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20150326 22:12:33 0500  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: 
20150326 22:12:33 0500  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]) 
20150326 22:12:32 0500  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? 
20150326 22:12:28 0500  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? 
20150326 22:12:25 0500  marked best answer  question about hilbert_class_polynomial I run sagecell hilbert_class_polynomial sqrt(5),but different with below: 
20150326 22:10:25 0500  marked best answer  AttributeError: 'NumberFieldFractionalIdeal' object has no attribute 'ray_class_number'
I tried an example from doc/reference: 
20150326 22:10:01 0500  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 
20150326 22:09:58 0500  marked best answer  what matrix.plot meanings? when I run bolow,a graph appears,how to understand it?

20150326 22:09:58 0500  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 
20150326 22:09:57 0500  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....... 
20150326 22:09:57 0500  marked best answer  how to transfer *.svg to *.gif or jepg? how to transfer *.svg to *.gif or jepg? 
20150326 22:09:57 0500  marked best answer  how to define var vector? cannot run 
20150326 22:09:56 0500  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 
20150326 22:09:56 0500  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? 
20150326 22:09:56 0500  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() 
20150326 22:09:19 0500  marked best answer  can sagecloud open many windows like sagenb? sagenb has many windiws when need,how to do in sagecloud? 
20150326 22:09:11 0500  marked best answer  sagecell version is 6.0? sagecell version is 6.0? 
20150326 22:09:10 0500  marked best answer  what meanings about "xmrange_iter([[0, 1], [0, 1]], <function <lambda> at 0xb94ab1c>)" 
20150326 22:09:01 0500  marked best answer  what is katsura ideal in Documentation http://sagemath.org/doc/reference/rin... I search katsura here,but no define about katsura ideal. 
20150326 22:08:55 0500  marked best answer  how to get a ideal of Power Series Ring When I run the above in sagecell, nothing appears. How to get the ideal is_commutative or prime or max_ideal or principal? 
20150326 22:08:50 0500  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? 
20150326 22:08:50 0500  marked best answer  the same function appears twice in the documentation The functions base_field()/constant_base_field()/constant_field()/vector_space()/maximal_order()/random_element appear twice in the following document: http://sagemath.org/doc/reference/fun... and what different with RationalFunctionField() and FunctionField()? 
20150326 22:08:50 0500  marked best answer  how to get the general formula of SHATATE GROUP? how to get SHA general formula by parametrization a1, a2, a3, a4, a6,no a number 
20150326 22:08:49 0500  marked best answer  when home/pub can recover? http://wiki.sagemath.org/reu/2011/sch... http://nt.sagenb.org/home/pub/72/ http://nt.sagenb.org/home/pub/79/ http://nt.sagenb.org/home/pub/139/ and there are many code about home/pub at http://sagemath.org/librarypublicati.... if sagenb willnot support from 5.12 to 6.12,old home/pub will add to sagecloud in the future? 
20150326 22:08:49 0500  marked best answer  how to get two modules tensor_prduct() above are two vectors'tensor_product,but when use two mudules,cannot run.... 
20150326 22:08:48 0500  marked best answer  can sagecell show more than one line codes results? below three lines codes can get three results in sagenb,but in sagecell only can show the third line codes result..... 
20150326 22:08:48 0500  marked best answer  ValueError: too many values to unpack I want try prime ideal factorzation in extension field,how to run [i.L.is_galois() for i, _ in SUB] 
20150326 22:08:42 0500  marked best answer  <repr(<sage.modular.modform.element.Newform at 0x7f0c8fa15c30>) failed: IndexError: list index out of range>], 1 why \QQ7 is red?maybe 7adic field Op7? 2 free_module is error. <repr(<sage.modular.modform.element.newform at="" 0x7f0c8fa15c30="">) failed: IndexError: list index out of range>], 
20150326 22:08:40 0500  marked best answer  when sagecell run show(),the result only above top show(q[3].simplify_full()) is the last command,but the result appear the toppest 