Existing CAS commands > Prime discussion

11292018, 08:56 PM
Post: #44




RE: Existing CAS commands > Prime discussion
(11292018 05:51 PM)Joe Horn Wrote:(11292018 05:18 PM)ijabbott Wrote: Looking at the Giac/Xcas source code for exact and float2rational, they follow different code paths, but do similar things. The main functional difference seems to be that exact imposes a minimum epsilon value of 1e14, whereas float2rational imposes a minimum epsilon value of 1e11. I don't know if the minimum values of epsilon for exact() and float2rational() are different on the Prime, but the values I gave are accurate for the upstream Xcas source. I.e. for float2rational(), setting epsilon to anything less than 1e11 behaves the same as setting it to 1e11. Similarly for exact() with an epsilon less than 1e14. The float2rational() function sometimes "gives up" and gives you the float back, which is another reason for not implementing it! — Ian Abbott 

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