quaeratin/node/double-expansion/e-compare.js

An extended precision floating point library (as per Shewchuk) - precision only limited by overflow / underflow

import { eDiff } from "./e-diff.js";
import { eSign } from "./e-sign.js";
/**
 * Returns 0 if a === b, a +tive value if a > b or a negative value if a < b.
 *
 * * see [Shewchuk](https://people.eecs.berkeley.edu/~jrs/papers/robustr.pdf)
 *
 * "The easiest way to compare two expansions is to subtract one from the other,
 * and test the sign of the result. An expansion’s sign can be easily tested
 * because of the nonoverlapping property; simply check the sign of the
 * expansion's most significant nonzero component..."
 *
 * @param a a floating point expansion
 * @param b another floating point expansion
 */
function eCompare(a, b) {
    return eSign(eDiff(a, b));
}
export { eCompare };
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