The following code was written by somebody who does not know how to use MATLAB efficiently.

Rewrite this as a single statement that will accomplish exactly the same thing for a matrix variable

mat $($i$.$e$.,$ vectorize this code$)$:

$[$r$,$ c$]=$ size $($mat$)$;

for i $=1$:r

for j $=1$:c

mat$($i$,$j$)=$ mat$($i$,$j$)*2$;

end

end