Revision
22885 -
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Modified
Fri Mar 28 13:57:25 2008 UTC (6 years, 9 months ago) by
rdm
File length: 4863 byte(s)
Diff to
previous 20882
move the following directories under the new "math" meta directory:
mathcore
mathmore
fftw
foam
fumili
genvector
matrix
minuit
minuit2
mlp
physics
smatrix
splot
unuran
quadp
Revision
20154 -
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Modified
Mon Oct 1 14:20:05 2007 UTC (7 years, 3 months ago) by
brun
Original Path:
trunk/fftw/inc/TFFTComplex.h
File length: 4863 byte(s)
Diff to
previous 19826
Extend the functionality of Double32_t as explained below:
// The range specifier has the general format: [xmin,xmax] or [xmin,xmax,nbits]
// [0,1]
// [-10,100];
// [-pi,pi], [-pi/2,pi/4],[-2pi,2*pi]
// [-10,100,16]
// [0,0,8]
// if nbits is not specified, or nbits <2 or nbits>32 it is set to 32
// if (xmin==0 and xmax==0 and nbits <=16) the double word will be converted
// to a float and its mantissa truncated to nbits significative bits.
//
// IMPORTANT NOTE
// --------------
// Lets assume an original variable double x:
// When using the format [0,0,8] (ie range not specified) you get the best
// relative precision when storing and reading back the truncated x, say xt.
// The variance of (x-xt)/x will be better than when specifying a range
// for the same number of bits. However the precision relative to the
// range (x-xt)/(xmax-xmin) will be worst, and vice-versa.
// The format [0,0,8] is also interesting when the range of x is infinite
// or unknown.
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