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Hello again! I've found the answer to my question: the problem was due to different versions of numpy in my system and in sage package! It's a shame that Sage's version is so old! I had to update the numpy in Sage to version 1.7

Hello again! I've found the answer to my question: the problem was due to different versions of numpy in my system and in sage package! It's a shame that Sage's version is so old! I had to update the numpy in Sage to version 1.71.7 This is done by installing numpy to ...sage-5.6/local folder (see the numpy building manual)