md_src_plugins_mathcheck_README(3) README

Examples

check/math = '== + testval1 + testval2 testval3' compares the keyvalue to the sum of testval1-3 and yields an error if the values are not equal. check/math = '\<= - testval1 * testval2 testval3' tests if the keyvalue is less than or equal to testval1 - (testval2 * testval3) and yields an error if not.

Full example: 

    kdb mount mathcheck.dump /example/mathcheck dump mathcheck
    kdb set user/example/mathcheck/a 3.1
    kdb set user/example/mathcheck/b 4.5
    kdb set user/example/mathcheck/k 7.6
    kdb setmeta user/example/mathcheck/k check/math "== + a b"
    kdb set user/example/mathcheck/k 7.7   # fails

To calculate values on-demand you can use: 

    kdb setmeta user/example/mathcheck/k check/math ":= + a b"
    kdb get user/example/mathcheck/k       # 12.5
    kdb set user/example/mathcheck/a 5.5
    kdb get user/example/mathcheck/k       # 10

It also works with constants: 

    kdb setmeta user/example/mathcheck/k check/math ":= + a '5'"
    kdb get user/example/mathcheck/k       # 10.5
    kdb set user/example/mathcheck/a 8.0
    kdb get user/example/mathcheck/k       # 13


 

LAST SEARCHED