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Modify exp to use the non-alternating series and take a reciprocal in the case of a negative argument.

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This commit is contained in:
Arthur Drobot 2017-08-07 18:13:18 -07:00
parent ed92b382f0
commit 68fbcd2d7c
1 changed files with 3 additions and 8 deletions
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11
src/main/java/org/nwapw/abacus/plugin/StandardPlugin.java
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@ -303,14 +303,9 @@ public class StandardPlugin extends Plugin {
protected NumberInterface applyInternal(NumberInterface[] params) {
NumberInterface maxError = params[0].getMaxError();
int n = 0;
if (params[0].signum() <= 0) {
NumberInterface currentTerm = NaiveNumber.ONE.promoteTo(params[0].getClass()), sum = currentTerm;
while (FUNCTION_ABS.apply(currentTerm).compareTo(maxError) > 0) {
n++;
currentTerm = currentTerm.multiply(params[0]).divide((new NaiveNumber(n)).promoteTo(params[0].getClass()));
sum = sum.add(currentTerm);
}
return sum;
if (params[0].signum() < 0) {
NumberInterface[] negatedParams = {params[0].negate()};
return fromInt(params[0].getClass(), 1).divide(applyInternal(negatedParams));
} else {
//We need n such that x^(n+1) * 3^ceil(x) <= maxError * (n+1)!.
//right and left refer to lhs and rhs in the above inequality.