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2011-11-14 06:59:50 +0100 asked a question evaluating an expression

Hello,

started to use open source mathematical software. And i have some questions since i can not find in google what i am searching for (maybe i am a bad searcher :S).

The thing is if i write in maple (with predefined F, M, q and Q):

Sum('F[ix]', 'i' = 1 .. n) = 0; '-2*F*cos(45*deg)-3*Q+4*RB*cos(45*deg)-RB*sin(45*deg)-M = 0'; evalf[4](solve(%, RB))

I get

RB := 19.51

And in Sage:

solve(-2*F*cos(45*deg)-3*Q+4*RB*cos(45*deg)-RB*sin(45*deg)-M,RB)

i get:

[23/3*sqrt(2) + 26/3 == 23/3*sqrt(2) + 26/3]

Now i do not find any equivalent to evalf in sage. Could someone help me, please?