How do I use the svd() function to compute the rank-1 and rank-2 approximation of a matrix and round it to a specific decimal? What does the code look like for that? How is the root mean square error (RMSE) computed?

How do I use the imshow() function to display a compressed version of an image; derive the value ofkthat will result in a compression ratio ofCR 2. For this value ofk,construct the rank-kapproximation of an image.

Find the compression ratio of CR 10, CR 25, and CR 75. What trends are apparent in the approximation as CR increases. What is the best CR? How is the code supposed to look for these functions?