Help needed: empty plot when plotting for loop

JD
2019 9 17
1 个回答
回答已采纳
更新时间：2019 9 18
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0 个投票

Hello,
Below is my code. I am trying to plot all values of the for loop but I am getting an empty plot. What am I doing incorrectly?
for i=2:1:1369
a = (V(i+1)-V(i-1))/(2*(t(i+1)-t(i-1)));
A = ((1/2)*Rhoa*Cd*Af*(V(i).^3));
G = (Mv*g*cos(0).*V(i));
I = (1.1*Mv.*a.*V(i));
Pw = (A+G+I)/1000;
end
figure
hold on
i=2:1:1369;
plot(i,Pw);
grid
xlabel('Time (s)')
ylabel('Power, Pw (KW)')
set(h,'linewidth',2)

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 采纳的回答

Walter Roberson
Walter Roberson 2019-9-17

1 个投票

Do not assign to Pw. Instead assign to Pw(i-1)

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JD
JD 2019-9-18
That worked!! Thank you so much!!
JD
JD 2019-9-18
Hi Walter,
After being able to plot the graph based on your response to this question, I realized my for loop is not doing what I want. Would you be able to help with the below question as well?
Thanks
https://www.mathworks.com/matlabcentral/answers/480854-how-to-reference-a-variable-saved-as-mat-file-to-execute-code

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