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Add absolute value function to standard plugin. Modify getNTermsExp to work on negative exponents instead (and correctly).

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This commit is contained in:
Arthur Drobot 2017-07-27 10:03:26 -07:00
parent 367abb4157
commit e04caee942
1 changed files with 17 additions and 3 deletions
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20
src/org/nwapw/abacus/plugin/StandardPlugin.java
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@ -75,6 +75,7 @@ public class StandardPlugin extends Plugin {
});
registerFunction("!", new Function() {
//private ArrayLi
@Override
protected boolean matchesParams(NumberInterface[] params) {
return params.length == 1;
@ -95,6 +96,18 @@ public class StandardPlugin extends Plugin {
}
});
registerFunction("abs", new Function() {
@Override
protected boolean matchesParams(NumberInterface[] params) {
return params.length == 1;
}
@Override
protected NumberInterface applyInternal(NumberInterface[] params) {
return params[0].multiply((new NaiveNumber(params[0].signum())).promoteTo(params[0].getClass()));
}
});
registerFunction("exp", new Function() {
@Override
protected boolean matchesParams(NumberInterface[] params) {
@ -126,14 +139,15 @@ public class StandardPlugin extends Plugin {
* @return
*/
private int getNTermsExp(NumberInterface maxError, NumberInterface x){
//We need n such that x^(n+2) <= (n+1)! * maxError
//We need n such that |x^(n+1)| <= (n+1)! * maxError
//The variables LHS and RHS refer to the above inequality.
int n = 0;
NumberInterface LHS = x.intPow(2), RHS = maxError;
x = this.getFunction("abs").apply(x);
NumberInterface LHS = x, RHS = maxError;
while(LHS.compareTo(RHS) > 0){
n++;
LHS = LHS.multiply(x);
RHS = RHS.multiply(new NaiveNumber(n).promoteTo(RHS.getClass()));
RHS = RHS.multiply(new NaiveNumber(n+1).promoteTo(RHS.getClass()));
}
return n;
}