Elementary functions

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

History

Version	Description
1.0.0	initial version

Author

Allan CORNET

Elementary functions