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/***************************************************************************
ksutils.cpp - K Desktop Planetarium
-------------------
begin : Mon Jan 7 10:48:09 EST 2002
copyright : (C) 2002 by Mark Hollomon
email : mhh@mindspring.com
***************************************************************************/
/***************************************************************************
* *
* 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. *
* *
***************************************************************************/
#include <kstandarddirs.h>
#include <qfile.h>
#include "ksutils.h"
bool KSUtils::openDataFile( QFile &file, const QString &s ) {
bool result;
QString FileName = locate( "appdata", s );
if ( !FileName.isNull() ) {
file.setName( FileName );
if ( !file.open( IO_ReadOnly ) ) {
result = false;
} else {
result = true;
}
} else {
result = false;
}
return result;
}
long double KSUtils::lagrangeInterpolation( const long double x[], const long double v[], int n, long double xval) {
long double value = 0;
for (int i=1; i<n; ++i) {
long double c = 1.0;
for (int j = 1; j<n;++j)
if (i != j)
c *= (xval - x[j]) / (x[i] - x[j]);
value += c *v[i];
}
return value;
}
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