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[github-733] Fix rate order in Mirr function. Thanks to Aleksandrs Jansons. This closes #733 

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1922095 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
PJ Fanning 2024-11-25 20:48:45 +00:00
parent 0d63f9a814
commit edb9aeaca5
3 changed files with 29 additions and 35 deletions
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25
poi/src/main/java/org/apache/poi/ss/formula/functions/Mirr.java
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@ -56,23 +56,20 @@ public class Mirr extends MultiOperandNumericFunction {
@Override
protected double evaluate(double[] values) throws EvaluationException {
double financeRate = values[values.length-1];
double reinvestRate = values[values.length-2];
double financeRate = values[values.length-2];
double reinvestRate = values[values.length-1];
double[] mirrValues = Arrays.copyOf(values, values.length - 2);
boolean mirrValuesAreAllNegatives = true;
for (double mirrValue : mirrValues) {
mirrValuesAreAllNegatives &= mirrValue < 0;
}
if (mirrValuesAreAllNegatives) {
return -1.0d;
}
boolean mirrValuesAreAllPositives = true;
for (double mirrValue : mirrValues) {
mirrValuesAreAllNegatives &= mirrValue < 0;
mirrValuesAreAllPositives &= mirrValue > 0;
}
if (mirrValuesAreAllNegatives) {
return -1.0d;
}
if (mirrValuesAreAllPositives) {
throw new EvaluationException(ErrorEval.DIV_ZERO);
}
@ -87,15 +84,11 @@ public class Mirr extends MultiOperandNumericFunction {
double fv = 0;
int indexN = 0;
for (double anIn : in) {
if (anIn < 0) {
pv += anIn / Math.pow(1 + financeRate + reinvestRate, indexN++);
}
}
for (double anIn : in) {
if (anIn > 0) {
fv += anIn * Math.pow(1 + financeRate, numOfYears - indexN++);
fv += anIn * Math.pow(1 + reinvestRate, numOfYears - indexN++);
} else if (anIn < 0) {
pv += anIn / Math.pow(1 + financeRate, indexN++);
}
}

39
poi/src/test/java/org/apache/poi/ss/formula/functions/TestMirr.java
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@ -44,43 +44,44 @@ final class TestMirr {
Mirr mirr = new Mirr();
double mirrValue;
double financeRate = 0.12;
double reinvestRate = 0.1;
double[] values = {-120000d, 39000d, 30000d, 21000d, 37000d, 46000d, reinvestRate, financeRate};
// MIRR should not failed with these parameters
double financeRate = 0.1;
double reinvestRate = 0.12;
double[] values = {-120000d, 39000d, 30000d, 21000d, 37000d, 46000d, financeRate, reinvestRate};
mirrValue = mirr.evaluate(values);
assertEquals(0.126094130366, mirrValue, 0.0000000001);
reinvestRate = 0.05;
financeRate = 0.08;
values = new double[]{-7500d, 3000d, 5000d, 1200d, 4000d, reinvestRate, financeRate};
// MIRR should not failed with these parameters
financeRate = 0.05;
reinvestRate = 0.08;
values = new double[]{-7500d, 3000d, 5000d, 1200d, 4000d, financeRate, reinvestRate};
mirrValue = mirr.evaluate(values);
assertEquals(0.18736225093, mirrValue, 0.0000000001);
reinvestRate = 0.065;
financeRate = 0.1;
values = new double[]{-10000, 3400d, 6500d, 1000d, reinvestRate, financeRate};
// MIRR should not failed with these parameters
financeRate = 0.065;
reinvestRate = 0.1;
values = new double[]{-10000, 3400d, 6500d, 1000d, financeRate, reinvestRate};
mirrValue = mirr.evaluate(values);
assertEquals(0.07039493966, mirrValue, 0.0000000001);
reinvestRate = 0.07;
financeRate = 0.01;
values = new double[]{-10000d, -3400d, -6500d, -1000d, reinvestRate, financeRate};
// MIRR should not failed with these parameters
financeRate = 0.07;
reinvestRate = 0.01;
values = new double[]{-10000d, -3400d, -6500d, -1000d, financeRate, reinvestRate};
mirrValue = mirr.evaluate(values);
assertEquals(-1, mirrValue, 0.0);
financeRate = 0.1;
reinvestRate = 0.12;
values = new double[]{-1000d, -4000d, 5000d, 2000d, financeRate, reinvestRate};
mirrValue = mirr.evaluate(values);
assertEquals(0.179085686035, mirrValue, 0.0000000001);
}
@Test
void testMirrErrors_expectDIV0() {
Mirr mirr = new Mirr();
double reinvestRate = 0.05;
double financeRate = 0.08;
double[] incomes = {120000d, 39000d, 30000d, 21000d, 37000d, 46000d, reinvestRate, financeRate};
double reinvestRate = 0.05;
double[] incomes = {120000d, 39000d, 30000d, 21000d, 37000d, 46000d, financeRate, reinvestRate};
EvaluationException e = assertThrows(EvaluationException.class, () -> mirr.evaluate(incomes));
assertEquals(ErrorEval.DIV_ZERO, e.getErrorEval());
@ -117,7 +118,7 @@ final class TestMirr {
HSSFSheet sheet = wb.getSheet("Mirr");
HSSFFormulaEvaluator fe = new HSSFFormulaEvaluator(wb);
int failureCount = 0;
int[] resultRows = {9, 19, 29, 45};
int[] resultRows = {9, 19, 29, 45, 53};
for (int rowNum : resultRows) {
HSSFRow row = sheet.getRow(rowNum);

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test-data/spreadsheet/mirrTest.xls
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