Suppose Jerry Gergich wrote the function below to count the number of missing values in a

vector:

count$\_$missing function$(x)\{$

for $($i in $1$: length $(x))\{$

if

$\}$

na$\_$counter $+1$

$\}$

$\}$

Assuming a working version of

$,$ write a command that will count the

number of missing values in any vector $x,$ ignoring its first and last elements.