Comments (7)
The function is defined for a real numbers, but this algorithm only works for integer multiples of .5.
Implementing regularized incomplete beta for the rest will require a continuous fraction. I'll do it today.
from math-php.
This is also in the pending pull request.
from math-php.
Thanks for updating the function.
I added many unit tests and it looks good for most calculations. However, I found a case where the calculations don't match the online calculator I was using to create the unit test data.
When $a is a half integer (#.5) and $b is an integer, the result doesn't seem to match the online calculators.
For example:
$x = 0.55, $a = 2.5, $b = 2
This online calculator gives this result: 0.47672251 (http://www.analyticscalculators.com/calculator.aspx?id=37)
However, our function gives this result: 0.35452425122782244
Can you check this case?
Thanks.
from math-php.
Will do. I was using the Mathworld Site for checking values.
from math-php.
Those recursive functions in the top 'exact' part of the method are likely extensions of the translation functions in the bottom. I bet if I pull out my algebra skill, I can double check the for loop to make sure it's correct.
from math-php.
I added a pull request to fix this.
from math-php.
Merged pull request and added new unit tests. All tests pass.
from math-php.
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