没有。为负值创建一个红色的绘图,使用hold on
,然后使用蓝色绘制正值。
x = [-10:0.1:10].'; %//range
x1 = x(x<=0); %//negative values and zero
x2 = x(x>=0); %//positive values and zero
figure; %//open figure
hold on %// plot things in the same figure
plot(x1,x1,'r') %//plot negative values
plot(x2,x2,'b') %//plot positive values