org.lsmp.djep.vectorJep.function.VRange Maven / Gradle / Ivy
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JEP is a Java library for parsing and evaluating mathematical expressions.
/*****************************************************************************
JEP 2.4.1, Extensions 1.1.1
April 30 2007
(c) Copyright 2007, Nathan Funk and Richard Morris
See LICENSE-*.txt for license information.
*****************************************************************************/
package org.lsmp.djep.vectorJep.function;
import org.nfunk.jep.*;
import org.lsmp.djep.vectorJep.Dimensions;
import org.lsmp.djep.vectorJep.values.*;
/**
* A enhanced version of List, allows matrices and tensors.
* During evaluation this function converts lists of values into the appropriate
* @see org.lsmp.djep.vectorJep.values.MatrixValueI MatrixValueI
* type.
*
* @author Rich Morris
* Created on 27-Nov-2003
*/
public class VRange extends org.nfunk.jep.function.Range
implements NaryOperatorI
{
public VRange()
{
numberOfParameters = -1;
}
/** Calculates the dimension of this node with given dimensions of children. */
public Dimensions calcDim(Dimensions dims[]) throws ParseException
{
return Dimensions.UNKNOWN;
}
/** Calculates the value of this node.
*
*/
public MatrixValueI calcValue(MatrixValueI res,
MatrixValueI inputs[]) throws ParseException
{
Object out;
if(inputs.length == 2)
{
Object lastObj = inputs[1];
Object firstObj = inputs[0];
double last = ((Number) lastObj).doubleValue();
double first = ((Number) firstObj).doubleValue();
double diff = last-first;
int steps = 1+(int) diff;
out=genRange(first,1.0,steps);
}
else if(inputs.length == 3)
{
Object incObj = inputs[2];
Object lastObj = inputs[1];
Object firstObj = inputs[0];
double inc = ((Number) incObj).doubleValue();
double last = ((Number) lastObj).doubleValue();
double first = ((Number) firstObj).doubleValue();
double diff = (last-first)/inc;
int steps = 1+(int) diff;
out=genRange(first,inc,steps);
}
else if(inputs.length == 4)
{
Object stepsObj = inputs[4];
//Object incObj = inputs[3];
Object lastObj = inputs[2];
Object firstObj = inputs[0];
int steps = ((Number) stepsObj).intValue();
double last = ((Number) lastObj).doubleValue();
double first = ((Number) firstObj).doubleValue();
double inc = (last-first)/(steps-1);
out=genRange(first,inc,steps);
}
else throw new ParseException("Range:only a maximum of four arguments can be specified");
throw new ParseException("VRange: calcValue not implemented");
}
public Object genRange(double low, double inc, int steps) {
MVector res = new MVector(steps);
for(int i=0;i