Matlab仿真：点（符号）从开始点移动到终点和背部 [英] Matlab Simulation: Point (symbol) Moving from start point to end point and back

问题描述

我想创建一个动画来演示其基于积算法

I would like to create an animation to demonstrate LDPC coding which is based on Sum-Product Algorithm

到目前为止，我已经创建了一个图表，显示符号节点（左）和奇偶校验节点（右）并愿动画旅游点从符号到平价节点和背部。

So far I have created a graph which shows the connections between symbol nodes (left) and parity nodes (right) and would like to animate points travelling from symbol to parity nodes and back.

这个数字是通过执行以下方法得出：

The figure is drawn by executing the following method:

function drawVertices(H)
hold on;
nodesCount = size(H);
parityNodesCount = nodesCount(1);
symbolNodesCount = nodesCount(2);
symbolPoints = zeros(symbolNodesCount, 2);
symbolPoints(:, 1) = 0;
for i = 0 : symbolNodesCount - 1
    ji = symbolNodesCount - i;
    scatter(0, ji)
    symbolPoints(i + 1, 2) = ji;

end;
parityPoints = zeros(parityNodesCount, 2);
parityPoints(:, 1) = 10;
for i = 0 : parityNodesCount - 1
    ji = parityNodesCount - i;
    y0 = symbolNodesCount/2 - parityNodesCount/2;
    scatter(10, y0 + ji)
    parityPoints(i + 1, 2) = y0 + ji;
end;
axis([-1 11 -1 symbolNodesCount + 2]);
axis off

%connect vertices
d = size(H);
for i = 1 : d(1)
    for j = 1 : d(2)
        if(H(i, j) == 1)
            plot([parityPoints(i, 1) symbolPoints(j, 1)], [parityPoints(i, 2) symbolPoints(j, 2)]);
        end;
    end;
end;

所以我想在这里做什么是添加另一这需要启动点（x和y）和终点作为参数，并以动画从开始旅游圈（点）沿显示的行结束，背法。

So what I would like to do here is to add another method which takes start point (x and y) and end point as arguments and animates a travelling circle (dot) from start to end and back along the displayed lines.

我想AP preciate如果你们任何人都可以展示的解决方案或建议有关MATLAB仿真任何有用的教程。

I would appreciate if anyone of you could show the solution or suggest any useful tutorial about matlab simulations.

感谢您！

推荐答案

我认为最好的学习方法是通过例子。因此，我建议你看一下演示洛伦茨附带MATLAB：

I believe the best way to learn is by example. So I suggest you look at the demo lorenz which comes with MATLAB:

edit lorenz

有关其他的酷的动画，找 orbits.m 和 swinger.m 演示克里夫·莫勒尔的书的一部分： rel=\"nofollow\">实验

For other cool animations, look for orbits.m and swinger.m demos part of Cleve Moler's book: Experiments with MATLAB

我在这里展示沿圆形路径移动的一个点一个简单的动画。保持想法归结为使用 EraseMode 设置为 XOR ，并更新扩展数据和 YDATA ：

I show here a simple animation of a point moving along a circular path. The hold idea boils down to using EraseMode set to xor, and updating XData and YData of the point for each iteration:

%# coordinates
t = (0:.01:2*pi)';         %# 'fix SO syntax highlight
D = [cos(t) -sin(t)];

%# setup a figure and axis
hFig = figure('Backingstore','off', 'DoubleBuffer','on');
hAx = axes('Parent',hFig, 'XLim',[-1 1], 'YLim',[-1 1], ...
          'Drawmode','fast', 'NextPlot','add');
axis(hAx, 'off','square')

%# draw circular path
line(D(:,1), D(:,2), 'Color',[.3 .3 .3], 'LineWidth',1);

%# initialize point
h = line('XData',D(1,1), 'YData',D(1,2), 'EraseMode','xor',  ...
        'Color','r', 'marker','.', 'MarkerSize',50);
%# init text
hTxt = text(0, 0, num2str(t(1)), 'FontSize',12, 'EraseMode','xor');

i=0;
while true
    i = rem(i+1,numel(t)) + 1;               %# circular increment
    set(h,'XData',D(i,1), 'YData',D(i,2))    %# update X/Y data
    set(hTxt,'String',num2str(t(i)))         %# update angle text
    drawnow                                  %# force refresh
    if ~ishandle(h), return; end             %# in case you close the figure
end

有关使用的参数（ EraseMode ，备份存储， DoubleBuffer <详细解释/ code>，..），请参阅本的动画指南

For a detailed explanation of the parameters used (EraseMode, Backingstore, DoubleBuffer, ..), refer to this animation guide

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