Revision history [back]

Thank you for your answers.

Of course there are several ways to fix it, but my point is that I don't understand why it works with sqrt(3) and don't with sqrt(2). It seems a problem in accuracy. And it leads to a maybe not good algorithm for painting.

I think this kind of simple examples can transmit a poor image of Sage to pupils. Moreover, if you simply google "plot sqrt(2-x^2)" you obtain a more precise graph. And if you use an obsolete software like Mathematica 4.2 you obtain an ugly graph, but precise at extreme points. And maybe in older versions the result is the same, but i can't check it.

My point of view in this question is not to find alternatives to do a simple task when a command is not working properly in comparison to other softwares. Since it is an easy question there are several alternatives, but believe me, not all pupils are able to find them. My purpose is to ask if someone knows why the command is behaving like this and more interesting, if is there any plan to change it.

Sorry for my answer, but my wish is improve Sage.