I get an error when trying to plot

Question

Elizabeth Frenzel 2023-5-15

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1963284-i-get-an-error-when-trying-to-plot

回答： Image Analyst 2023-5-15

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')

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

Image Analyst 2023-5-15

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1963284-i-get-an-error-when-trying-to-plot#answer_1234939

在 MATLAB Online 中打开

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')