In programming a node is a pointer to some data. For instance, if we allocate objects non-contiguously we can treat them as if they were allocated contiguously by storing pointers to those objects in a contiguous array:
foo* a[100];
for (int i=0; i<100; ++i) a[i] = malloc (sizeof(foo));
In the above example we have an array of foo nodes. The foo objects themselves are individually allocated on the heap but they need not be allocated contiguously. But this does not matter because an array is always allocated contiguously so the order of the objects is determined by the order of the nodes in the array. If we change the order of the nodes, we change the order of the objects, but the objects don't actually move. This is useful when the objects are large or complex because it means we can change their order much more efficiently just by moving the nodes.
As well as pointers, a node can also be defined as a structure:
struct node {
foo* data;
node* next;
};
Here, the node still points to an object but also points to another node, the next node in the sequence. In this case we don't need an array, we simply need to keep track of the first node in the sequence. This means we are no longer restricted by the array length; we can have as many or as few nodes as we require. Changing the order of the nodes is simply a matter of changing which data element each node points to. We can also insert and extract elements from the sequence by changing which node each node points to.
More complex data structures require additional node pointers. For instance, a bi-directional list requires two node pointers, one to the next element in the sequence and one to the previous element:
struct node { foo* data;
node* next;
node* prev;
};
A binary tree node also has two node pointers:
struct node {
foo* data;
node* left;
node* right;
};
A binary tree node might also point to its parent node:
struct node {
foo* data;
node* parent;
node* left;
node* right;
};
A tertiary node has at least three node pointers:
struct node {
foo* data;
node* left;
node* middle;
node* right;
};
Nodes make it possible to construct highly-complex data structures regardless of where the data is physically allocated and the order in which it is allocated. The point is that we don't need to move any data around because the nodes themselves define the data structure. The nodes can be thought of as being metadata (data about data).
Any node that allows traversal to any other node in the structure can be used to keep track of the structure, however we typically use the node that provides the most efficient traversal. In a tree structure, that is always the root node. In a list, it is the head node.
The number of even nodes in any list is always half size of the list rounded down to the nearest integer. To round down you simply take the integral portion of the division. E.g., for a list of 5 nodes, nodes 2 and 4 are the even nodes, therefore there are only 2 even nodes. Thus: 5 / 2 = 2.5 = 2. A list of 4 nodes also has 2 even nodes, thus 4 / 2 = 2.0 = 2.
distinct_nodes is a feature of XQuery, returning all the distinct nodes that match the criteria.
A binary tree with n nodes has exactly n+1 null nodes or Null Branches. so answer is 21. MOHAMMAD SAJID
int Nodes (Tree *t) { int sum= 0; if (t) { sum+=1; if (t->left) sum += Nodes (t->left); if (t->right) sum += Nodes (t->right); } return sum; }
Use the following formula: (2^n)-1. E.g., if the depth is 3, the number of nodes is (2^3)-1 = 8-1 = 7. Note that 7 is the maximum number of nodes, not the actual number of nodes. To count the actual nodes you must traverse the tree, updating an accumulator as you go.
Typically, the sentinel nodes are axillary nodes. If you are having the axillary nodes removed, the sentinal nodes will also be removed.
Anterior and posterior cervical lymph nodes.
"Nodes" is a noun.
The Mediastinal Nodes are lymph nodes located in the center of the chest. The Superior Mediastinal Nodes are adjacent to the Trachea and Esophagus. The Inferior Mediastinal Nodes lie between the lower lobes of the Lungs.
tiny vessels
The jugulodigastric lymph nodes are located in the neck close to the cervical nodes.
The total number of nodes in the electron cloud of an atom, including both angular nodes and radial nodes, is determined by the quantum numbers of the electron. The number of nodes can vary depending on the specific electron configuration of the atom.
150 nodes
The presence of buds at the nodes
3 nodes in 4f
The number of radial nodes and angular nodes in an atomic orbital determine its overall shape. Radial nodes affect the distance from the nucleus, while angular nodes influence the orientation of the orbital. More nodes lead to a more complex and intricate shape of the orbital.
Lymph Nodes