How to plot a values inside a while loop .
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I need help , i want to plot the evelotion of time t and Temperateurs T1-T2-T3-T4-T5-T6-T7-T8-Tout but all i got is a blank graph when i use the plot . i know that i need to store all the values in an array , but i couldnt do it . so i need also to see how i can store all the iterations insode a big array , and how can i plot the temperateurs in function of tima t .
please help ;
Thank you .
clc; clear;
LmdC=1.6;
LmdIn=0.04;
RoC=1800;
RoIn=100;
CpC=900;
CpIn=1100;
h=10;
DxC=0.02;
DxIn=0.05;
Dt=200;
t=0;
AC=(LmdC/DxC); %constant
AIn=(LmdIn/DxIn); %constant
DC=(Dt/(DxC*CpC*RoC)); %constant
DIn=(Dt/(DxIn*CpIn*RoIn)); %constant
AlphaC=(1/((DxC/2*LmdC)+(DxIn/2*LmdIn))); %constant
AlphaAir=(1/((DxIn/(2*LmdIn))+(1/h))); %constant
Tin=10;
TExt=0;
T1=0;
T2=0;
T3=0;
T4=0;
T5=0;
T6=0;
T7=0;
T8=0;
Tout=0;
while t<176400
H=3600;
fprintf('\t\t%g\t\t%g\t\t%g\t\t%g\t\t%g\t\t%g\t\t%g\t\t%g\t\t%g\t\t%g\n',t,T1,T2,T3,T4,T5,T6,T7,T8,Tout);
Tout=8*sin((pi/(12*H))*t);
T1=(AC*DC*(2*Tin-3*T1+T2))+T1;
T2=(AC*DC*(T1-2*T2+T3))+T2;
T3=(AC*DC*(T2-2*T3+T4))+T3;
T4=(AC*DC*(T3-2*T4+T5))+T4;
T5=((AC*(T4-T5)-(AlphaC*(T5-T6)))*DC)+T5;
T6=((AlphaC*(T5-T6)-(AIn*(T6-T7)))*DIn)+T6;
T7=(AIn*DIn*(T6-2*T7+T8))+T7;
T8=(AIn*(T7-T8)-(AlphaAir*(T8-Tout)))*DIn+T8;
%plot(t,T1,t,T2,t,T3,t,T4,t,T5,t,T6,t,T7,t,T8,t,Tout)
t=t+Dt;
end
回答（1 个）
Star Strider
2020-9-21
The easiest way is to store the intermediate results, then plot them at the end:
while t<176400
H=3600;
fprintf('\t\t%g\t\t%g\t\t%g\t\t%g\t\t%g\t\t%g\t\t%g\t\t%g\t\t%g\t\t%g\n',t,T1,T2,T3,T4,T5,T6,T7,T8,Tout);
Tout=8*sin((pi/(12*H))*t);
T1=(AC*DC*(2*Tin-3*T1+T2))+T1;
T2=(AC*DC*(T1-2*T2+T3))+T2;
T3=(AC*DC*(T2-2*T3+T4))+T3;
T4=(AC*DC*(T3-2*T4+T5))+T4;
T5=((AC*(T4-T5)-(AlphaC*(T5-T6)))*DC)+T5;
T6=((AlphaC*(T5-T6)-(AIn*(T6-T7)))*DIn)+T6;
T7=(AIn*DIn*(T6-2*T7+T8))+T7;
T8=(AIn*(T7-T8)-(AlphaAir*(T8-Tout)))*DIn+T8;
Tm(i,:) = [t T1 T2 T3 T4 T5 T6 T7 T8 Tout]; % <— ADD THIS
i = i+1; % <— ADD THIS
t=t+Dt;
end
figure
plot(Tm(:,1),Tm(:,2:end))
grid
Then the plot appears after the loop.
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2020-9-21
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