Plot function with changing variables

5 次查看（过去 30 天）
Katie Fox
Katie Fox 2019-9-29
评论： Star Strider 2019-9-29
for v = 5:20 d = 20:120
w = (0.25*pi*(d.^2)*0.5*(v.^2))
plot(v,w)
hold on
end
% I am trying to plot v on the x axis, w on the y and vary the variable v between 5 and 20 and d between 20 and 120. I am new to Matlab why won't the graph appear? It just shows a blank white sceen?

请先登录，再回答此问题。

采纳的回答

Star Strider
Star Strider 2019-9-29
The plot function plots lines between two points. You appear to be plotting points, so you need to plot markers.
Try this:
for v = 5:20
for d = 20:120
w = (0.25*pi*(d.^2)*0.5*(v.^2));
plot(v,w,'.')
hold on
end
end
Experiment to get the result you want.
  2 个评论
Katie Fox
Katie Fox 2019-9-29
Thank you, is there a way to connect the points for a given value for d? I am hoping to end up with 120 lines based on the variable d?
Star Strider
Star Strider 2019-9-29
As always, my pleasure!
‘I am hoping to end up with 120 lines based on the variable d?’
Try this:
d = 20:120;
v = 5:20;
[V,D] = ndgrid(v, d);
w = @(v,d) (0.25*pi*(d.^2)*0.5.*(v.^2));
figure
plot(D, w(V,D))
xlabel('d')
ylabel('w')
Note that here ‘d’ only has 101 values, not 120.
Experiment to get the result you want.

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 2-D and 3-D Plots 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by