Hello, I have 2 matrices: Prec and M.
>sage: Prec.parent Full MatrixSpace of 4 by 4 dense matrices over Rational Field >sage: M.parent() Full MatrixSpace of 4 by 4 dense matrices over Rational Field >sage: Prec.is_symetric() True ok. I also know that Prec is positive. Then, I do: >sage: LC=Prec.cholesky() >sage: LC.parent() Full MatrixSpace of 4 by 4 dense matrices over Algebraic Field This is ok. sage: print LC.list()[0.004892377274102731?, 0, 0, 0, 0, 0.002329237476562281?, 0, 0, -0.001531556341905637?, 0, 1/640, 0, 0, -0.0007624219319910414?, 0, 0.001320553523013307?]
Everyting seems ok. sage: LCt=LC.transpose() sage: LCt.parent() Full MatrixSpace of 4 by 4 dense matrices over Algebraic Field ok! (of course). sage: Z=LC*mfeEast*LCt sage: Z.parent() Full MatrixSpace of 4 by 4 dense matrices over Algebraic Field This is perfect. ------------------------------- NOW, my problem: M1=Z.change_ring(RDF) enters an infinite loop.... ------------------------------ For information: sage: version() 'SageMath Version 6.6, Release Date: 2015-04-14' sage: print Z.list()[-921701247242812313477843412582400000/940135272187668275673825470054308951, 0.7276068751089991?, -0.1831867383804206?, 0.04189076099436858?, -0.7276068751089991?, 7537097158939877741566487100/14132057173012271380088361929, -0.1186331808041865?, -0.001369231431906186?, -0.1831867383804206?, 0.1186331808041865?, 0.010771471259174368?, -0.07650322439253288?, -0.04189076099436858?, -0.001369231431906186?, 0.07650322439253288?, -0.1562464847599110?]
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