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Add arcsin.

This commit is contained in:
Arthur Drobot 2017-08-09 12:47:43 -07:00
parent 1d6957c4d9
commit ca6d8d2ba2
1 changed files with 35 additions and 0 deletions
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35
src/main/java/org/nwapw/abacus/plugin/StandardPlugin.java
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@ -451,6 +451,40 @@ public class StandardPlugin extends Plugin {
}
};
/**
* The arcsin function (return type in radians).
* @param manager
*/
public final Function functionArcsin = new Function() {
@Override
protected boolean matchesParams(NumberInterface[] params) {
return params.length == 1
&& FUNCTION_ABS.apply(params[0]).compareTo(fromInt(params[0].getClass(), 1)) <= 0;
}
@Override
protected NumberInterface applyInternal(NumberInterface[] params) {
if(FUNCTION_ABS.apply(params[0]).compareTo(new NaiveNumber(0.8).promoteTo(params[0].getClass())) >= 0){
NumberInterface[] newParams = {FUNCTION_SQRT.apply(fromInt(params[0].getClass(), 1).subtract(params[0].multiply(params[0])))};
return piFor(params[0].getClass()).divide(fromInt(params[0].getClass(), 2))
.subtract(applyInternal(newParams)).multiply(fromInt(params[0].getClass(), params[0].signum()));
}
NumberInterface currentTerm = params[0], sum = currentTerm,
multiplier = currentTerm.multiply(currentTerm), summandBound = sum.getMaxError().multiply(fromInt(sum.getClass(), 1).subtract(multiplier)),
power = currentTerm, coefficient = fromInt(params[0].getClass(), 1);
int exponent = 1;
while(FUNCTION_ABS.apply(currentTerm).compareTo(summandBound) > 0){
exponent += 2;
power = power.multiply(multiplier);
coefficient = coefficient.multiply(fromInt(params[0].getClass(), exponent-2))
.divide(fromInt(params[0].getClass(), exponent - 1));
currentTerm = power.multiply(coefficient).divide(fromInt(power.getClass(), exponent));
sum = sum.add(currentTerm);
}
return sum;
}
};
public StandardPlugin(PluginManager manager) {
super(manager);
}
@ -568,6 +602,7 @@ public class StandardPlugin extends Plugin {
registerFunction("sec", functionSec);
registerFunction("csc", functionCsc);
registerFunction("cot", functionCot);
registerFunction("arcsin", functionArcsin);
}
@Override