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## what is ALPHA?

**From**: |
Niitsu Yoichiro |

**Subject**: |
what is ALPHA? |

**Date**: |
Fri, 06 Oct 2000 15:13:28 +0900 |

I'm new to Octave. I have a question that cannot be solved by reading
the info-manual or the FAQ list. I would be grateful if someone direct
me.
In info, besselj() is described as:
Special Functions
=================
- Mapping Function: besseli (ALPHA, X)
- Mapping Function: besselj (ALPHA, X)
- Mapping Function: besselk (ALPHA, X)
- Mapping Function: bessely (ALPHA, X)
Compute Bessel functions of the following types:
`besselj'
Bessel functions of the first kind.
`bessely'
Bessel functions of the second kind.
`besseli'
Modified Bessel functions of the first kind.
`besselk'
Modified Bessel functions of the second kind.
The second argument, X, must be a real matrix, vector, or scalar.
The first argument, ALPHA, must be greater than or equal to zero.
If ALPHA is a range, it must have an increment equal to one.
If ALPHA is a scalar, the result is the same size as X.
If ALPHA is a range, X must be a vector or scalar, and the result
is a matrix with `length(X)' rows and `length(ALPHA)' columns.
-----------------------------------------------------------------------
However, what is ALPHA? The order of the bessel function? If so,
ALPAH must be integer, or not? (Fractional order is available?)
Thanks in advance,
Yoichiro Niitsu
Yokohama, Japan
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**what is ALPHA?**,
*Niitsu Yoichiro* **<=**