Scratch

I take it this happened when you tried to 'turn (sqrt (###) ) degrees', of something along those lines. Also, are you sure you didn't make a typo? It is true that you cannot take the square root of a negative number (x < 0), but what you said, x > 0, should work. To avoid this problem, extending it to (abs(sqrt(x) ) ) will do the trick. A slightly more thorough, although sometimes mathematically incorrect way would be
<if><(<{ x }><<>0)>
<set{ y }to(( 0 <-> <abs( sqrt(x) )) )) ))
<else>
<set{ y }to <abs( sqrt(x)) ))
<end>
[/blocks]
If you provided more information, I could help you further.

Last edited by billyedward (2009-10-11 02:00:23)

billyedward wrote:

Another thing:
You are using scratch 1.0 with error catching turned off, right?
If you use a more up-to-date version, then the script will simply turn red, no bothersome walkback error.

I have Scratch 1.4. There is no error catching

I don't know what this means:

Float(Object)>>error: 
Float>>sqrt
Point>>r 
Point>>rotateBy:about: 
[] in WarpBit class>>rotate:degress:center:scaleBy:smoothing:  
Array(SequenceableCollection)>>collect:
WarpBit class>>rotate:degress:center:scaleBy:smoothing: 
ScratchSpriteMorph>>generateRotatedForm
ScratchSpriteMorph>>layoutChanged 
ScratchSpriteMorph(ScriptableScratchMorph)>>costumeChanged

But you might be using the sqrt block wrong. Also, look at this line:

ScratchSpriteMorph>>generateRotadedForm

That might have something to do with
[blocks]<turn cw(  )degrees>[/blocks]and[blocks]<turn cw(  )degrees>[/blocks]but I could be wrong.
Also, the line

ScratchSpriteMorph(ScriptableScratchMorph)>>costumeChanged

might have something to do with
[blocks]<switch to costume[ [/blocks]or[blocks]<next costume>[/blocks]