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class method
Math.sqrt
Math.sqrt(x) → Float
math.c
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static VALUE
math_sqrt(VALUE unused_obj, VALUE x)
{
return rb_math_sqrt(x);
}
Returns the non-negative square root of x.
Domain: [0, INFINITY)
Codomain:[0, INFINITY)
Example
0.upto(10) {|x| p [x, Math.sqrt(x), Math.sqrt(x)**2] } #=> [0, 0.0, 0.0] # [1, 1.0, 1.0] # [2, 1.4142135623731, 2.0] # [3, 1.73205080756888, 3.0] # [4, 2.0, 4.0] # [5, 2.23606797749979, 5.0] # [6, 2.44948974278318, 6.0] # [7, 2.64575131106459, 7.0] # [8, 2.82842712474619, 8.0] # [9, 3.0, 9.0] # [10, 3.16227766016838, 10.0]
Note that the limited precision of floating point arithmetic might lead to surprising results:
Example
Math.sqrt(10**46).to_i #=> 99999999999999991611392 (!)
See also BigDecimal#sqrt and Integer.sqrt.