[英]Animating plot with matlab / octave
I'm trying to animate a plot for this equation see below I'm trying to animate it for b when 300>= b <= 486 我正在为该方程式的动画制作动画,请参见下文,当300> = b <= 486时,我正在为b制作动画效果
clear all, clc,clf,tic
m=3.73;
a=480;
b=486;
r=1;
fs=44100;
x=linspace(0,2*pi,fs)';
y=m^3*cos(sqrt(a*r*x)).^(0.77)/r + m^3*cos(sqrt(b*r*x)).^(0.77)/r-20;
normalize_y=(y/max(abs(y))*0.8);
plot(x,y)
I'm using octave 3.8.1 which is a clone of matlab 我正在使用octave 3.8.1,这是matlab的克隆
Put your plotting code in a for
loop with b
as the iterating variable, then place a pause
for a small amount of time. 将绘图代码放入带有b
作为迭代变量的for
循环中,然后pause
一小段时间。 After, plot your graph, then use drawnow
to refresh the plot. 之后,绘制图形,然后使用drawnow
刷新图形。 In other words, try this code. 换句话说,请尝试此代码。 I've placed %// Change
comments in your code where I have introduced new lines: 我已经在您的代码中引入%// Change
地方添加了%// Change
注释,并在其中添加了新行:
m=3.73;
a=480;
r=1;
fs=44100;
x=linspace(0,2*pi,fs)';
figure;
for b = 300 : 486 %// Change
y=m^3*cos(sqrt(a*r*x)).^(0.77)/r + m^3*cos(sqrt(b*r*x)).^(0.77)/r-20;
normalize_y=(y/max(abs(y))*0.8);
pause(0.1); %// Change
plot(x,y);
title(['b = ' num2str(b)]); %// Change
drawnow; %// Change
end
As a bonus, I've put what the current value of b
is at each drawing of the plot. 作为奖励,我将b
的当前值放在图的每个图上。 BTW, I don't know why normalize_y
is in your code when you aren't using it. 顺便说一句,我不知道为什么当您不使用normalize_y
在您的代码中。 Do you mean to plot normalize_y
instead of y
? 您是要绘制normalize_y
而不是y
吗? Just an after thought. 只是经过一番思考。 Anyway, try that out and see how it looks. 无论如何,尝试一下,看看外观如何。 Good luck! 祝好运!
Another solution would be to use the handle of a plot and then only update the 'YData'
-property of a plot. 另一种解决方案是使用图的句柄,然后仅更新图的'YData'
属性。 That is especially useful for more complex plots where there are more than 1 line but you only want to change one line. 这对于多于一条线但您只想更改一条线的更复杂的图尤为有用。 Also Axis-labels are not overwritten then, which generally prevents alot of overhead. 轴标签也不会被覆盖,这通常可以避免很多开销。 In Matlabcode it could look like this: 在Matlabcode中,它可能看起来像这样:
% // Parameter and x-range
m=3.73;
a=480;
r=1;
fs=44100;
x=linspace(0,2*pi,fs)';
% // function to compute y for given x and parameter b
f = @(x, b) m^3*cos(sqrt(a*r*x)).^(0.77)/r + m^3*cos(sqrt(b*r*x)).^(0.77)/r-20;
% // first plot out of loop (to get plot handle)
figure;
b = 300;
y = f(x, b);
handle = plot(x, y);
xlabel('x') % // only set once
ylabel('y=f(x,b)') % // only set once
title(['b = ' num2str(b)]);
pause(0.1);
% // animate for b = 301 to 86
for b = 301:486 %// Change
set(handle, 'YData', f(x, b)) % set new y-data in plot handle
pause(0.1); %// update plot
title(['b = ' num2str(b)]); %// update title
end
This will work with octave 3.8.1 这将适用于八度3.8.1
% // Parameter and x-range
m=3.73;
a=480;
r=1;
fs=44100;
x=linspace(0,2*pi,fs)';
% // function to compute y for given x and parameter b
f = @(x, b) m^3*cos(sqrt(a*r*x)).^(0.77)/r + m^3*cos(sqrt(b*r*x)).^(0.77)/r-20;
% // first plot out of loop (to get plot handle)
figure;
b = 300;
y = f(x, b);
handle = plot(x, y);
xlabel('x') % // only set once
ylabel('y=f(x,b)') % // only set once
title(['b = ' num2str(b)]);
pause(0.1);
% // animate for b = 301 to 86
for b = 301:486 %// Change
%set(handle, 'YData', f(x, b)) % set new y-data in plot handle
%To work with octave 3.8.1 use the line below
set(handle, 'YData', real (f(x, b)))
pause(0.1); %// update plot
title(['b = ' num2str(b)]); %// update title
end
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