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Re: rand() precision low, looking for a fast way to get high precision rand float?by BrowserUk (Patriarch) |
on Oct 31, 2012 at 17:15 UTC ( [id://1001714]=note: print w/replies, xml ) | Need Help?? |
I want if() to be true at a rate of 1/40.000, however, rand() is not precise enough and outputs 0 quite often That's not the way random works. It doesn't guarantee 1/40000, if it did, it would not be "random". It only guarantees that the ratio will tend towards 1/40000 over time. Most times it will produce 1/40000; but sometimes it will be 0/40000; sometimes 2/40000; occasionally 3/40000; very occasionally even 4/40000; but over time they will tend to balance each other out and the ratio will tend to get closer and closer to 1/40000. Try running this for a while to see how it works:
If you need to always get one true from every 40,000, then use:
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