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/*
* Copyright (c) 2009 Samit Basu
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include "Stats.hpp"
#include "ArrayPrivate.hpp"
#include "Complex.hpp"
QVariant ComplexVariant(double real, double imag) {
if (imag == 0)
return QVariant(real);
if (imag > 0)
return QVariant(QString("%1+%2i").arg(real).arg(imag));
else
return QVariant(QString("%1%2i").arg(real).arg(imag));
}
template <typename T>
static QList<QVariant> TComputeVariableStatsReal(const BasicArray<T> &dp) {
QVariant vmin, vmax, vrange, vmean, vstd, vvar;
T dmin, dmax;
double dmean;
bool init = false;
index_t len = dp.length();
double norm = 1.0/len;
for (index_t i=1;i<=len;i++) {
T val = dp[i];
if (!IsNaN(val)) {
if (!init) {
init = true;
dmin = val;
dmax = val;
dmean = val*norm;
} else {
if (val < dmin) dmin = val;
if (val > dmax) dmax = val;
dmean += val*norm;
}
}
}
if (init) {
vmin = QVariant(dmin);
vmax = QVariant(dmax);
vrange = QVariant(dmax - dmin);
vmean = QVariant(dmean);
}
if (init && (len > 1)) {
double vnorm = 1.0/(len-1.0);
double dvar = 0;
for (index_t i=1;i<=len;i++) {
T val = dp[i] - dmean;
dvar += val*val*vnorm;
}
vvar = QVariant(dvar);
vstd = QVariant(sqrt(dvar));
}
return QList<QVariant>() << vmin << vmax << vrange << vmean << vstd << vvar;
}
template <typename T>
static QList<QVariant> TComputeVariableStatsComplex(const BasicArray<T> &dp_real,
const BasicArray<T> &dp_imag) {
QVariant vmin, vmax, vrange, vmean, vstd, vvar;
T dmin_real = 0, dmax_real = 0; double dmean_real = 0;
T dmin_imag = 0, dmax_imag = 0; double dmean_imag = 0;
index_t len = dp_real.length();
bool init = false;
double norm = 1.0/len;
for (index_t i=1;i<=len;i++) {
T val_real = dp_real[i];
T val_imag = dp_imag[i];
if (!IsNaN(val_real) && !IsNaN(val_imag)) {
if (!init) {
init = true;
dmin_real = val_real; dmin_imag = val_imag;
dmax_real = val_real; dmax_imag = val_imag;
dmean_real = val_real*norm; dmean_imag = val_imag*norm;
} else {
if (complex_lt(val_real,val_imag,dmin_real,dmin_imag)) {
dmin_real = val_real;
dmin_imag = val_imag;
}
if (complex_gt(val_real,val_imag,dmax_real,dmax_imag)) {
dmax_real = val_real;
dmax_imag = val_imag;
}
dmean_real += val_real*norm; dmean_imag += val_imag*norm;
}
}
}
if (init) {
vmin = ComplexVariant(dmin_real,dmin_imag);
vmax = ComplexVariant(dmax_real,dmax_imag);
vrange = ComplexVariant(dmax_real - dmin_real,dmax_imag - dmin_imag);
vmean = ComplexVariant(dmean_real,dmean_imag);
}
if (init && (len > 1)) {
double vnorm = 1.0/(len-1.0);
double dvar = 0;
for (index_t i=1;i<=len;i++) {
T val_real = dp_real[i] - dmean_real;
T val_imag = dp_imag[i] - dmean_imag;
dvar += complex_abs(val_real,val_imag)*vnorm;
}
vvar = QVariant(dvar);
vstd = QVariant(sqrt(dvar));
}
return QList<QVariant>() << vmin << vmax << vrange << vmean << vstd << vvar;
}
template <typename T>
static QList<QVariant> TComputeVariableStats(const Array *x) {
if (x->allReal()) {
return TComputeVariableStatsReal<T>(x->constReal<T>());
} else {
return TComputeVariableStatsComplex<T>(x->constReal<T>(),
x->constImag<T>());
}
}
#define MacroTCompute(ctype,cls) \
case cls: return TComputeVariableStats<ctype>(x);
QList<QVariant> ComputeVariableStats(const Array *x) {
QList<QVariant> empty;
empty << QVariant() << QVariant() << QVariant() << QVariant() << QVariant() << QVariant();
if (x->isSparse() || x->isString() ||
x->isReferenceType() || x->isUserClass() ||
x->isEmpty() || x->length() > 5000 || x->isScalar()) {
return empty;
} else {
switch (x->dataClass()) {
default:
return empty;
MacroExpandCasesNoBool(MacroTCompute);
}
}
}
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