Initialize the vector v with $443$ values from $0$ to $2\backslash$pi $,$ where each element is defined as vi $=$ sin$(2\backslash$pi i $/442\mathrm{.}0).$ This is just a simple sine curve with a period from $0$ to $2\backslash$pi $,$ diced up into a vector of $443$ elements, including $0.$ You are going to multiply this by the sparse matrix you downloaded already, which happens to

be sized $443$ x $443$ elements.