double-double/node/double-double/unary/dd-mult-by-neg-2.js

Pure double-double precision functions *with strict error bounds*.

/**
 * Returns the result of multiplying the given double-double by -2.
 * * The result is exact
 * @param f a double-double precision floating point number
 */
function ddMultByNeg2(f) {
    return [-2 * f[0], -2 * f[1]];
}
export { ddMultByNeg2 };
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