Hi, On 2014-05-29, SiL588 . <ch4r...@hotmail.com> wrote: > Unfortunately I don't know the rules of Phyton language,
Sage's main language for programming is Python, and also the language for user interaction is close to Python. We believe it is a big plus of Sage that it uses a mainstream language! I don't think it is needed to have in-depth knowledge of Python for using Sage. However, in *any* computer algebra system, one has to learn the basics of whatever language the system is using; in most other systems it is a language that is less nice than Python... > I think I did what you said, I assinged m a value that was the result of=20 > multiplication between real numbers. I was reading the worksheet that you have attached. In the first cell, you define a lot of symbolic variables (a,b,c,d,e,f,R,Rt). In the second cell, you override most of them (a=10, b=3, ...). Hence, at least for those variables that you override in the second cell, the first cell is of no use. > So, if a real number have no simplify methods, how can I simplify it? I don't know what you mean by "simplify a real number". Anyway, try what happens if you comment out m1.simplify() (i.e., simply put the character "#" in front of it; that's Python syntax again). The cell that is currently giving you the error then becomes m1=a*b*c*rho1 m2=-b*e*f*rho1 m3=(pi*R^2*b)/2*rho1 m4=-pi*Rt^2*b*rho1 m5=pi*Rt^2*3*b*rho2 #m1=m1.simplify() show(m1) show(m2) show(m3) show(m4) show(m5) As you will see, m1=12.0, m2=-1.8: How do you expect this to be simplified? On the other hand, m3 is not a real number, but a symbolic expression, as it contains the symbolic constant pi: m3=0.6*pi Here, you could ask for simplification, for example (0.6*pi).simplify() However, the result will of course still be the same symbolic expression, as 0.6*pi can not be further simplified. If you want to express 0.6*pi as a real number, you can do this: RR(0.6*pi) which returns 1.88495559215388. Explanation: RR denotes the field of real numbers (with some digital precision). RR(...) converts the given input into an element of RR, if possible. Best regards, Simon -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
