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2019-06-09 16:07:59 +0100 | commented answer | construct matrix from equations Thank you very much! Python is on my to-do list; it seems to be very useful for Sage. |

2019-06-09 13:06:40 +0100 | asked a question | construct matrix from equations I have derived 3 linear equations symbolically with variables C4, C5 and C6, and I would like to convert these into matrix-vector format The equations to put in matrix-vector format: Then I created the next matrix by hand; but I assume there is a smarter way to construct a matrix: |

2019-06-08 15:32:59 +0100 | commented answer | reverse y-axis graph Thank you! |

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2019-06-06 11:40:41 +0100 | asked a question | reverse y-axis graph I'm sorry for asking trivial things, but I can't find this in the reference manual. I have produced a graph by plotting a function simply by putting a minus sign in front of the function. But I actually want to reverse the axis to get positive values in the downward direction. Is it possible to achieve this? (I am unable to post the graph, because my karma < 60) |

2019-06-06 10:59:46 +0100 | commented answer | substitute variables into values It works great! Thank you! The code gets more compact this way. |

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2019-06-06 01:18:35 +0100 | asked a question | substitute variables into values (Edit: I have recently started with Sagemath for an engineering course I am attending. I don't have access to Maple or Mathematica, so I wanted to give Sagemath a try. I am trying to combine info and examples from several sources but sadly I don't have any experience with Python) I am trying to use Sagemath for a mechanics problem, for which I am at first solving a DE symbolically and later on assign physical properties to the parameters and finally plot the result. (It's a 2nd order bending problem) There are quite some parameters that I have to use, some parameters have to be expressed in terms of other parameters. From this point on I want to assign values to variables, and express variables by means of other variables. I don't know how to substitute the kt, qzc and the K's in this function. |

2019-06-05 12:52:52 +0100 | commented answer | How to use equation solutions returned by `solve`? Thank you very much, I will try these out. |

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2019-06-05 12:22:40 +0100 | asked a question | How to use equation solutions returned by `solve`? While obtaining the answer for A3 and A3 in a set of equations, the answer is in vector-format(??). I want to use these answer further on. How can I pick these values? Right now I just copy and paste the answer but that's not ideal. IN: OUT: How to get A3=... and A4=... |

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