To calculate the internal rate of return for a schedule of cash flows that is not necessarily periodic.

• If you are using Gradle just add the following dependency to your build.gradle.

implementation "com.github.joutvhu:xirr:1.0.5"

• Or add the following dependency to your pom.xml if you are using Maven.

<dependency>
    <groupId>com.github.joutvhu</groupId>
    <artifactId>xirr</artifactId>
    <version>1.0.5</version>
</dependency>

To use the xirr function you need to create a Xirr object.

You can use the Xirr.instance() method to create a Xirr object. Xirr cycles through the calculation until the result is accurate within 0.000001 percent. If Xirr can't find a result that works after 100 tries, you'll get a XirrException.

You can also change the accuracy and tries using the Xirr.of(double accurate, double tries) method.

// Xirr.instance() -> precision = 0.000001, tries = 100;
Xirr xirr = Xirr.instance();

// Xirr.of(double precision, double tries);
Xirr xirr1 = Xirr.of(0.000001, 1000);

The Syntax of the xirr function:

• Xirr.xirr(Transaction[] transactions)

• Xirr.xirr(Transaction[] transactions, double guess)

• Xirr.xirr(double[] values, long[] days)

• Xirr.xirr(double[] values, long[] days, double guess)

The arguments of the xirr function:

• values required. A series of cash flows that corresponds to a schedule of payments in dates. The first payment is optional and corresponds to a cost or payment that occurs at the beginning of the investment. If the first value is a cost or payment, it must be a negative value. All succeeding payments are discounted based on a 365-day year. The series of values must contain at least one positive and one negative value.
• days required. A schedule of payment dates that corresponds to the cash flow payments. Dates may occur in any order.
• transactions required. A series of pairs of value and day.
• guess optional. A number that you guess is close to the result of Xirr. If omitted, guess is assumed to be 0.1 (10 percent).

// rate ~ 0.35899244 ~ 35.90%
double rate = Xirr.instance().xirr(
        new Transaction(-10000,"2008-01-01"),
        new Transaction(2750,"2008-03-01"),
        new Transaction(4250,"2008-11-30"),
        new Transaction(3250,"2009-02-15"),
        new Transaction(2750,"2009-04-01")
);