Hi Mark,
the code from Number>>raisedTo:

    aNumber isInteger ifTrue: [
        "Do the special case of integer power"
        ^ self raisedToInteger: aNumber].
    aNumber isFraction ifTrue: [
        "Special case for fraction power"
^ (self nthRoot: aNumber denominator) raisedToInteger: aNumber numerator ].
    self < 0 ifTrue: [
^ ArithmeticError signal: 'Negative numbers can''t be raised to float powers.' ].
    0 = aNumber ifTrue: [^ self class one].    "Special case of exponent=0"
    1 = aNumber ifTrue: [^ self].    "Special case of exponent=1"
    0 = self ifTrue: [                "Special case of self = 0"
        aNumber < 0
            ifTrue: [^ (ZeroDivide dividend: self) signal]
            ifFalse: [^ self]].
    ^ (aNumber * self ln) exp        "Otherwise use logarithms"

Werner

p.s. Hi Ben, <g> yes, i wrote that email a bit too fast, the video from http://www.screencast.com/t/LCEl0hFl

On 06/07/2017 07:03 PM, Mark Rizun wrote:
Hi Werner,

I believe that I am the one to answer this question, but I need more information.
Please, could you send the code that you have in upper left panel.

Cheers,
Mark

2017-06-07 18:46 GMT+02:00 Ben Coman <b...@openinworld.com <mailto:b...@openinworld.com>>:

    I don't know much about RewriteToolbuilder, so probably won't be
    the one to give a proper answer,
    but to help someone else answer... could you narrow down which
    video with a link?

    cheers -ben

    On Thu, Jun 8, 2017 at 12:05 AM, werner kassens
    <wkass...@libello.com <mailto:wkass...@libello.com>> wrote:

        Hi,
        i followed the video and opened the RewriteToolbuilder on some
        code in pharo4.0. i then tried to keep things simple and made
        a transformationrule,which i thought would not change
        anything, by just copying "‘@.Statements." into the lower left
        & right panels (without the " of course).i then press
        'generate rule' and get a 'Syntax Error: end of Statement list
        encountered' with this specification: ^ ArithmeticError
        signal: 'Negative numbers canEnd of statement list encountered
        -> ''t be raised to float powers.' . but this part of the code
        in the upper left panel is just a copy of some unchanged
        standard pharo4.0 code. where did i go wrong?
        werner





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