Miscellaneous

Classes
class	gr::feval_dd
	base class for evaluating a function: double -> doubleThis class is designed to be subclassed in Python or C++ and is callable from both places. It uses SWIG's "director" feature to implement the magic. More...
class	gr::feval_cc
	base class for evaluating a function: complex -> complexThis class is designed to be subclassed in Python or C++ and is callable from both places. It uses SWIG's "director" feature to implement the magic. More...
class	gr::feval_ll
	base class for evaluating a function: long -> longThis class is designed to be subclassed in Python or C++ and is callable from both places. It uses SWIG's "director" feature to implement the magic. More...
class	gr::feval
	base class for evaluating a function: void -> voidThis class is designed to be subclassed in Python or C++ and is callable from both places. It uses SWIG's "director" feature to implement the magic. More...
class	gr::feval_p
	base class for evaluating a function: pmt -> voidThis class is designed to be subclassed in Python or C++ and is callable from both places. It uses SWIG's "director" feature to implement the magic. More...
class	gr::fxpt
	fixed point sine and cosine and friends.fixed pt radians -2**31 -pi 0 0 2**31-1 pi - epsilon More...
class	gr::fxpt_nco
	Numerically Controlled Oscillator (NCO) More...
class	gr::fxpt_vco
	Voltage Controlled Oscillator (VCO) More...
class	gr::message
	Message class. More...
class	gr::msg_queue
	thread-safe message queue More...
class	gr::nco< o_type, i_type >
	base class template for Numerically Controlled Oscillator (NCO) More...
class	gr::prefs
	Base class for representing user preferences a la windows INI files.The real implementation is in Python, and is accessible from C++ via the magic of SWIG directors. More...
class	gr::blocks::lfsr_15_1_0
	Linear Feedback Shift Register using primitive polynomial x^15 + x + 1. More...
class	gr::blocks::lfsr_32k
	generate pseudo-random sequence of length 32768 bits. More...
class	gr::digital::lfsr
	Fibonacci Linear Feedback Shift Register using specified polynomial mask. More...
class	gr::fft::fft_complex
	FFT: complex in, complex out. More...
class	gr::fft::fft_real_fwd
	FFT: real in, complex out. More...
class	gr::fft::fft_real_rev
	FFT: complex in, float out. More...
class	gr::fft::goertzel
	Implements Goertzel single-bin DFT calculation. More...
class	gr::wavelet::squash_ff
	Implements cheap resampling of spectrum directly from spectral points, using gsl interpolation. More...

Functions
GR_RUNTIME_API float	gr::fast_atan2f (float y, float x)
	Fast arc tangent using table lookup and linear interpolation. More...
GR_RUNTIME_API rt_status_t	gr::enable_realtime_scheduling ()
	If possible, enable high-priority "real time" scheduling. More...
GR_RUNTIME_API rt_status_t	gr::impl::enable_realtime_scheduling (rt_sched_param=rt_sched_param())
	If possible, enable "realtime" scheduling.In general, this means that the code will be scheduled before any non-realtime (normal) processes. Note that if your code contains an non-blocking infinite loop and you enable realtime scheduling, it's possible to hang the system. More...

Detailed Description

Function Documentation

enable_realtime_scheduling() [1/2]

GR_RUNTIME_API rt_status_t gr::enable_realtime_scheduling

(

)

If possible, enable high-priority "real time" scheduling.

enable_realtime_scheduling() [2/2]

GR_RUNTIME_API rt_status_t gr::impl::enable_realtime_scheduling

(

rt_sched_param

= rt_sched_param()

)

If possible, enable "realtime" scheduling.In general, this means that the code will be scheduled before any non-realtime (normal) processes. Note that if your code contains an non-blocking infinite loop and you enable realtime scheduling, it's possible to hang the system.

Referenced by gr::impl::rt_sched_param::rt_sched_param().

fast_atan2f()

GR_RUNTIME_API float gr::fast_atan2f	(	float	y,
		float	x
	)

Fast arc tangent using table lookup and linear interpolation.

Parameters

y	component of input vector
x	component of input vector

Returns

float angle angle of vector (x, y) in radians

This function calculates the angle of the vector (x,y) based on a table lookup and linear interpolation. The table uses a 256 point table covering -45 to +45 degrees and uses symmetry to determine the final angle value in the range of -180 to 180 degrees. Note that this function uses the small angle approximation for values close to zero. This routine calculates the arc tangent with an average error of +/- 0.045 degrees.

Referenced by gr::fast_atan2f(), and gr::is_power_of_2().