Write a function smat_transpose that takes a data frame representation of a sparse matrix as a coordinate list and computes its transpose Write a test suite of functions to verify that casl_sparse_add...

Write a function smat_transpose that takes a data frame representation of a sparse matrix as a coordinate list and computes its transpose

Write a test suite of functions to verify that casl_sparse_add and casl_sparse_multiply work as expected.

Q45;

Modify the sparsity of the simulated data matrix Xd on page 304 to make the matrix ten-times more sparse. How do the sizes of Xs and qrs change as a result? What if you increase the sparsity by a factor of 3?

The function Rprof in the utils package can keep track of R’s memory usage. Use this to verify that our function casl_sparse_irwls does not create a dense version of the data matrix