Plot animation Effcientcey and double to struct error

1 次查看（过去 30 天）
Lawson Hoover
Lawson Hoover 2012-12-8
I am trying to animate a plot. I have got it to work but I seems to moving a tad slow, and Also when I allocate the frames into a variable M with getframe, the M gets a red underline saying that I should preallocate for speed. I have been trying to do this but I get is the error:
The following error occurred converting from struct to double:
Error using double
Conversion to double from struct is not possible.
I have no idea how to fix this. The code I am using is below:
plot(x,y,'--r','LineWidth',3); % original position
xlabel('Beam Length (in.)','Color','g');
ylabel(bstr,'Color','g');
ylim([-(Beam.y(10)) max(Beam.y)]);
title(astr,'Color','y','fontweight','b');
set(S.ax,'YDir','reverse');
set(S.ax,'XGrid','on');
set(S.ax,'YGrid','on');
y =0;
z = 0;
hold on
clear M
M = zeros(1,100);
ht = plot(y,z,'-b','linewidth',2); % new position
for i = 1:100
if i == 1
set(ht ,'XDataSource','Beam.x')
set(ht,'YDataSource','Beam.y')
end
set(ht,'XData',Beam.x(1:i))
set(ht,'YData',Beam.y(1:i))
M(i) = getframe(gcf); % this says that I shoudld preallocate it but when I do I get an error
end
legend('Without Deflection','With Deflection');
hold off

请先登录，再回答此问题。

回答（1 个）

Walter Roberson
Walter Roberson 2012-12-8
getframe() returns a movie frame, which is a struct. You cannot store a struct into a scalar double location such as M(i) where M has been initialized to zeros(1,100)
http://www.mathworks.com/help/matlab/ref/getframe.html
What are you going to do with the frames after you get them? If you are going to create a video, then see the documentation for VideoWriter for an example of how to do it.
  3 个评论
显示 1更早的评论
Alexander
Alexander 2013-4-24
Thank you so much! That error was had me stuck all day!

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Animation 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