modular arithmetics for big numbers

[Pawel Jakubas]

hi J enthusiasts,

I have been trying recently https://code.jsoftware.com/wiki/Vocabulary/mdot and it seems it does not work for big numbers. Any plans to support that in the future?

Or there is a way to use it with arbitrary big integer and I am missing something?

Thanks and cheers,

Pawel

[Pascal Jasmin]

0 + m.4234823749283749283749283742938742x (7 8 9 1283127398127391387123123x)

7 8 9 1283127398127391387123123

is there a different issue?

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[Clifford Reiter]

I suspect you are using floating type.

You can use extended integers if your integers are biggish.

_1+2^20

1.04858e6

datatype _1+2^20

floating

]M=:_1+2^20x

1048575

datatype M

extended

]X=:_1+2^21x

2097151

]Y=:_1+2^24x

16777215

X * m. M Y

15

M|X * Y

15

If you are having problems using m. with extended integers, please share an example.

[Pawel Jakubas]

thanks!

indeed, floating type number sneaked in in one place. 

cheers,

Pawel