log2

log2(x)

Compute the logarithm of x to base 2. Throws DomainError for negative Real arguments.

Examples

  1. Calculate log base 2 of a positive number:

    julia> log2(8)
3.0

    This example calculates the logarithm base 2 of the number 8, which is 3.

  2. Calculate log base 2 of a fraction:

    julia> log2(0.5)
-1.0

    The log2 function can handle fractional inputs. In this example, it computes the logarithm base 2 of the fraction 0.5, which is -1.

  3. Throw an error for negative real numbers: 
    julia> log2(-10.0)
ERROR: DomainError with -10.0:
log2 will only return a complex result if called with a complex argument. Try log2(complex(x)).

    The log2 function throws a DomainError when called with a negative real number. It suggests using log2(complex(x)) if a complex result is desired.

Common mistake example:

julia> log2(-5)
ERROR: DomainError with -5:
log2 will only return a complex result if called with a complex argument. Try log2(complex(x)).

In this example, the log2 function is called with a negative integer, which results in a DomainError. Remember that log2 is only defined for positive real numbers.

See Also

abs2, beta, binomial, ceil, cell, cross, ctranspose, ctranspose!, cummin, cumprod, cumprod!, cumsum, cumsum!, cumsum_kbn, div, divrem, eigfact, eigfact!, eigmin, eps, erf, erfc, erfcinv, erfcx, erfi, erfinv, exp, exp10, exp2, expm1, exponent, factor, factorial, factorize, floor, gcd, invmod, log, log10, log1p, log2, logspace, max, min, mod, mod1, modf, next, nextpow, nextprod, num, primes, primesmask, prod, realmin, sqrt, sum!, sumabs, sumabs!, sumabs2, sumabs2!,

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