why my matlab didn't plot anything?
2 ビュー (過去 30 日間)
古いコメントを表示
So i tried to plot a graph using this code, but it won't plot anything. I believe my code is plotting a point but not a line and i don't know why
clear all
m = 85
g = 9.81
ti = 0
tf1 = 9
v(1)= -20
h = 1
c1 = 11
dv1 = @(g,c1,v,m) g-c1*v/m
while(ti<tf1)
v = v + dv1(g,c1,v,m)*h
ti = ti+h
plot(ti,v)
drawnow
end
0 件のコメント
採用された回答
その他の回答 (1 件)
DGM
2021 年 9 月 10 日
編集済み: DGM
2021 年 9 月 10 日
Start with something like this:
m = 85;
g = 9.81;
ti0 = 0;
tf1 = 9;
v0 = -20;
h = 1;
c1 = 11;
dv1 = @(g,c1,v,m) g-c1*v/m;
ti = ti0:h:tf1;
v = zeros(1,numel(ti));
v(1) = v0;
for k = 2:numel(ti)
v(k) = v(k-1) + dv1(g,c1,v(k-1),m)*h;
end
plot(ti,v)
Plotting one point at a time is generally unnecessary and cumbersome. When you plot single points that way with the default linestyle, they are not connected by lines. You could make the dots themselves visible by specifying a marker type other than the default, but storing the results and putting the plot statement outside the loop avoids the hassle and leaves you with vectors that can be used for other things if needed.
It's also generally good to avoid unnecessary while loops, using for-loops when the number of iterations is known beforehand. This avoids any chance of mistakes or unpredicted scenarios that could cause the loop to not terminate. Such an oversight isn't really a big risk with something this small, but it's something to keep in mind as your code gets more complex.
0 件のコメント
参考
カテゴリ
Help Center および File Exchange で Graphics Performance についてさらに検索
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!