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Topic: testing for inf. and NaN (Read 1085 times) |
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battey
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testing for inf. and NaN
« on: Oct 4th, 2003, 7:48am » |
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I'm doing some chaos code where I need to test for values going into the stratosphere so I know I need to abandon the randomly generated initial conditions.
By hunting through Java documentation, I found a method for testing for infinity that works in P5:
newx==Float.POSITIVE_INFINITY
but I haven't been able to figure out how to test for NaN.
newx==Float.NaN doesn't seem to do it. Doesn't generate an error, but also doesn't trap:
float x=Float.NaN;
if(x==Float.NaN)
{
println("Not a number");
}
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fry
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Re: testing for inf. and NaN
« Reply #1 on: Oct 4th, 2003, 3:56pm » |
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the nan test is also the same as java:
if (Float.isNaN(someNumber)) {
println("not a numbah");
}
since it's literally 'not a number', it doesn't equal anything, so == doesn't work.
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