org.apache.poi.ss.formula.atp.PercentRankExcFunction Maven / Gradle / Ivy
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contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
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(the "License"); you may not use this file except in compliance with
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http://www.apache.org/licenses/LICENSE-2.0
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See the License for the specific language governing permissions and
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package org.apache.poi.ss.formula.atp;
import org.apache.poi.ss.formula.OperationEvaluationContext;
import org.apache.poi.ss.formula.eval.*;
import org.apache.poi.ss.formula.functions.FreeRefFunction;
import org.apache.poi.ss.formula.functions.PercentRank;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.List;
/**
* Implementation of 'Analysis Toolpak' the Excel function PERCENTRANK.EXC()
*
* Syntax:
* PERCENTRANK.EXC(array, X, [significance])
*
* array The array or range of data with numeric values that defines relative standing.
* X The value for which you want to know the rank.
* significance Optional. A value that identifies the number of significant digits for the returned percentage value.
* If omitted, PERCENTRANK.EXC uses three digits (0.xxx).
*
* Returns a number between 0 and 1 (exclusive) representing a percentage. PERCENTRANK.INC returns value between 0 and 1 (inclusive).
*
* @see PercentRank
* @see PercentRankIncFunction
* @since POI 5.1.0
*/
final class PercentRankExcFunction implements FreeRefFunction {
public static final FreeRefFunction instance = new PercentRankExcFunction(ArgumentsEvaluator.instance);
private ArgumentsEvaluator evaluator;
private PercentRankExcFunction(ArgumentsEvaluator anEvaluator) {
// enforces singleton
this.evaluator = anEvaluator;
}
public ValueEval evaluate(ValueEval[] args, OperationEvaluationContext ec) {
return evaluate(args, ec.getRowIndex(), ec.getColumnIndex());
}
private ValueEval evaluate(ValueEval[] args, int srcRowIndex, int srcColumnIndex) {
if (args.length < 2) {
return ErrorEval.VALUE_INVALID;
}
double x;
try {
ValueEval ev = OperandResolver.getSingleValue(args[1], srcRowIndex, srcColumnIndex);
x = OperandResolver.coerceValueToDouble(ev);
} catch (EvaluationException e) {
ValueEval error = e.getErrorEval();
if (error == ErrorEval.NUM_ERROR) {
return error;
}
return ErrorEval.NUM_ERROR;
}
ArrayList numbers = new ArrayList<>();
try {
List values = PercentRank.getValues(args[0], srcRowIndex, srcColumnIndex);
for (ValueEval ev : values) {
if (ev instanceof BlankEval || ev instanceof MissingArgEval) {
//skip
} else {
numbers.add(OperandResolver.coerceValueToDouble(ev));
}
}
} catch (EvaluationException e) {
ValueEval error = e.getErrorEval();
if (error != ErrorEval.NA) {
return error;
}
return ErrorEval.NUM_ERROR;
}
if (numbers.isEmpty()) {
return ErrorEval.NUM_ERROR;
}
int significance = 3;
if (args.length > 2) {
try {
ValueEval ev = OperandResolver.getSingleValue(args[2], srcRowIndex, srcColumnIndex);
significance = OperandResolver.coerceValueToInt(ev);
if (significance < 1) {
return ErrorEval.NUM_ERROR;
}
} catch (EvaluationException e) {
return e.getErrorEval();
}
}
return calculateRank(numbers, x, significance, true);
}
private ValueEval calculateRank(List numbers, double x, int significance, boolean recurse) {
double closestMatchBelow = Double.MIN_VALUE;
double closestMatchAbove = Double.MAX_VALUE;
double min = Double.MAX_VALUE;
double max = Double.MIN_VALUE;
if (recurse) {
for (Double d : numbers) {
if (d <= x && d > closestMatchBelow) closestMatchBelow = d;
if (d > x && d < closestMatchAbove) closestMatchAbove = d;
if (d < min) min = d;
if (d > max) max = d;
}
if (x < min || x > max) {
return ErrorEval.NA;
}
}
if (!recurse || closestMatchBelow == x || closestMatchAbove == x) {
int lessThanCount = 0;
for (Double d : numbers) {
if (d < x) lessThanCount++;
}
BigDecimal result = BigDecimal.valueOf((double)(lessThanCount + 1) / (double)(numbers.size() + 1));
return new NumberEval(PercentRank.round(result, significance));
} else {
int intermediateSignificance = significance < 5 ? 8 : significance + 3;
ValueEval belowRank = calculateRank(numbers, closestMatchBelow, intermediateSignificance, false);
if (!(belowRank instanceof NumberEval)) {
return belowRank;
}
ValueEval aboveRank = calculateRank(numbers, closestMatchAbove, intermediateSignificance, false);
if (!(aboveRank instanceof NumberEval)) {
return aboveRank;
}
return PercentRank.interpolate(x, closestMatchBelow, closestMatchAbove,
(NumberEval)belowRank, (NumberEval)aboveRank, significance);
}
}
}