I need to help with this code error in undefined function or variable 'ArrayRT1' and plot (ArrayRT1,ArrayRT,2ArrayRM1,ArrayRM2) ,grid

Question

Aseel Mgig 2019-8-3

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/474679-i-need-to-help-with-this-code-error-in-undefined-function-or-variable-arrayrt1-and-plot-arrayrt1

回答： dpb 2019-8-3

 % code
n=0;
VM = 3000.;
VT = 1000.;
XNT = 0.;
HEDEG = -20.;
XNP = 4.;
RM1 = 0.;
RM2 = 10000.;
RT1 = 40000.;
RT2 = 10000.;
BETA=0.;
VT1=-VT*cos(BETA);
VT2=VT*sin(BETA);
HE=HEDEG/57.3;
T=0.;
S=0.;
RTM1=RT1-RM1;
RTM2=RT2-RM2;
RTM=sqrt(RTM1*RTM1+RTM2*RTM2);
XLAM=atan2(RTM2,RTM1);
XLEAD=asin(VT*sin(BETA+XLAM)/VM);
THET=XLAM+XLEAD;
VM1=VM*cos(THET+HE);
VM2=VM*sin(THET+HE);
VTM1 = VT1 - VM1;
VTM2 = VT2 - VM2; 
VC=-(RTM1*VTM1 + RTM2*VTM2)/RTM;
while VC <=0 
if RTM < 1000 
    H=.0002; 
else H=.01; 
end
BETAOLD=BETA;
RT1OLD=RT1;
RT2OLD=RT2;
RM1OLD=RM1;
RM2OLD=RM2;
VM1OLD=VM1;
VM2OLD=VM2;
STEP=1;
FLAG=0;
while STEP <=1 
if FLAG==1 
STEP=2;
BETA=BETA+H*BETAD;
RT1=RT1+H*VT1;
RT2=RT2+H*VT2; 
RM1=RM1+H*VM1; 
RM2=RM2+H*VM2; 
VM1=VM1+H*AM1; 
VM2=VM2+H*AM2; 
T=T+H; 
end
RTM1=RT1-RM1;
RTM2=RT2-RM2;
RTM=sqrt(RTM1*RTM1+RTM2*RTM2);
VTM1=VT1-VM1;
VTM2=VT2-VM2;
VC=-(RTM1*VTM1+RTM2*VTM2)/RTM;
XLAM=atan2(RTM2,RTM1); 
XLAMD=(RTM1*VTM2-RTM2*VTM1)/(RTM*RTM); 
XNC=XNP*VC*XLAMD; 
AM1=-XNC*sin(XLAM); 
AM2=XNC*cos(XLAM); 
VT1=-VT*cos(BETA); 
VT2=VT*sin(BETA); 
BETAD=XNT/VT; 
FLAG=1;
end
FLAG=0; 
BETA=.5*(BETAOLD+BETA+H*BETAD); 
RT1=.5*(RT1OLD+RT1+H*VT1); 
RT2=.5*(RT2OLD+RT2+H*VT2); 
RM1=.5*(RM1OLD+RM1+H*VM1); 
RM2=.5*(RM2OLD+RM2+H*VM2); 
VM1=.5*(VM1OLD+VM1+H*AM1); 
VM2=.5*(VM2OLD+VM2+H*AM2); 
S=S+H; 
if S >=.09999 
   S=0.; 
   n=n+1; 
   ArrayT(n)=T; 
   ArrayRT1(n)=RT1; 
   ArrayRT2(n)=RT2; 
   ArrayRM1(n)=RM1; 
   ArrayRM2(n)=RM2; 
   ArrayXNCG(n)=XNC/32.2; 
   ArrayRTM(n)=RTM; 
end
end
RTM 
figure
plot(ArrayRT1,ArrayRT2,ArrayRM1,ArrayRM2),grid 
title('Two-dimensional tactical missile-target engagement simulation') 
xlabel('Downrange (Ft)') 
ylabel('Altitude (Ft)') 
figure
plot(ArrayT,ArrayXNCG),grid 
title('Two-dimensional tactical missile-target engagement simulation')
xlabel('Time (sec)') 
ylabel('Acceleration of missle (G)') 
clc 
output=[ArrayT',ArrayRT1',ArrayRT2',ArrayRM1',ArrayRM2',ArrayXNCG',ArrayRTM' ]; 
disp '*** Simulation Complete'

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Answer 1

dpb 2019-8-3

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/474679-i-need-to-help-with-this-code-error-in-undefined-function-or-variable-arrayrt1-and-plot-arrayrt1#answer_386025

在 MATLAB Online 中打开

I run your code and find--

...
    
RTM =
       40000
Undefined function or variable 'ArrayRT1'. 

Exploring, one finds that

>> S
S =
     0
>> S=S+H
>> H
Undefined function or variable 'H'. 
Did you mean:
whos H
>> 

And since you wrote the conditional

...
S=S+H; 
if S >=.09999 
   S=0.; 
   n=n+1; 
   ArrayT(n)=T; 
   ArrayRT1(n)=RT1; 
   ArrayRT2(n)=RT2; 
   ArrayRM1(n)=RM1; 
   ArrayRM2(n)=RM2; 
   ArrayXNCG(n)=XNC/32.2; 
   ArrayRTM(n)=RTM; 
end
...

all the Array* variables are only computed if S>=0.09999 but S is still identically 0. Hence, you've never defined them yet.

Use the debugger and step through and see where your logic errors are...consistent indenting of the code for loop and other conditional construct will aid remarkably in being able to more fully see code structure.