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20171208 05:58:01 +0200  marked best answer  numerical approximations of complex_embedding How can I get a numerical approximation of an expression like 3^(1/2)/2 which is not 0.866025403784439? 
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20150327 04:12:33 +0200  marked best answer  cannot run: from sage.rings.number_field.splitting_field import SplittingData When I type this line in Sage, I get the following error message: I see in the online documentation that splitting fields of polynomials over number fields is very recent in Sage: 
20150327 04:12:33 +0200  marked best answer  how to plot poset and subposet in a graph? hot to put poset and subposet and order_filter and order_ideal in one graph,but different color? PP = Posets(6)[18];show(PP,vertex_size=100,vertex_colors='yellow'); Q = PP.subposet([2,4]);Q;show(Q,vertex_size=100,vertex_colors='green') PP.order_filter([3,2]);PP.order_ideal([4,3]) 
20150327 04:12:32 +0200  marked best answer  why sagenb.mc.edu cannot register? sage.lacim.uqam.ca cannot register too ,why? and sage.lacim.uqam.ca not in wiki.sagemath.org servers lists,why? 
20150327 04:12:28 +0200  marked best answer  is notebook(interface='', secure=False) a loophole? I try command:notebook(),it is some information about SAGENB servers...... I have no more secrity knowledge about computer,It maybe change admin passwords? 
20150327 04:12:25 +0200  marked best answer  question about hilbert_class_polynomial I run sagecell hilbert_class_polynomial sqrt(5),but different with below: 
20150327 04:10:25 +0200  marked best answer  AttributeError: 'NumberFieldFractionalIdeal' object has no attribute 'ray_class_number'
I tried an example from doc/reference: 
20150327 04:10:01 +0200  marked best answer  when I unloading a *.sws,how cannot find it out ? I download SM_sphere_S2.sws,and uploading it (project/new/to Upload files from your computer),but where is it? no save button..... link text 
20150327 04:09:58 +0200  marked best answer  what matrix.plot meanings? when I run bolow,a graph appears,how to understand it?

20150327 04:09:58 +0200  marked best answer  some links cannot back Sage Reference Manual 1 https://sage.epsevg.upc.edu:8000/doc/... when link below,no button to back to Sage Reference Manual REFERENCES: [WpJacobianVariety] http://en.wikipedia.org/wiki/Jacobian... 2 https://sage.epsevg.upc.edu:8000/doc/... when link below,no button to back to Sage Reference Manual,it link to http://trac.sagemath.org/13100,but blank page... there are more links like above troubles at other places in Sage Reference Manual,I meet several times 
20150327 04:09:57 +0200  marked best answer  where is all others published in cloud sage? where is all others published in cloud sage? I try cloud.sage can plot and published myself, it very well but where others published? the cloud projects use like labyrinth, it is too complex....... 
20150327 04:09:57 +0200  marked best answer  how to transfer *.svg to *.gif or jepg? how to transfer *.svg to *.gif or jepg? 
20150327 04:09:57 +0200  marked best answer  how to define var vector? cannot run 
20150327 04:09:56 +0200  marked best answer  how to use the function ord()? ord? there no example. and other function like lambda?, no in index of Sage Reference Manual 
20150327 04:09:56 +0200  marked best answer  why lim((x^2x+1)^(1/2)+x,x=oo,dir='below') is red error x=oo, negative infinity,the answei is appear,but red error,1/2 is right? 
20150327 04:09:56 +0200  marked best answer  what meanings about global_height of AffineSpace'point P.<x,y>=AffineSpace(QQ,2) Q=P(41,1/12) Q.global_height() 
20150327 04:09:19 +0200  marked best answer  can sagecloud open many windows like sagenb? sagenb has many windiws when need,how to do in sagecloud? 