PECL stats >= 1.0.0)
stats_cdf_gamma — Calculates any one parameter of the gamma distribution given values for the others.
Açıklama
float stats_cdf_gamma
( float
$par1
, float $par2
, float $par3
, int $which
)Uyarı
Bu işlev hala belgelendirilmemiştir; sadece değiştirge listesi mevcuttur.
Değiştirgeler
-
par1 -
-
par2 -
-
par3 -
-
which -
Dönen Değerler
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User Contributed Notes
stats_cdf_gamma
dgcowboy70 at gmail dot com
30-May-2012 04:17