Earlier post sent prematurely by acciident, sorry!

On Thursday, July 26, 2012 3:47:34 PM UTC+1, Anthony Wickstead wrote:
>
> I don't think I am doing anything stupid, but I am fairly new to Sage. 
>
> I am using Sage 5.0 (Ubuntu 12.04 64 bit, running under Virtualbox) but 
> the same behaviour occurs with Sage 4.7 running under Debian (not sure of 
> version). I am trying to plot the graph of h(a,x) fo a range of values of a.
>
> def h(a,x):
>     if x<=a:
>          return 2-sqrt(1-(1-x/a)^4)
>      else:
>          return sqrt(1-((x-a)/(2-a))^6)
> plot(sqrt(x),(x,0,1))                            #Works fine
> [h(.5,x) for x in [0..2,step=.1]]            #Returns plausible looking 
> list
> plot(h(.5,x),(x,0,2))                            #shows a horizontal 
> straight line graph (approximately zero) 
>
plot(sqrt(x),(x,0,1)                                #another straight line, 
approximately sqrt(2)

Is this a weird bug or am I doing something wrong?

Tony Wickstead
 

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