the design of fuzzy logic----input

   Let's design a car -brake system ^_^. firstly ,we would be sure that how speed is now ,if it is slow,medium or fast .then ,we can judge the brake level .
   Assurm that we just have one input-----speed .and it will between0 and 100 miles .if it is 0-25,the impression is slow that appeared in our mind ,if it is 50-75, medium ..if it is 75-100,oh ,very fasr ,we should take a higher lever brake .
   we can transfer our ideas about speed into math words.Like that :
cnt = 1


for x=1:100



if x>=50

slowly(cnt,1:2)=[x, 0];

else if x>=0&&x<=25

slowly(cnt,1:2)=[x ,1];

else if x>=25&&x<=50

slowly(cnt,1:2)=[x, -0.04*x+2];

end

end

end

cnt=cnt+1

end



mnt =1

for y=1:100



if y>=50&&y<=75

medium (mnt,1:2)=[y, -0.04*y+3];

else if y>=0&&y<=25

medium(mnt,1:2)=[y ,0];

else if y>=25&&y<=50

medium(mnt,1:2)=[y, 0.04*y-1];

else if y>75

medium (mnt,1:2)=[y, 0];

end

end

end

end



mnt=mnt+1

end



bnt=1

for z=1:100

if z<=50

fast(bnt,1:2)=[z,0];

else if z>=50&&z<=75

fast(bnt,1:2)=[z 0.04*z-2];

else if z>=75

fast(bnt,1:2)=[z ,1]

end

end

end

bnt=bnt+1

end



plot(fast(:,1),fast(:,2))

hold on

plot(medium(:,1),medium(:,2))

hold on

plot(slowly(:,1),slowly(:,2))


And the graph of speed idea is

It is very simple ,hehe .the first step.