Hi, You use a for statement but I cant see no one indexed variable inside the loop. Maybe you would like to to this :
num_col = size（m，2）;
fori = 1：num_col;
cl(i)=W./(0.5*2116.2*1.4*S*M(i).^2);
ifM(i)<=0.8 ;
cd0l(i)=0.015;
k(i)=1/(pi*6*0.7);
elseifM(i)>=1.2;
cd0l(i)=(0.015+(3*0.015-0.015)*(sin((2*pi)/3))^3);
k（i）=（1/（pi*6*（0.7-7*（0.4）^2+22*（0.4）^3）））;
else
CD0L（i）=（0.015+（3*0.015-0.015）。*sin（（m（i）-0.8）./ 0.6*pi）。^3）;
k（i）=（1./(pi*6* 6（0.7-7*（m :)-0.8).。^2+（m（m :)-0.8).。^3).4.22））;
end
cd(i)=cd0l(i)+k(i).*cl(i).^2;
D(i)=0.5.*cd(i).*1.4.*2116.2.*S.*M(i).^2;
end
If yes, you can this program without use for statement in a easy form.
m1tch
