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[sagesupport] Re: Keeping coefficients as floats when using solve kcrisman Mon Feb 20 11:01:07 2012
On Feb 20, 10:39 am, Michael Orlitzky <[EMAIL PROTECTED]> wrote: > On 02/19/12 19:58, Mike wrote: > > > When I run: > > > x,y=var('x,y', domain=RR) > > solve(2.0*x+3.0*y==4.0, y) > > > I get > > > [y == 2/3*x + 4/3] > > > but I would like to get > > > [y == 0.666666666666666*x + 1.3333333333333] > > > How can I do this? > > Wild guess: the float coefficients are coerced to QQ, because otherwise > numerical inaccuracy would prevent us from finding a solution. For example, No, this is just Maxima. We try to "keep float" as much as possible, but in their *sub*routines like solve, sometimes this distinction is not preserved for technical reasons  probably analogous to the one that you allude to about QQ. (%i2) keepfloat:True; (%o2) True (%i3) solve(2.0*x+3.0*y=4.0,y); rat: replaced 4.0 by 4/1 = 4.0 rat: replaced 2.0 by 2/1 = 2.0 rat: replaced 3.0 by 3/1 = 3.0 2 x  4 (%o3) [y =  ] 3  To post to this group, send email to [EMAIL PROTECTED] To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sagesupport URL: http://www.sagemath.org
 [sagesupport] Keeping coefficients as floats when using solve Mike 2012/02/19
 Re: [sagesupport] Keeping coefficients as floats when using solve Michael Orlitzky 2012/02/20
 Re: [sagesupport] Keeping coefficients as floats when using solve Michael Orlitzky 2012/02/20
 Re: [sagesupport] Keeping coefficients as floats when using solve Burcin Erocal 2012/02/20
 Re: [sagesupport] Keeping coefficients as floats when using solve Michael Orlitzky 2012/02/20
 Re: [sagesupport] Keeping coefficients as floats when using solve Michael Orlitzky 2012/02/23
 [sagesupport] Re: Keeping coefficients as floats when using solve kcrisman 2012/02/20 <=