e0561.m

Matlab7.x程序设计-王建卫-源代码及习题答案

syms x;s=double(solve('x^3-2*x-5=0','x'));
for ii=1:length(s)
    a=isreal(s(ii));
    if a==1
        if s(ii)<=3&s(ii)>=0
            x=s(ii)
        end
     end
end