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Creating a large Data of a specified length
Posted: Sat Jul 20, 2019 3:26 pm
by DarScott
I have created a function in LCB that builds a Data filled with zeros based on a specified length. It works fine. (It uses put...after about 2.5log2n times.)
However, I'd like to improve speed. Is there a built-in method or trick or something I have missed?
Re: Creating a large Data of a specified length
Posted: Sat Jul 20, 2019 4:28 pm
by [-hh]
This needs at most log2(n) times "put after".
What's your handler? And what's your speed?
In LC Script this needs at about 1 second for 1 Gigabyte (2^30 Bytes) of data,
and < 20 ms for 17 Megabytes (2^24 Bytes) of data.
Here is the LC Script handler, the LC Builder handler could use the same "doubling-method".
Code: Select all
function createData m,n
put numToByte(m) into b
repeat log2(n)
put b after b
end repeat
return byte 1 to n of b
end createData
Re: Creating a large Data of a specified length
Posted: Sat Jul 20, 2019 7:23 pm
by DarScott
Thanks! An adaptation of that will beat my recursive function.
I wonder if there is something like "MCDataCreateOfLength" among the built-ins. (I just made up the name.)