dt.uint64

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This example writes a numeric value in double floating point format using raw datatype. If the resulting value is incorrect try removing the line with reverse() call.

Code:

val = 123456.67890

ffi = require('ffi')

dst = ffi.new('unsigned char[8]')
src = ffi.new('double[1]')

src[ 0 ] = tonumber(val) or 0

ffi.copy(dst, src, 8)

res = ffi.string(dst, 8)
res = res:reverse()

grp.write('2/2/2', res, dt.raw)