my array don't return the true value

1 次查看（过去 30 天）

显示更早的评论

tuan nguyen minh 2021-10-26

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1572113-my-array-don-t-return-the-true-value

评论： tuan nguyen minh 2021-10-28

i use this function:

function f =hpt(u1,u2,u3,u4,u5)

global P X G m Y mz_0 Cy Xt Xf mz_delta_b delta_b mz_omega_z b_a q S I_z;

f=[ (P*cos(-0.014)-X-G*sin(u2))/m,...

(P*sin(-0.014)+Y-G*cos(u2))/(m*u1),...

((mz_0+Cy*(Xt-Xf)+mz_delta_b*delta_b+mz_omega_z*b_a*(u3/u1))*q*S*b_a)/I_z,...

u3,...

u1*sin(u2)

];

end

with the input

gt_dau(1,:)=[V small_theta omega_z theta H] ;

k1=hpt(gt_dau(ii,1),gt_dau(ii,2),gt_dau(ii,3),gt_dau(ii,4),gt_dau(ii,5));

value of returned k1:

-0.000158173208030319 -0.000121964317063585 0 0 0

the third component is not right, not 0 but -0.000121965, so i wonder what i am doing wrong here?

2 个评论
显示无隐藏无

Jan 2021-10-26

We cannot run your code. Global variables are a shot in the knee of the programmer, so avoid them strictly. They are impeding the debugging of code massively.

Use the debugger to step through your code line by line. Then you will find out, why the value differ from your expectations.

Remember: All we see here is code, which we cannot run due to the missing input values. Even if the values are defined, we do not know, why you expect anything else.

tuan nguyen minh 2021-10-28