isa strangeness

[Richard E. Harke]

I installed octave last night and have been reading the manual
trying things. (Debian lenny system, installed from debian archive)
I tried:
10> class(10)
ans = double

Seems good. Then I tried:
11> isa(10, double)

Invalid call to double.  ......

which seems like a bug

Even more curious:
12> isa(10, double(10))
ans = 0

which seems to say that 10 does not belong to the class it belongs to.

13> isa(10, class(10))
ans = 1
is correct but hardly seems useful.

This is not an auspicious start.

Richard