name:
src/main/java/io/protobase/f7/formulas/math/ACOTH.java
-rw-r--r--
1142
1package io.protobase.f7.formulas.math;
2
3import io.protobase.f7.errors.NumException;
4import io.protobase.f7.formulas.AbstractFormula;
5import io.protobase.f7.formulas.FormulaName;
6import io.protobase.f7.models.GridColumnRowKey;
7import io.protobase.f7.utils.Converters;
8
9import java.util.function.BiFunction;
10import java.util.function.Function;
11
12public class ACOTH extends AbstractFormula {
13 public static FormulaName NAME = FormulaName.ACOTH;
14 public static ACOTH SELF = new ACOTH();
15
16 public ACOTH() {
17 super();
18 }
19
20 public ACOTH(Function<Object, Object> lookup, BiFunction<GridColumnRowKey, Object, Object> collateralLookup) {
21 super(lookup, collateralLookup);
22 }
23
24 @Override
25 public Object internal(GridColumnRowKey origin, Object... values) {
26 checkLength(values.length, 1, NAME);
27 double value = Converters.toDouble(Converters.first(collateralLookup.apply(origin, values[0])));
28 if (value <= 1 && value >= -1) {
29 throw new NumException(String.format("ACOTH parameter 1 value is %f. Valid values cannot be between -1 and 1 inclusive.", values));
30 }
31 return 0.5 * Math.log((value + 1) / (value - 1));
32 }
33}