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[WP34s] Regularized incomplete Beta function
05-01-2014, 07:17 PM (This post was last modified: 05-01-2014 07:18 PM by Dieter.)
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[WP34s] Regularized incomplete Beta function
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
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[WP34s] Regularized incomplete Beta function - Dieter - 05-01-2014 07:17 PM



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