2020-12-17 00:44:47 +0100 received badge ● Famous Question (source) 2017-03-20 12:04:31 +0100 received badge ● Notable Question (source) 2016-07-02 00:33:07 +0100 received badge ● Popular Question (source) 2014-11-18 08:04:33 +0100 received badge ● Notable Question (source) 2014-05-23 07:53:45 +0100 received badge ● Popular Question (source) 2013-10-20 22:34:07 +0100 marked best answer integration ends up with hypergeometric function can not be done by sage It seems sage's default algorithm can't do it. You can use mathematica's algorithm to do it in sage. You don't need mathematica installed on you computer. Just type the following command. b=var('b') integral(1/(x^b+1),x,algorithm='mathematica_free')  2013-10-16 20:57:57 +0100 asked a question integration ends up with hypergeometric function can not be done by sage we know the integration of 1/(a^b+1)  with respect to a is going to get 2F1(1,1/a,1+1/a,-a^x) where 2f1 is hypogeometric function. However, once we to that in sage, it is not possible to get results sage: integrate(1/(x^b+1),x) integrate(1/(x^b + 1), x)  hope this can be fixed up latter or have some alternative way to work around. 2013-10-09 20:35:40 +0100 commented answer How to output numerical array (matrix) out as hdf5 format? I tried to install that in my scientific linux but still the same error occurs. It may caused by low version of gcc, not the problem of sage. 2013-10-09 07:26:02 +0100 answered a question How to output numerical array (matrix) out as hdf5 format? I think this is a problem to the linux system i use (Scientifc linux) Once I tried to compile h5py in another genoo pc, it works great 2013-10-09 02:26:33 +0100 asked a question How to output numerical array (matrix) out as hdf5 format? I wish to use some other tools to further processing the data generated by sage. the output format should be in hdf5 format. However, it seems very hard to install h5py because it depends on HDF5. so when i run ./sage --python setup.py build  to install h5py, it say sh5py/api_compat.h:21:18: fatal error: hdf5.h: No such file or directory  so how do you handle hdf5 format in sage, or do you have anyideas to get around this problem (the dataset may be huge so output into txt file may not be practical.) 2013-10-09 02:20:56 +0100 commented answer How to assign matrix (vector) value to variable Thanks! this does the trick for me! 2013-10-09 02:20:36 +0100 received badge ● Scholar (source) 2013-10-09 02:20:36 +0100 marked best answer How to assign matrix (vector) value to variable In programs like Numpy or R, this would be very reasonable behavior to expect. Those are data analysis tools. R: > sin(c(1,2,3,4)) [1] 0.8414710 0.9092974 0.1411200 -0.7568025  Numpy: sage: import numpy as np sage: sin(np.array([1,2,3,4])) array([ 0.84147098, 0.90929743, 0.14112001, -0.7568025 ])  Sage is mathematical, however. So you will have to explicitly apply the function to all entries. Python makes this easy using list comprehensions or the map function. sage: [sin(l).n() for l in [1,2,3,4]] [0.841470984807897, 0.909297426825682, 0.141120008059867, -0.756802495307928] sage: map(sin,[1,2,3,4]) [sin(1), sin(2), sin(3), sin(4)] sage: map( lambda x: sin(x).n(), [1,2,3,4]) [0.841470984807897, 0.909297426825682, 0.141120008059867, -0.756802495307928]  2013-10-08 21:17:13 +0100 received badge ● Supporter (source) 2013-10-08 21:14:44 +0100 asked a question How to assign matrix (vector) value to variable when I tried to assign a matrix or a vector to variables, something wrong happens: sage: sin([1,2,3,4]).n() Traceback (click to the left of this block for traceback) ... TypeError: cannot coerce arguments: no canonical coercion from to Symbolic Ring  what I want to achieve is that the out put gives a vector that equals to [sin(1),sin(2),sin(3),sin(4)]. Thanks in advance!