### $4.$ Function for Body Mass Index

In previous problem, you just calculate BMI with given conditions. Now, make a function m$-$file named $***$BMI$***$ which accept two parameters, i$.$e$.,$ weight and height and calculate the BMI and return $1($underweight case$),0($optimal case$),$ or $1($overweight case$).$ With your own function m$-$file, make the following dat files and submit them.

$-$ calculate BMI with weight range $$80$lb$$W$250$lb$$,$$$$W$=0\mathrm{.}5$lb$ and height $H$=62$inches$ and save the return values $($series of $-1,0,$ or $1)$ on $***$HW$2\_8.$dat$***$ file $(1$ by some matrix$)$

$-$ calculate BMI with weight $W $=180$ lb$ and height range $$50$ inches $$ H $80$ inches$$,$ $$$ H $=0\mathrm{.}5$ inch$ and save the return values $($series of $-1,0,$ or $1)$ on $***$HW$2\_9.$dat$***$ file$(1$ by some matrix$)$

$-$ calculate BMI with weight $W $=200$ lb$ and height range $$60$ inches $$ H $84$ inches$$,$ $$$ H $=0\mathrm{.}5$ inch$ and save the return values $($series of $-1,0,$ or $1)$ on $***$HW$2\_10.$dat$***$ file $(1$ by some matrix$)$