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2017-02-11 17:48:28 +0200 | commented question | Adding zero to an expression and avoiding simplification Yes as they should. But when expressions are of the form $E_x = |

2017-02-10 23:34:49 +0200 | asked a question | Adding zero to an expression and avoiding simplification Hi, I have an expression of the form
Now the last two terms add 0 to the expression. The goal is to substitute complicated expressions for Ey, Ex (complex quantities) and compare the results of two different reformulations (with and without the 0 terms). So for my work, I need the last two terms to be there but sagemath is simplifying this expression automatically. How do I avoid this? |

2017-02-10 23:26:30 +0200 | commented question | Typeset very slow in notebook Sure, yes you are correct. I have large formulas that were having trouble rendering on sagemath cloud. On my own machine, the browser was slow at rendering mathjax but it was affecting my performance in other cells _after_ stuff had been rendered. |

2017-02-09 04:42:46 +0200 | asked a question | Factoring out complex exponentials Hi, If I have an expression as follows $\frac{3}{8} {{E}_y^-}^{2} \overline{{E_y^+}} e^{\left(i \omega t + 3 i k x\right)} + \frac{3}{8} \, {{E}_y^-}^{2} \overline{{{E}_y^-}} e^{\left(i \omega t + i k x\right)} + \frac{3}{4} \, {{E}_y^-} {E_y^+} \overline{{E_y^+}} e^{\left(i \, \omega t + i \, k x\right)} + \frac{3}{4} \, {{E}_y^-} {E_y^+} \overline{{{E}_y^-}} e^{\left(i \omega t - i k x\right)} + \frac{3}{8} \, {E_y^+}^{2} \overline{{E_y^+}} e^{\left(i \, \omega t - i \, k x\right)} + \frac{3}{8} \, {E_y^+}^{2} \overline{{{E}_y^-}} e^{\left(i \omega t - 3 i k x\right)}$ How do I factor out a complex exponential $e^{i\omega t - ikx}$ from the expression above using a command? |

2017-02-09 04:26:49 +0200 | asked a question | Typeset very slow in notebook Hi, running sagemath v7.2 using the AIMs PPA. Is there a reason typesetting output in notebook is so slow? |

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2017-02-09 00:07:29 +0200 | commented answer | Converting expression to list of terms and back How does this work for converting [b |

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2015-07-17 00:00:28 +0200 | commented question | setwd() function in R does not work in Sage No they were in separate cells. Putting the two commands in one cell works. Thanks for the clarification. Now it makes sense. |

2015-07-13 18:34:27 +0200 | commented question | simplify_full() Maxima ECL error The same issue arises in sage 6.7. It seemed to have been fixed in 6.6 but it's back in 6.7. |

2015-06-28 01:02:11 +0200 | asked a question | setwd() function in R does not work in Sage Hello, I am trying to use setwd() for R in the sage notebook to set the current working directory. But it does not seem to work. I get the following So as shown, the setwd() command has no effect. Any suggestions? |

2015-06-27 23:52:41 +0200 | asked a question | help() in R mode produces underscores in output Hello, I am using the sage notebook to interface with R. I am using the R interpreter for the whole sheet. Whenever I use help such as help(sort), the output has underscored. For e.g. sort package:base R Documentation _S_o_r_t_i_n_g _o_r _O_r_d_e_r_i_n_g _V_e_c_t_o_r_s _D_e_s_c_r_i_p_t_i_o_n: So basically whereever there should be a space there is an underscore. Does anyone else have this issue? I am using sage 6.7 on ubuntu using the ppa. |

2015-06-27 23:35:14 +0200 | commented answer | How to use R with Sage? Thank you for that plotting command. I couldn't get plot(x,y) to work but saving to png on Ubuntu works. Cheers |

2015-05-12 22:02:19 +0200 | commented question | Error typesetting Hi, I had the same problem after the latest update on Ubuntu. I was using the AIMS ppa. Uninstalling the ppa package and manually installing the pre built binary for Ubuntu 14.04 fixed the issue. |

2015-03-11 20:35:01 +0200 | commented question | simplify_full() Maxima ECL error Thank you for filing a ticket. Hopefully it's fixed soon. |

2015-03-02 23:38:48 +0200 | asked a question | simplify_full() Maxima ECL error Hi all, the following code was working fine in 6.4.1 (I am using the AIIMS ppa in Ubuntu) and now after the 6.5 upgrade, it doesn't work anymore. Assume I have defined all variables. The problem is in simplify_full(). The erf function and their limits are not evaluated for some reason. I have a hunch this problem has been posted before but I am not sure. The full traceback is given below. Any help is appreciated. Thanks Update: I would like to add that the latest version of sage 6.7 still has this problem. Any updates? |

2015-03-02 22:55:52 +0200 | commented question | How to change default font-size in shift-click-created cells inside Sage Notebook? Did you figure out the solution for increasing font size while composing? |

2015-02-26 22:45:56 +0200 | commented question | Bug with absolute value of a complex variable? Thanks for asking this question. I had a similar problem in the latest release and this problem persists. Fortunately the workaround suggested by calc314 works. |

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2015-01-27 22:27:12 +0200 | commented answer | Attaching files in notebook does not update contents Ah I see, didn't know this was an ongoing issue. Sadly the "fix" is beyond my scope of the moment. Let's hope for the best. At least now I know my installation is not busted. |

2015-01-27 22:25:05 +0200 | commented question | Attaching files in notebook does not update contents You're right. Had a brain fart there. Edited |

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2015-01-27 04:30:02 +0200 | asked a question | Attaching files in notebook does not update contents Hello, I am running Sage 6.4.1. Using the notebook interface, attaching files does not work as the files contents are not reloaded automatically. It just shows me the previous variable values. As you can see the value of x isn't updated to 4. I can confirm that attach works as intended on the terminal, just the notebook interface is broken. |

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2014-12-19 04:14:35 +0200 | asked a question | How to delete blank text cells When I create a text cell and then click "Cancel Changes", the text cell does not delete and it stays taking up extra space in the notebook. Has anyone else encountered this? If so, then how do I go about deleting the extra blank text cells created? |

2014-10-07 22:58:01 +0200 | asked a question | Defining and manipulating vector equations with cross and dot products Hello, I have been experimenting with Sage to see what it can or can't do. Consider the following simple problem. Show $[ \mathbf{A} \times (\mathbf{B} \times \mathbf{C}) ] + [ \mathbf{B} \times (\mathbf{C} \times \mathbf{A}) ] + [ \mathbf{C} \times (\mathbf{A} \times \mathbf{B}) ] = 0 $ where $\mathbf{A}, \mathbf{B}, \mathbf{C} \in \mathbb{R}^3$. In Sage I can do this in one line where A,B and C are elements of $SR^3$. Now I can show component wise |

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