Package org.boris.expr.function.excel

Source Code of org.boris.expr.function.excel.LOG

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package org.boris.expr.function.excel;

import org.boris.expr.Expr;
import org.boris.expr.ExprDouble;
import org.boris.expr.ExprError;
import org.boris.expr.ExprException;
import org.boris.expr.function.AbstractFunction;
import org.boris.expr.util.Maths;

public class LOG extends AbstractFunction
{
    public Expr evaluate(Expr[] args) throws ExprException {
        assertMinArgCount(args, 1);
        assertMaxArgCount(args, 2);
        double num = asDouble(args[0], true);
        if (num < 0)
            return ExprError.NUM;

        int base = 10;
        if (args.length == 2)
            base = asInteger(args[1], true);
        if (base < 1)
            return ExprError.NUM;
        if (base == 1)
            return ExprError.DIV0;

        return new ExprDouble(Maths.log(num, base));
    }
}
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Related Classes of org.boris.expr.function.excel.LOG

  • org.boris.expr.ExcelMathAndTrigFunctionsTest
  • org.boris.expr.ExprDouble
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