I get an error when trying to plot

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Elizabeth Frenzel
Elizabeth Frenzel 2023-5-15
回答： Image Analyst 2023-5-15
Ran in:
I do not get a line when I graph this. I am very new to coding and am struggling with the graphs.
clear
q=38.89 ; %W/m^3
r_o=0.04 ;
T_oo=5 ;
k=0.5 ;
c=10.1 ;
V=.1:1.0 ;
Temp(V)=q/(6*k)*(r_o^2)+(q*r_o)/(3*(c*V^0.425))+T_oo ;
Array indices must be positive integers or logical values.
Temp(Temp==0)=[];
figure
plot(.1:1,Temp)
xlabel('V *10^-1(m/s)')
xlim('auto')
ylim('auto')
ylabel('Temp (C)')
title('Temperature of center vs air velocity')

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采纳的回答

Image Analyst
Image Analyst 2023-5-15
Ran in:
Try making V a vector, and then using ./ and .^ because it's a vector:
clear
q=38.89 ; %W/m^3
r_o=0.04 ;
T_oo=5 ;
k=0.5 ;
c=10.1 ;
V = linspace(.1, 1.0, 500);
Temp = q/(6*k)*(r_o^2)+(q*r_o) ./ (3*(c*V.^0.425)) + T_oo
Temp = 1×500
5.1573 5.1563 5.1553 5.1543 5.1534 5.1524 5.1515 5.1506 5.1497 5.1489 5.1480 5.1472 5.1464 5.1456 5.1449 5.1441 5.1434 5.1427 5.1420 5.1413 5.1406 5.1399 5.1393 5.1386 5.1380 5.1374 5.1367 5.1361 5.1356 5.1350
Temp(Temp==0)=[];
figure
plot(V, Temp, 'b-')
grid on;
xlabel('V *10^-1(m/s)')
xlim('auto')
ylim('auto')
ylabel('Temp (C)')
title('Temperature of center vs air velocity')

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