compute these into Matlab  and find out why and what are they doing(in your own words)

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а. Run the following commands, what do they do? triu (E) tril (E) b. What do the following do, try different numbers? triu (E, 1) tril (E, -1) c. From the lower triangular, upper triangular and diagonal you should be able to reconstruct the matrix triu (E, 1) + tril (E, -1) + diag (E) Does this reconstruct E? If not, what do you need to do to fix this? а. Run the following commands, what do they do? triu (E) tril (E) b. What do the following do, try different numbers? triu (E, 1) tril (E, -1) c. From the lower triangular, upper triangular and diagonal you should be able to reconstruct the matrix triu (E, 1) + tril (E, -1) + diag (E) Does this reconstruct E? If not, what do you need to do to fix this?