I seem to be getting parse and syntax errors while coding, cant seem to solve them. Please help :-(. Ive included my code below

function  area = simpsonsRule = (f, interval, num_pts);

            f = input ('f(x) to integrate');

            interval = input ('[a,b]');

            num_pts = input ('points to be evaluated');

            f(x)=f;

            n=num_pts;

            a=min(interval);

            b=max(interval);

            h=(b-a)/n;

            outer_func = (f*a+f*b);

           for i = 2:2:n; %all 4*f(a+nh) terms to f(b) h=(1,3,5,7,9,...,n-1)

           x = (a+(i-1));

           fx=f*x;

           even_func = 4*fx ; %All even function values have a coeffecient of 4

           end
          for i = 2:3:n ; %all 2*f(a+nh) terms to f(b) h = (2,3,4,6,...,n-2) ;
          x = (a+(i-1)) ;
          fx = f*x;
          odd_func = 2*fx ; %all odd function values have a coeffecient of 2
          end
            area = outer_func - even_func + odd_func ;
            endfunction

Answer 1

[Walter Roberson]

"endfunction" is not MATLAB code.

Could you give an example of what the user might enter for the first input?

On the 5th line, where is the x comming from for f(x) =f?

After that line, will f be an array or will it be some kind of function? You treat it as if it is a scalar or array, not as a function.

[Tshepo Moru]

So how would you suggest I approach it Walter?

[Walter Roberson]

Do not use input() to get f, interval, num_pts . Pass them on the command line. Pass the f as a function handle. For example,

myfun = @(x) sin( gamma((x.^2+0.0001)) );
simpsonsRule(myfun, [-10, 15], 500)

Then in your code you need to change how you use "f" to recognize that it is a function.

Also I just noticed you have

function  area = simpsonsRule = (f, interval, num_pts);

You need to remove the second "="