mirror of
https://github.com/jkriege2/JKQtPlotter.git
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86 lines
2.2 KiB
C++
86 lines
2.2 KiB
C++
/*
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Copyright (c) 2008-2020 Jan W. Krieger (<jan@jkrieger.de>)
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last modification: $LastChangedDate$ (revision $Rev$)
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This software is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License (LGPL) as published by
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the Free Software Foundation, either version 2.1 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License (LGPL) for more details.
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You should have received a copy of the GNU Lesser General Public License (LGPL)
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "jkqtpstatkde.h"
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double jkqtpstatKernel1DGaussian(double t) {
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return exp(-0.5*t*t)/JKQTPSTATISTICS_SQRT_2PI;
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}
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double jkqtpstatKernel1DCauchy(double t) {
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return 1.0/(JKQTPSTATISTICS_PI*(1.0+t*t));
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}
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double jkqtpstatKernel1DPicard(double t) {
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return exp(-0.5*fabs(t))/2.0;
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}
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double jkqtpstatKernel1DEpanechnikov(double t) {
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return (fabs(t)<1.0)?(0.75*(1.0-t*t)):0.0;
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}
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double jkqtpstatKernel1DUniform(double t) {
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return (fabs(t)<=1.0)?0.5:0.0;
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}
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double jkqtpstatKernel1DTriangle(double t) {
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return (fabs(t)<=1.0)?(1.0-fabs(t)):0.0;
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}
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double jkqtpstatKernel1DQuartic(double t) {
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return (fabs(t)<=1.0)?(15.0/16.0*jkqtp_sqr(1.0-t*t)):0.0;
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}
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double jkqtpstatKernel1DTriweight(double t) {
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return (fabs(t)<1.0)?(35.0/32.0*jkqtp_cube(1.0-t*t)):0.0;
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}
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double jkqtpstatKernel1DTricube(double t) {
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return (fabs(t)<1.0)?(70.0/81.0*jkqtp_cube(1.0-jkqtp_cube(fabs(t)))):0.0;
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}
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double jkqtpstatKernel1DCosine(double t) {
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return (fabs(t)<1.0)?(JKQTPSTATISTICS_PI/4.0*cos(t*JKQTPSTATISTICS_PI/2.0)):0.0;
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}
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double jkqtpstatKernel2DGaussian(double tx, double ty)
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{
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return exp(-0.5*(tx*tx+ty*ty))/(2.0*JKQTPSTATISTICS_PI);
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}
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double jkqtpstatKernel2DUniform(double tx, double ty) {
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return (fabs(tx)<1.0 && fabs(ty)<=1.0)?0.25:0.0;
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}
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