Error when plotting.... No points shown in graph

2020 9 27
2 个回答
更新时间：2023 9 1
13 次查看（30 天）

0 个投票

Hello! I am having trouble plotting my graph. Here is my code. It shows the graph but nothing is plotting. Any idea what is happening? Please let me know! Thank you
xlabel('Time')
ylabel('Thrust')
title('Thrust Varying With Time')
x = linspace(0,0.001,1);
y = linspace(0,5,500);
A = (pi*(.021336)^2)/4;
Po = 400000;
Patm = 101325;
f(x)= (2*(Po-Patm)*A)*x;
plot (x,f(x))

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回答（2 个）

Ameer Hamza
Ameer Hamza 2020-9-27
编辑：Ameer Hamza 2020-9-27

0 个投票

The left side of the line
f(x)= (2*(Po-Patm)*A)*x;
is not correct. f(x) represent indexing into f using x vector, which is only allowed if all values in x are integers. You don't need that here. Check this code
x = linspace(0,0.001,100);
A = (pi*(.021336)^2)/4;
Po = 400000;
Patm = 101325;
f = (2*(Po-Patm)*A)*x;
plot(x, f)
xlabel('Time')
ylabel('Thrust')
title('Thrust Varying With Time')

0 个投票

Hello, I am plotting a root locus graph based on the following code:
num=[1];
den=[1 3 0];
sys=tf(num,den)
rlocus(sys)
My plot appears but empty. No data.

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