$3.$ Matrix variables. Make the following variables $2!2$ a$.$ aMat $="$#$"$ a $9$x$9$ matrix full of $2$s $($use ones or zeros$)2!210!00"0"$ b$.$ bMat $=$# $050$ #$$ a $9$x$9$ matrix of all zeros, but with the values $"0"00!01[123454321]$ on the main diagonal $($use zeros, diag$).111!91212"92$ c$.$ cMat $=$ a $10$x$10$ matrix where the vector $1$:$100$ runs down the $$ # # $"$ # $1020!100$ columns $($use reshape$).$NaN NaN NaN NaN$$ d$.$ dMat $=$ NaN NaN NaN NaN a $3$x$4$ NaN matrix $($use nan$)$NaN NaN NaN NaN$13-15$ e$.$ eMat $=-2210-87$ f$.$ Make fMat be a $5$x$3$ matrix of random integers with values on the range $-3$ to $3($First use rand and floor or ceil. Now only use randi$)$