#include <itpp/config.h>
#include <itpp/base/itassert.h>
#include <complex>
#include <limits>
Go to the source code of this file.
Namespaces | |
namespace | itpp |
Functions | |
double | asinh (double x) |
Arcus sinhyp. | |
double | acosh (double x) |
Arcus coshyp. | |
double | atanh (double x) |
Arcus tanhyp. | |
double | tgamma (double x) |
True gamma function. | |
double | lgamma (double x) |
Lograrithm of an absolute gamma function. | |
double | cbrt (double x) |
double | trunc_log (double x) |
Truncated natural logarithm function. | |
double | trunc_exp (double x) |
Truncated exponential function. | |
double | log2 (double x) |
Base-2 logarithm. | |
double | logb (double b, double x) |
Base-b logarithm. | |
double | sinc (double x) |
Sinc function. sinc(x) = sin(pi*x)/pi*x. | |
int | round_i (double x) |
Round to nearest integer. | |
int | ceil_i (double x) |
The nearest larger integer. | |
int | floor_i (double x) |
The nearest smaller integer. | |
double | round (double x) |
Round to nearest integer, return result in double. | |
bool | is_int (double x) |
Return true if x is an integer. | |
bool | is_even (int x) |
Return true if x is an even integer. | |
int | int2bits (int n) |
Calculate the number of bits needed to represent an inteager n . | |
int | levels2bits (int n) |
Calculate the number of bits needed to represent n different values (levels). | |
int | needed_bits (int n) |
Deprecated function. Might be removed in future releases. Please use int2bits() or levels2bits() instead. | |
int | needed_bits (double n) |
Deprecated function. Might be removed in future releases. Please use int2bits() or levels2bits() instead. | |
int | pow2i (int x) |
Integer 2^x. | |
int | pow2 (int x) |
Calculate two to the power of x (2^x). | |
double | pow2 (double x) |
Calculate two to the power of x (2^x). | |
double | pow10 (double x) |
Calculate ten to the power of x (10^x). | |
double | dB (double x) |
Decibel of x (10*log10(x)). | |
double | inv_dB (double x) |
Inverse of decibel. | |
int | gray_code (int x) |
Convert to Gray Code. | |
double | rad_to_deg (double x) |
Convert radians to degrees. | |
double | deg_to_rad (double x) |
Convert degrees to radians. | |
double | sqr (double x) |
Square of x. | |
double | sqr (std::complex< double > x) |
Square of complex-valued x, ||x||^2. | |
double | rem (double x, double y) |
The reminder of the division x/y. | |
double | sign (double x) |
The sign of x. | |
double | sgn (double x) |
The sign of x. | |
signed char | abs (signed char x) |
Absolute value. | |
short | abs (short x) |
Absolute value. | |
int | abs (int x) |
Absolute value. | |
double | round_to_zero (double x, double threshold=1e-14) |
Round x to zero if abs(x) is smaller than threshold. | |
Variables | |
int | signgam |
const double | pi = 3.14159265358979323846 |
Constant pi. | |
const double | m_2pi = 2 * pi |
Constant 2*Pi. | |
const double | eps = std::numeric_limits<double>::epsilon() |
Constant eps. | |
const double | log_double_max = std::log(std::numeric_limits<double>::max()) |
Constant definition to speed up trunc_log and trunc_exp functions. | |
const double | log_double_min = std::log(std::numeric_limits<double>::min()) |
Constant definition to speed up trunc_log and trunc_exp functions. |
-------------------------------------------------------------------------
IT++ - C++ library of mathematical, signal processing, speech processing, and communications classes and functions
Copyright (C) 1995-2007 (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.
You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-------------------------------------------------------------------------
Definition in file scalfunc.h.
|
Truncated natural logarithm function. This truncated function provides a solution in the cases when the logarithm argument is less or equal to zero or infinity. The function checks for such extreme values and use some kind of truncation (saturation) before calculating the logarithm. The truncated logarithm function can be used for calculation of log-likelihood in soft demodulators, when numerical instability problem might occur. Definition at line 140 of file scalfunc.h. |
|
Truncated exponential function. This truncated function provides a solution in the case when the exponent function results in infinity. The function checks for an extreme value and use truncation (saturation) before calculating the result. The truncated exponential function can be used when numerical instability problem occurs for a standard exp function. Definition at line 162 of file scalfunc.h. |
|
Constant pi.
Definition at line 115 of file scalfunc.h. |
|
Constant 2*Pi.
Definition at line 118 of file scalfunc.h. |
|
Constant eps.
Definition at line 121 of file scalfunc.h. |
|
Constant definition to speed up trunc_log and trunc_exp functions.
Definition at line 124 of file scalfunc.h. |
|
Constant definition to speed up trunc_log and trunc_exp functions.
Definition at line 126 of file scalfunc.h. |
Generated on Fri Jan 11 08:51:39 2008 for IT++ by Doxygen 1.3.9.1