sqrt and log of rational series #18

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1. Sergey-A-Dovgal

   changed the title [-]sqrt anf log of rational series[/-] [+]sqrt and log of rational series[/+] on Jul 21, 2021
2. oscarbenjamin commented on Aug 26, 2024

   

   oscarbenjamin

   on Aug 26, 2024

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   This one seems to be working fine now with python-flint 0.6.0:

   In [1]: import flint
      ...: 
      ...: QQ = flint.fmpq
      ...: log = flint.fmpq_series.log
      ...: 
      ...: # this one works ok
      ...: print(log(flint.fmpq_series([1,1])))
      ...: 
      ...: # here is I get ValueError: log() of power series: constant term must be one
      ...: print(log(flint.fmpq_series([1,1,QQ(3,8)])))
   x + (-1/2)*x^2 + 1/3*x^3 + (-1/4)*x^4 + 1/5*x^5 + (-1/6)*x^6 + 1/7*x^7 + (-1/8)*x^8 + 1/9*x^9 + O(x^10)
   x + (-1/8)*x^2 + (-1/24)*x^3 + 7/128*x^4 + (-11/320)*x^5 + 23/1536*x^6 + (-13/3584)*x^7 + (-17/16384)*x^8 + 73/36864*x^9 + O(x^10)

   Looks like it was fixed in c715d51 from gh-39 so python-flint 0.4.0.
3. oscarbenjamin

   closed this as completedon Aug 26, 2024