log2

dissect floating-point numbers into base 2 exponent and mantissa.

Syntax

  • R = log2(M)

  • [F, E] = log2(M)

Input argument

  • M - a variable: a matrix

Output argument

  • R - result of log2: computes the base 2 logarithm of the elements of X.

  • F - Mantissa values that satisfy this equation: M= F.*2.^E

  • E - Exponent values that satisfy this equation: M= F.*2.^E

Description

log2 dissects several numbers into the exponent and mantissa.

[F, E] = log2(M), any zeros in M produce F = 0 and E = 0.

Input values of Inf, -Inf, or NaN are returned unchanged in F with a corresponding exponent of E = 0.

Used function(s)

std::frexp and std::logb C++ functions

Example

x = [1+i,-i;i,2i];
R = log2(x)
[F, E] = log2(x)

See also

log, log10.

History

Author

Allan CORNET

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