Logarithmic and exponenential functions - header file. More...
#include <itpp/config.h>
#include <itpp/base/help_functions.h>
#include <itpp/base/math/misc.h>
#include <limits>
Go to the source code of this file.
Namespaces | |
namespace | itpp |
itpp namespace | |
Functions | |
double | itpp::logb (double b, double x) |
Base-b logarithm. | |
int | itpp::pow2i (int x) |
Calculate two to the power of x (2^x); x is integer. | |
double | itpp::pow2 (double x) |
Calculate two to the power of x (2^x). | |
double | itpp::pow10 (double x) |
Calculate ten to the power of x (10^x). | |
double | itpp::dB (double x) |
Decibel of x (10*log10(x)). | |
double | itpp::inv_dB (double x) |
Inverse of decibel of x. | |
int | itpp::int2bits (int n) |
Calculate the number of bits needed to represent an inteager n . | |
int | itpp::levels2bits (int n) |
Calculate the number of bits needed to represent n different values (levels). | |
int | itpp::needed_bits (int n) |
Deprecated function. Please use int2bits() or levels2bits() instead. | |
double | itpp::trunc_log (double x) |
Truncated natural logarithm function. | |
double | itpp::trunc_exp (double x) |
Truncated exponential function. | |
double | itpp::log_add (double log_a, double log_b) |
Safe substitute for log(exp(log_a) + exp(log_b)) . | |
vec | itpp::exp (const vec &x) |
Exp of the elements of a vector x . | |
cvec | itpp::exp (const cvec &x) |
Exp of the elements of a complex vector x . | |
mat | itpp::exp (const mat &m) |
Exp of the elements of a matrix m . | |
cmat | itpp::exp (const cmat &m) |
Exp of the elements of a complex matrix m . | |
vec | itpp::pow (const double x, const vec &y) |
Calculates x to the power of y (x^y). | |
mat | itpp::pow (const double x, const mat &y) |
Calculates x to the power of y (x^y). | |
vec | itpp::pow (const vec &x, const double y) |
Calculates x to the power of y (x^y). | |
mat | itpp::pow (const mat &x, const double y) |
Calculates x to the power of y (x^y). | |
vec | itpp::pow2 (const vec &x) |
Calculates two to the power of x (2^x). | |
mat | itpp::pow2 (const mat &x) |
Calculates two to the power of x (2^x). | |
vec | itpp::pow10 (const vec &x) |
Calculates ten to the power of x (10^x). | |
mat | itpp::pow10 (const mat &x) |
Calculates ten to the power of x (10^x). | |
vec | itpp::log (const vec &x) |
The natural logarithm of the elements. | |
mat | itpp::log (const mat &x) |
The natural logarithm of the elements. | |
cvec | itpp::log (const cvec &x) |
The natural logarithm of the elements. | |
cmat | itpp::log (const cmat &x) |
The natural logarithm of the elements. | |
vec | itpp::log2 (const vec &x) |
log-2 of the elements | |
mat | itpp::log2 (const mat &x) |
log-2 of the elements | |
vec | itpp::log10 (const vec &x) |
log-10 of the elements | |
mat | itpp::log10 (const mat &x) |
log-10 of the elements | |
vec | itpp::logb (double b, const vec &x) |
log-b of x | |
mat | itpp::logb (double b, const mat &x) |
log-b of x | |
vec | itpp::dB (const vec &x) |
Calculates 10*log10(x). | |
mat | itpp::dB (const mat &x) |
Calculates 10*log10(x). | |
vec | itpp::inv_dB (const vec &x) |
Calulates the inverse of dB, 10^(x/10). | |
mat | itpp::inv_dB (const mat &x) |
Calculates the inverse of dB, 10^(x/10). | |
ivec | itpp::needed_bits (const ivec &v) |
Deprecated function. Please use int2bits() or levels2bits() instead. | |
ivec | itpp::int2bits (const ivec &v) |
Calculate the number of bits needed to represent each inteager in a vector. | |
ivec | itpp::levels2bits (const ivec &v) |
Calculate the number of bits needed to represent a numer of levels saved in a vector. | |
Variables | |
const double | itpp::log_double_max = std::log(std::numeric_limits<double>::max()) |
Constant definition to speed up trunc_log() and trunc_exp(). | |
const double | itpp::log_double_min = std::log(std::numeric_limits<double>::min()) |
Constant definition to speed up trunc_log(), trunc_exp() and log_add(). |
Logarithmic and exponenential functions - header file.
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IT++ - C++ library of mathematical, signal processing, speech processing, and communications classes and functions
Copyright (C) 1995-2008 (see AUTHORS file for a list of contributors)
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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Definition in file log_exp.h.
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