, but that does not initialize to 0, but to
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I always thought raster was lossy and vector was not lossy, is this true?
// will generate random integers from 1 to 4 var frequencies = [ 0, 0, 0, 0, 0 ]; // not using the first place var randomNumber; for ( var i = 0; i 1*1000*1000; ++i ) randomNumber = Math.ceil(Math.random()*4); frequencies[randomNumber]++; for ( var i = 1; i = 4; ++i ) console.log(i +: + frequencies[i]);
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Ive seen a lot of code where random numbers are generated like
Anyway, I feel like Im missing something. Why dont people use the more succint way
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as stated inMDN referenceaboutMath.random()
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It would be a very bad way to get random numbers in the range of [0,10] when using ceil(), because zero effectively is starved.
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I tried to test the randomness and it seems true so far.
the correct function to use when you want to generate random integers. Always use
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and then add the lower limit if it is nonzero. Taking your second example of
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as an attempt to get numbers 0 through 10, the correct way to do this would be
Yes quite right… but it would be a shame to have some part of a system fall over one day because of a
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Since Math.random can return0, thenMath.ceil(Math.random()*10)could also return0and that value is out of your[1..10]range.
Math.floor()is preferred here because of the range ofMath.random().
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The fact that 0 is almost never taken is not a rare condition though.
random integers in the interval [1, 10]:
For instance,Math.random() * 10gives a range of[0, 10). UsingMath.floor()you willneverget to the value of10, whereasMath.ceil()maygive0.
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Not sure what you mean. But, if you are counting on 0 not being returned by the random() call then one day you may be unpleasantly surprised. Thats all Im saying. Also the whole point of this answer is to illustrate the difference between the 2 – he was implying they were the same…
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Also interesting to find that Math.ceil is ~90% slower than Math.floor /convert-to-integer
Quick OT: Is there a more succint way to declare and initialize frequencies? I mean likefrequencies = 0 ;from C++…
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random integers in the interval [0, 10]:
Returns a floating-point, pseudo-random number in the range [0, 1) that is, from 0 (inclusive) up to but not including 1 (exclusive), which you can then scale to your desired range.
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