besseli: Am I missing something?

[Robert T. Short]

Before I file a bug report, maybe I should check that I am not all wet.

If I recall my Bessel function theory,

besseli(n,x) = besseli(-n,x)

if n is an integer.

In octave 3.4.2 I get

octave:3> besseli(1,1),besseli(-1,1)
ans =  0.565159103992485
ans =  0.565159103992485

Looks good for n=1, but for n=10

octave:4> besseli(10,1),besseli(-10,1)
ans =  2.75294803983687e-10
ans = -1.40610343427994e-07

Not so good!

And for n=100

octave:5> besseli(100,1),besseli(-100,1)
ans =  8.47367400813812e-189
ans =  7.38028373423800e+170

BTW, the numbers for positive n agree to about 9 or 10 decimal places 
with my tables.  Also, BTW, the relationships for besselj seem to work fine.

Anybody?

Bob