八度绘图点作为动画 [英] Octave plot points as animation

问题描述

我有以下八度音阶脚本，

I have the following octave script,

TOTAL_POINTS = 100;
figure(1)

for i=1:TOTAL_POINTS
   randX = rand(1); 
   randY = rand(1);

   scatter(randX, randY);
   hold on; 
endfor

当我用octave script.m运行它时，我什么也没得到.当我将pause行添加到此脚本的末尾时，它可以工作，但是我只在绘制所有100点之后才能看到该图.

When I run this by octave script.m, I get nothing. When I add the line pause to the end of this script, it works but I only see the plot after all the 100 points are plotted.

我想逐点查看情节.我画完每一个点后就没有了.

I want to see the plot point by point. Not after I plotted every single point.

PS:我有Ubuntu.

推荐答案

尝试添加

Try adding drawnow at the end of the iteration. At least that works in Matlab. It forces the interpreter to empty the graphic event queue.

如果在迭代末尾包含pause，则可能不需要drawnow(pause已清空事件队列).但是我通常会添加它，以防万一.

If you include pause at the end of the iteration, drawnow may not be needed (pause already empties the event queue). But I usually add it just in case.

其他评论:

• 您不需要每次迭代都使用hold on.一开始就做一次就足够了.
• 您可能希望冻结轴以防止在添加新点时自动缩放

• You don't need hold on at every iteration. It sufficies to do it once, at the beginning.
• You may want to freeze the axis to prevent auto-scaling when a new point is added

通过这些修改，您的代码将变为:

With these modifications, your code would become:

TOTAL_POINTS = 100;
figure(1)
hold on; 
axis([0 1 0 1]) %// set axis
axis manual %// prevent axis from auto-scaling
for i=1:TOTAL_POINTS
   randX = rand(1); 
   randY = rand(1);
   scatter(randX, randY);
   pause(.1) %// pause 0.1 seconds to slow things down
   drawnow
endfor

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