... (11.1 .3) . Specifically, we first choose P 23 to annihilate a 31 (and, by symmetry, a 13 ). Then we choose P24to annihilate a41. In general, wechoose the sequenceP 23 , P24, ,P2n;P 34 , ,P3n; ... the limit of large n, the operation count of the Householder reductionis 2n 3 /3 for eigenvalues only, and 4n 3 /3 for both eigenvalues and eigenvectors.#include <math.h>void tred2(float ... 000...(n−1)P10·a11a12a 13 ··· a1na21a 31 ...irrelevantan1=a11a12a 13 ··· a1nk0...irrelevant0(11.2.7)Here...