LAB $3$

A$.$ Study the code given below and answer the questions that follow:

function $xb=$ incsearch $($func$,$ xmin,xmax,$ns)$

if nargin error$(\text{'}$at least $3$ arguments required'$),$ end

if nargin ; end

$x=$ linspace $($xmin$,$ xmax,ns$)$;

$f=$func$(x)$;

$nb=0$;$xb=[]$;

for $k=1$ : length $(x)-1$

if $)$

$b=nb+1$;

$,xb(nb,1)=x(k)$;

$,xb(nb,2)=x(k+1)$;

end

end

if isempty $(xb$

disp$(\text{'}$no brackets found'$)$

disp $(\text{'}$check interval or increase ns$\text{'})$

else

disp$(\text{'}$number of brackets:$\text{'})$

disp $($nb$)$

end

What does this function do$?$

Look up the MATLAB function nargin. What value is returned by nargin if the followins function called is made?

what value of $n$ s was utilized in the function call above?

What does $k$ represent? Check lines $7,8,10,$ and $11.$

What function syntax can be used to pass func to incsearch?

For each iteration, what is the size of $xb?$