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2022-05-04 01:06:14 +0200 | edited question | Jacobi theta q series Jacobi theta q series I'd like to express the classical Jacobi theta series in Sage: $$\Theta_2(z) &= \sum_{n\in{\m |
2022-05-04 01:00:32 +0200 | asked a question | Jacobi theta q series Jacobi theta q series I'd like to express the classical Jacobi theta series in Sage: \begin{align} \Theta_2(z) &= \ |
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2020-03-10 03:34:19 +0200 | commented question | Unimodular matrices with additional restrictions Good point. This certainly works if the dimension is 8 e.g. the $E_8$ root lattice gram matrix: E8 lattice wiki. I edited the post. Thank you |
2020-03-09 18:56:08 +0200 | asked a question | Unimodular matrices with additional restrictions I'd like to generate some unimodular matrices over ZZ with some restrictions:
Item (1) above can be addressed with the option becomes extremely inefficient, especially as the dimension grows. Is there a way to enforce items (1),(2) within the unimodular algorithm? Or another workaround? Edit: I originally also wanted the diagonal entries fixed at 2, but this is a bit too restrictive. |
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2020-02-26 18:30:01 +0200 | commented answer | continuous Fourier transform Thank you! |
2020-02-26 18:29:50 +0200 | commented answer | continuous Fourier transform Thank you! |
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2020-02-19 20:38:32 +0200 | asked a question | continuous Fourier transform I have some basic code to plot a "nice" real-valued function and its continuous Fourier transform. For example, Like many things in Sage, I appreciate it when the code looks like the formal math. However, this code is not robust. For instance, if we change the function to Then I get an error message "Variable 'xi' not found". I'd like to improve this code to work with a wider class of functions. Thanks, |
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2018-07-01 00:13:48 +0200 | commented answer | Solving a power series equation The workaround on the above thread works well. Thanks for the help! |
2018-06-30 22:58:02 +0200 | commented answer | Solving a power series equation When I run this code I get the following traceback error: ValueError: rtol too small (4.5e-16 < 8.88178e-16) I'm not sure what this means or why it's happening. |
2018-06-29 19:52:53 +0200 | asked a question | Solving a power series equation I'd like to solve the equation I've tried simply plugging in values for t and I estimate that if f(t) = 1 then t is approximately 1.51. I'd like to possibly do something like but this appears to lock sage up and I have to interrupt the process. The true f function is actually an infinite series, but I am truncating it to the first 1000 terms. I know there are methods of solving series equations such as the method of regula falsi. Does Sage have anything like this? Thanks! |
2018-04-22 20:45:13 +0200 | asked a question | problem loading large file I have a file which was generated and saved from a Sage notebook worksheet:
where When I try to load this file later to do some analysis
my computer goes deep into swap memory (with python eating it all up) and basically freezes. I have done the exact same thing for smaller file sizes (<10Mb) with no issues. I've tried waiting over 30 minutes and nothing seems to happen. Is this possibly a memory issue? Something with Sage? Possible workaround? I'm running the Sage notebook in fedora linux with an older laptop with 8Gb of RAM. Thanks! |
2018-04-02 05:13:06 +0200 | commented answer | 3d plot, slow Great, thanks for the help! |
2018-03-22 21:52:29 +0200 | commented question | 3d plot, slow Also, is there a way to crank up the resolution so the spheres don't look pixelated? |
2018-03-22 19:47:01 +0200 | asked a question | 3d plot, slow I have some graphical objects (spheres and planes) and I'm trying to create a nice picture to export as a .png (other options?). The problem I'm having is that the interactive mode (right clicking on the graphic) is so slow that the menu options freeze up. I'd like to preview the image (rotate it around, zoom, etc.) before saving so that I can make sure I've got the right picture. What is a more efficient/ faster way to create and export a 3d picture? Thanks!
Also, if I try
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2018-02-01 16:25:51 +0200 | commented answer | random matrix with determinant +- 1 This works. Nice simple solution. Thanks Dan. |