NAME

get_target_lut - Gets target lut for "building block" routines

SYNOPSIS

#include "m/m_lut.h"

Example compile flags (system dependent):
  -DLINUX_X86_64 -DLINUX_X86_64_OPTERON  -DGNU_COMPILER 
   -I/home/kobus/include
   -L/home/kobus/misc/load/linux_x86_64_opteron -L/usr/lib/x86_64-linux-gnu
  -lKJB                               -lfftw3  -lgsl -lgslcblas -ljpeg  -lSVM -lstdc++                    -lpthread -lSLATEC -lg2c    -lacml -lacml_mv -lblas -lg2c      -lncursesw 


int get_target_lut
(
	Lut **out_lp_ptr,
	int lut_len,
	double offset,
	double step
);

DESCRIPTION

This routine implements the creation/over-writing symantics used in the KJB library. If *target_lp_ptr is NULL, then this routine creates the lut. If it is not null, and it is the right size, then this routine does nothing. If it is the wrong size, then it is resized. If an actual resize is needed, then a new lut of the required size is first created. If the creation is successful, then the old lut is free'd. The reason is that if the new allocation fails, a calling application should have use of the old lut. The alternate is to free the old lut first. This is more memory efficient. A more sophisticated alternative is to free the old lut if it can be deterimined that the subsequent allocation will succeed. Although such approaches have merit, it is expected that resizing will occur infrequently enought that it is not worth implementing them. Thus the simplest method with good symantics under most conditions has been used.

RETURNS

On success, NO_ERROR is returned. On failure, ERROR is returned, with an error message being set.

Lut

DISCLAIMER

This software is not adequatedly tested. It is recomended that results are checked independantly where appropriate.

AUTHOR

Kobus Barnard

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