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2020-05-09 22:46:14 +0200 | asked a question | Problems with scipy's optimize I have a random bug with scipy's optimize . I use it in the context of SageMath 9 (Python 3.7.3). I checked 3 algorithms : shgo, dual_annealing and full_optimize. All don't work well (at all !). I optimise with a 3 parameters functions with given bounds. The algorithm randomly sends to my error function the "1e-8" value for any of the 3 parameters. I displayed the vector + error to understand it. AS you can see, in this case, the first parameter is 1e-8 whereas it is outside the bounds. Sometimes it happens for the second parameter, or the 3rd .... The behaviour is the same for all of them. However the value inserted is not always the same, I noticed 3 : 1e-10, 1e-8 and 1.49011612e-08 Moreover, all do not send nice values. For example, the full_optimize always send values close to the highest bound. Perhaps are the value computed with a simple linear average and I guess it should not be the case. my bounds are : with e=1.6e-19 Is there an alternative for optimization in sagemath ? regards, Mike |
2020-04-03 20:13:52 +0200 | asked a question | Cython class : iterate over cdef'ed members Dear all, my question is in the title : for some reason it may be usefull to me to iterate over a cdef'ed class cdef'ed members. I inherit from sage.calculus.ode.ode_system for ODE computation. All the members have default values and I want to customize some of them. The aim of this iteration through the members should be to associate a value from the "pdict" parameter of setParam. This parameter is intended to associate keys which names are Asi, NSi, etc, with their new value. I tried by generating a string and using "exec" but it did not work, i belive it coms from cython itself. I am not sure it is possible that way, but that seemed to be an efficient way to change only the wanted paremeters. Is that possible ? Regards, Mike |
2020-04-03 20:05:31 +0200 | commented answer | Interactive plots Thank you for your answer. I am sorry to answer so late, I wes not notified (for any reason ?) by the site. |
2020-04-03 20:05:26 +0200 | commented answer | Interactive plots Thank you for your answer. I am sorry to answer so late, I wes not notified (for any reason ?) by the site. |
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2019-12-10 18:40:48 +0200 | asked a question | Interactive plots Dear all, I am new to Python and sagemath as well, I am however a skilled coder in other languages such as C/C++, Matlab, etc. I work in a university and we think about switching from matlab to python, and I have found in sagemath a very intersting use of python for scientific computing. I explore the possibilities of python for that purpose. Something that misses in the tries I made is the mouse interactivity with plots (such as zoom for 2d plot or rotation for 3d plot). I used basic Matplotlib. I have read that it is possible with python itself and what limits mouse interactivity seems to come from the web-page orientation of jupyter. I have seen somewhere that in Jupyter, the following : %matplotlib notebook may enable the interactivity. However it does not seem to work in Sagemath. So I have questions : I want to have interactivity. Is it possible with Matplotlib in Sagemath or is planed for a future version ? Else : may I use another library than Matplotlib, and which one may I use ? My typical needs are large amount of points plotting (experimental data), and 3d plotting. Best regards, Mike |