Le mercredi 1 octobre 2014 22:06:50 UTC+2, NahsiN a écrit :
>
> Hello, I don't know where to post this so redirect me as needed. I believe
> I have found a typo in the sage tutorial. Under Sage Tutorial v6.3 >> A
> Guided Tour >> Some Common Issues with Functions we have the lines
> def h(x):
> if x<2:
> return 0
> else:
> return x-2
>
> The issue: plot(h(x), 0, 4) plots the line y=x−2, not the multi-line
> function defined by h. The reason? In the command plot(h(x),0, 4), first
> h(x) is evaluated: this means plugging x into the function h, *which
> means that **x<2** is evaluated*.
>
> I think the else clause is evaluated and not the if x<2 clause.
> Thanks,
> Nishan
>
You can work around this as follows:
plot(lambda x: h(x), 0, 4)
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