For loop if else if statement not working

Question

Austen Thomas 2018-2-16

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/383065-for-loop-if-else-if-statement-not-working

回答： Use 2018-8-7

I am trying to make a graph where two different sets of equations need to be used at different h values but i keep getting the error code "Undefined function 'h' for input arguments of type 'double'"

can anyone correct my code and explain to me why this is wrong? Thanks

g=32.2;
R=1716;
a=-0.003563;
x = g./(a.*R);
y = g/R;
T_SSL=518.69;
rho_SSL=0.002377;
hv = 1:50:45000;
for i = 1:numel(hv)
  if (h(i) <= 36152)
    % lower then 36152
    h(i) = hv(i);
    T(i) = T_SSL+a*h(i);
    rho(i) = rho_SSL*((T(i)/T_SSL)^-(x+1));
   TH(i) = 6647034.077*rho(i);
  elseif(h(i) > 36152)
   % for over 36152 ft
   h(i) = hv(i);
   T(i) = 389.7;
   rho(i) = rho_SSL*exp(-(y/T(i))*h(i));
   TH(i) = 6647034.077*rho(i);
  end
end
plot (h,TH);
xlabel('Altitude (ft)');
ylabel('Power Avaiable (hp)');
title('Power Avaiable vs Altitude');

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

KSSV 2018-2-16

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/383065-for-loop-if-else-if-statement-not-working#answer_305493

在 MATLAB Online 中打开

g=32.2;
R=1716;
a=-0.003563;
x = g./(a.*R);
y = g/R;
T_SSL=518.69;
rho_SSL=0.002377;
hv = 1:50:45000;
for i = 1:numel(hv)
  if (hv(i) <= 36152)
    % lower then 36152
    h(i) = hv(i);
    T(i) = T_SSL+a*h(i);
    rho(i) = rho_SSL*((T(i)/T_SSL)^-(x+1));
   TH(i) = 6647034.077*rho(i);
  elseif(hv(i) > 36152)
   % for over 36152 ft
   h(i) = hv(i);
   T(i) = 389.7;
   rho(i) = rho_SSL*exp(-(y/T(i))*h(i));
   TH(i) = 6647034.077*rho(i);
  end
end
plot (h,TH);
xlabel('Altitude (ft)');
ylabel('Power Avaiable (hp)');
title('Power Avaiable vs Altitude');