commons-math-legacy/src/main/java/org/apache/commons/math4/legacy/linear/OpenIntToDoubleHashMap.java [348:378]:
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        final int hash  = hashOf(key);
        int index = hash & mask;
        if (containsKey(key, index)) {
            return doRemove(index);
        }

        if (states[index] == FREE) {
            return missingEntries;
        }

        int j = index;
        for (int perturb = perturb(hash); states[index] != FREE; perturb >>= PERTURB_SHIFT) {
            j = probe(perturb, j);
            index = j & mask;
            if (containsKey(key, index)) {
                return doRemove(index);
            }
        }

        return missingEntries;
    }

    /**
     * Check if the tables contain an element associated with specified key
     * at specified index.
     * @param key key to check
     * @param index index to check
     * @return true if an element is associated with key at index
     */
    private boolean containsKey(final int key, final int index) {
        return (key != 0 || states[index] == FULL) && keys[index] == key;
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commons-math-legacy/src/main/java/org/apache/commons/math4/legacy/linear/OpenIntToFieldHashMap.java [360:390]:
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        final int hash  = hashOf(key);
        int index = hash & mask;
        if (containsKey(key, index)) {
            return doRemove(index);
        }

        if (states[index] == FREE) {
            return missingEntries;
        }

        int j = index;
        for (int perturb = perturb(hash); states[index] != FREE; perturb >>= PERTURB_SHIFT) {
            j = probe(perturb, j);
            index = j & mask;
            if (containsKey(key, index)) {
                return doRemove(index);
            }
        }

        return missingEntries;
    }

    /**
     * Check if the tables contain an element associated with specified key
     * at specified index.
     * @param key key to check
     * @param index index to check
     * @return true if an element is associated with key at index
     */
    private boolean containsKey(final int key, final int index) {
        return (key != 0 || states[index] == FULL) && keys[index] == key;
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