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a C library for Big Interger KDB+ Arithmetic

Overview

Function: add, sub, mul, div, cmp

Inputs: pass in x and y as strings of large numbers in base 2, 10 or 16 ... 62

Outputs: string number in specified base

Setup:

Install GMP library with get_gmp.sh

GMP library website

Compile C bigint libraries (examples for 64 bit kdb)

  • Windows dll compilation using VS: `
    cl /LD /DKXVER=3 bigint.c bigint.def q.lib -lgmp
  • Linux so compilation using gcc:
    gcc -D KXVER=3 -Wall -fno-strict-aliasing -Wno-parentheses -g -O2 -shared -fPIC -o bigint.so bigint.c -lgmp
  • Mac so compilation using gcc:
    gcc -bundle -undefined dynamic_lookup bigint.c -o bigint.so -lgmp

Load function in kdb

bigAdd:`bigint 2:(`add;3)

bigSub:`bigint 2:(`sub;3)

bigMul:`bigint 2:(`mul;3)

bigDiv:`bigint 2:(`divy;3)

bigCmp:`bigint 2:(`cmp;3)

Use in kdb

q)bigAdd:`bigint 2:(`add;3)
q)bigSub:`bigint 2:(`sub;3)
q)bigMul:`bigint 2:(`mul;3)
q)bigDiv:`bigint 2:(`divy;3)
q)bigCmp:`bigint 2:(`cmp;3)

q)base:16;
q)x:"4ee2d6d415b85acef8100000000";
q)y:"ff";

q)bigAdd[x;y;base]
base = 16
x = 4ee2d6d415b85acef8100000000
y = ff
z = 4ee2d6d415b85acef81000000ff

"4ee2d6d415b85acef81000000ff"

q)bigSub[x;y;base]
base = 16
x = 4ee2d6d415b85acef8100000000
y = ff
z = 4ee2d6d415b85acef80ffffff01

"4ee2d6d415b85acef80ffffff01"

q)bigMul[x;y;base]
base = 16
x = 4ee2d6d415b85acef8100000000
y = ff
z = 4e93f3fd41a2a2742917f00000000

"4e93f3fd41a2a2742917f00000000"

q)bigDiv[x;y;base]
base = 16
x = 4ee2d6d415b85acef8100000000
y = ff
z = 4f3208dcf2ab05d4ccdcdcdcd

"4f3208dcf2ab05d4ccdcdcdcd"

q)bigCmp[x;y;base]
3i
q)bigCmp[y;x;base]
-3i
q)bigCmp[y;y;base]
0i

License

Licensed under either of

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Universal Permissive License v 1.0 license, shall be dual licensed as above, without any additional terms or conditions.