Is it possible to call the primesieve (Kim Walisch tool), from the pari/gp and pass the value in a variable in pari/gp? I would like to replace the primePi () function with this (as external function, maybe with system("f") command), because the premisieve is much faster to find prime numbers.
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I haven't tried interfacing with primesieve, but you can definitely use the system function to call external programs. The details will vary slightly depending on what operating system you have.
On Windows:
system(Str("echo ", 17, ">c:/work/temp.txt"))
will call the echo command passing it a value of 17 and writing the output to a temporary file. (Note that I am using forward slash (/) in the path, rather than Windows normal backslash (\) because a backslash is also PARI's string escape character.
Then to read the result back into PARI:
read("c:/work/temp.txt")
seems to do the trick.
Andrew
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You can also use `externstr`. – Charles Mar 27 '20 at 19:46