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Add a random function.

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This commit is contained in:
Danila Fedorin 2017-08-09 11:51:12 -07:00
parent 61475a24d9
commit d6f4838f05
1 changed files with 22 additions and 0 deletions
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22
src/main/java/org/nwapw/abacus/plugin/StandardPlugin.java
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@ -242,6 +242,20 @@ public class StandardPlugin extends Plugin {
return OP_CARET.getFunction().apply(params[0], ((new NaiveNumber(0.5)).promoteTo(params[0].getClass())));
}
};
/**
* Gets a random number smaller or equal to the given number's integer value.
*/
public static final Function FUNCTION_RAND_INT = new Function() {
@Override
protected boolean matchesParams(NumberInterface[] params) {
return params.length == 1;
}
@Override
protected NumberInterface applyInternal(NumberInterface[] params) {
return fromInt(params[0].getClass(), (int) Math.round(Math.random() * params[0].floor().intValue()));
}
};
/**
* The implementation for double-based naive numbers.
*/
@ -572,6 +586,8 @@ public class StandardPlugin extends Plugin {
registerFunction("csc", functionCsc);
registerFunction("cot", functionCot);
registerFunction("random_int", FUNCTION_RAND_INT);
registerDocumentation(new Documentation("abs", "Absolute Value", "Finds the distance " +
"from zero of a number.", "Given a number, this function finds the distance form " +
"zero of a number, effectively turning negative numbers into positive ones.\n\n" +
@ -600,6 +616,12 @@ public class StandardPlugin extends Plugin {
"in radians.", "", DocumentationType.FUNCTION));
registerDocumentation(new Documentation("cot", "Cotangent", "Computes the cotangent of the given angle, " +
"in radians.", "", DocumentationType.FUNCTION));
registerDocumentation(new Documentation("random_int", "Random Integer", "Generates a random integer [0, n].",
"Generates a pseudorandom number using the standard JVM random mechanism, keeping it less than or " +
"equal to the given number.\n\n" +
"Example: random_int(5) -> 4\n" +
"random_int(5) -> 3\n" +
"random_int(5) -> 3\n", DocumentationType.FUNCTION));
}
@Override