[WP34s] Regularized incomplete Beta function

[Dieter]

I just tried the regularized incomplete Beta function \(I\beta\) on the 34s. Looking at appendix I of the PDF manual and the given mathematical definition, the argument x and the two parameters a and b of \(I_x(a, b)\) would have to be entered this way:

Z: b
Y: a
X: x

However, this does not work - it throws errors and/or returns wrong results. After some experimenting it turned out that the actual parameter sequence apparently looks like this:

Z: x
Y: b
X: a

Example:
Evaluating \(I_{0.1}(3, 5) = 0.0256915\) requires the sequence 0.1 [ENTER] 5 [ENTER] 3.

Which leads to the question whether the manual or the implementation is wrong. Or... is it me ?-) I am using v3.2 3405. Did this get changed in the meantime?

BTW, a stack diagram would be helpful with multi-argument functions like this.

Dieter