roots

roots(v) returns the zeros of the polynomial represented by v.

Examples

>> r = roots([1,3,-7])	
% solve x2+3x-7

r#

     -4.54138
      1.54138
	  
>> f = @(x) x.^2+3*x-7
x = [-5:0.2:2]
o = struct('show',false)
overlay({plot(x,f(x),o), scatter(r,zeros(numel(r)),o)})

[x:1x36 double]
[o:1x1 struct]
[ans:1x1 struct] 0.216000s

See also

bisection