CAS bug when calculating sum(1/n,n,1,medium_value)
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10-13-2023, 06:53 AM
(This post was last modified: 10-14-2023 09:56 PM by ftneek.)
Post: #11
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RE: CAS bug when calculating sum(1/n,n,1,medium_value)
(10-10-2023 10:28 AM)parisse Wrote: Like for integration, if you want to compute a numeric approximation of a sum, you should give an approx input, for example sum(1.0/n,n,1,10000). That's what you do in Home, without having to explicitly convert 1 to 1.0, because HOME does approx computations. I tried sum(1.0/n,n,1,10000) as you entered in cas and home but it gave undef. I tried sigma notation in cas and home, home gave an approx solution while cas gave undef. I tried sum(1.0/n,n,1,2000000) in cas and home and it gave Psi(2000001)+euler_gamma (with comma separator in home). I tried with sigma notation in cas and home and approx lower bound, cas returned the exact answer again. Are you sure changing to approx input forces numeric computation? Edit: actually what I tried was sum(1/n,n,1.0,10000), apologies. Changing to 1.0/n does indeed show a numeric calculation in cas, but home still gives undef (after changing n to X). But sum(1.0/n,n,1,2000000) still gave still gave an answer in terms of Psi in home and cas, even when trying 1.0/n. - neek |
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