Как имененить размер двумерного динамического массива?

struct Graph
{
	Node *nodes;
	int numNodes;
	float **adj;
};

void insert(Graph *graph)
{
	graph->numNodes++;
	graph->adj = (float **)realloc(graph->adj, graph->numNodes * sizeof(float*));
	for (int i = 0; i < graph->numNodes - 1; i++)
		graph->adj[i] = (float *)realloc(graph->adj[i], graph->numNodes * sizeof(float));
	graph->adj[graph->numNodes - 1] = (float*)calloc(graph->numNodes, sizeof(float));
}

void D_printGraph(Graph *graph)
{
	for (int i = 0; i < graph->numNodes; i++)
	{
		for (int j = 0; j < graph->numNodes; j++)
			printf("%f\t", graph->adj[i][j]);
		printf("\n");
	}
}