posted 6 years ago
331(t+273) ^1/2
_____
( 273 )
331 multiply t+273/273 the result is exponent 1/2
how do you write this equation in java using math.class
thanks
_____
( 273 )
331 multiply t+273/273 the result is exponent 1/2
how do you write this equation in java using math.class
thanks
Juan Villena
Greenhorn
Posts: 20
posted 6 years ago
There's also a method Math.pow which takes two doubles. You could use that if the exponent is a fraction other than 0.5.
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posted 6 years ago
Don't use Math,pow(x, 2) for squares. Use x * x instead.
. . . or 0.3333333333333333333333333333333333333333333 because there is a cube root method too.Rob Spoor wrote:There's also a method Math.pow which takes two doubles. You could use that if the exponent is a fraction other than 0.5.
Don't use Math,pow(x, 2) for squares. Use x * x instead.
Juan Villena
Greenhorn
Posts: 20
posted 6 years ago
Jesper the jonq, actually , i want to square root the whole equation, an\d is 331
Rob Spoor and Campbell Ritchie: so can i use math.pow in this particular ecuation or just math.sqrt
and can you tell if this is right or wrong : 331*(math.sqrt((t*273)/273)
or can you guys write this ecuation using math class please.
thanks a lot
Rob Spoor and Campbell Ritchie: so can i use math.pow in this particular ecuation or just math.sqrt
and can you tell if this is right or wrong : 331*(math.sqrt((t*273)/273)
or can you guys write this ecuation using math class please.
thanks a lot
posted 6 years ago
<pedant>
There is no such thing as a 'math' class in java. There is, however, a Math class.
</pedant>
There is no such thing as a 'math' class in java. There is, however, a Math class.
</pedant>
There are only two hard things in computer science: cache invalidation, naming things, and offbyone errors
Campbell Ritchie
Marshal
Posts: 57470
175
posted 6 years ago
If you want the square root of the whole equation, then you should obviously put the whole equation between the brackets for the method call to Math.sqrt:
So, Math.sqrt(331 * ...) and not 331 * Math.sqrt(...)
So, Math.sqrt(331 * ...) and not 331 * Math.sqrt(...)
Ulf Dittmer
Rancher
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Campbell Ritchie
Marshal
Posts: 57470
175
posted 6 years ago
I think Jesper has seen the error and inadvertently corrected it from * to +. With 273 in, probably something to do with absolute temperatures.
Beware of integer arithmetic: for any t such that t < 273 and t ≥ 0, the result of the division will turn out to be 1, if t is an integer.
Beware of integer arithmetic: for any t such that t < 273 and t ≥ 0, the result of the division will turn out to be 1, if t is an integer.
Juan Villena
Greenhorn
Posts: 20
posted 6 years ago
Did you read the API on the Math class? It tells you quite clearly:
so if you want the square root, you use this.
If you want to raise a number to some arbitrary power, you use this.
Since raising a number to the 1/2 power is BY DEFINITION taking the square root, you can use either one you want.
static double sqrt(double a)
Returns the correctly rounded positive square root of a double value.
so if you want the square root, you use this.
static double pow(double a, double b)
Returns the value of the first argument raised to the power of the second argument.
If you want to raise a number to some arbitrary power, you use this.
Since raising a number to the 1/2 power is BY DEFINITION taking the square root, you can use either one you want.
There are only two hard things in computer science: cache invalidation, naming things, and offbyone errors
Campbell Ritchie
Marshal
Posts: 57470
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posted 6 years ago
Actually if you give the exponent 1 / 2, you will receive the result 1.0.
The reason is that 1 / 2 is integer arithmetic, and will return 0, so you will get x to the power of 0, and that returns 1.
I would say, if they have got a method which is specially designed for square roots, use that method. It's easier for a start.
The reason is that 1 / 2 is integer arithmetic, and will return 0, so you will get x to the power of 0, and that returns 1.
I would say, if they have got a method which is specially designed for square roots, use that method. It's easier for a start.
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