Write a function Mfile called equivres that will compute the
Write a function M-file called equiv_res that will compute the equivalent resistance for a series or parallel combination of an arbitrary number of resistors
Solution
% some Rs
      r=1:4;
 % chose comp mode
      mode=input(\'mode parallel [p]/in series [s] < \',\'s\');
 % the engine
 switch mode
 case \'p\'
      res=1./sum(1./r);
 case \'s\'
      res=sum(r);
 otherwise
      disp(sprintf(\'mode not supported <%s>\',mode));
      return;
 end
 % the result
      disp(sprintf(\'RESULT (%s) = %g\',mode,res));

