i am trying to multiply several integers modulo small prime number here and
fail at that.
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NB. highest power of prime x that divides !y
pffact=:([: +/ ] <.@% [ ^ 1 + [: i. <.@^.)
P=:9+1e9
pw=.1e9 pffact">~ pr=.p:i.240 NB. first few primes and their powers
1 p: P NB. P is prime
1
datatype P
integer
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here is a list of integers I am trying to multiply
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mul=.1+pr (P&|@^) 2 (P&|@*) pw
datatype mul
integer
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And here is what happens when I actually multiply them:
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P&|@*/ mul
0
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which is not the right answer
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P&|@*/ |.mul
3.90562e7
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