如何在Matlab中绘制单元格阵列

Question

我正在Matlab中建立SIR疾病传播模型，我有一个网格，它是一个单元格阵列，每个单元格表示一个状态（s，i，r） 。

我想以s为蓝点， i为红点来绘制网格，并且轴取length(Grid) 。

Grid = 

     []     []    's'    's'     []     []     []    'i'     []     []
    's'     []    's'    's'     []     []     []     []    's'     []
     []     []     []     []     []     []     []     []    's'     []
     []     []     []    's'     []     []     []     []     []     []
     []    's'     []    'i'    's'     []    's'    'i'     []    's'
     []     []    's'    's'     []    's'     []    'i'    's'    'i'
    'i'     []     []     []    's'     []     []     []     []     []
     []     []     []    's'     []     []     []     []     []     []
     []    's'     []     []     []     []    'i'    'i'    'i'     []
     []     []    's'     []    's'    's'     []     []     []     []

Answer 1

您可以使用ismember查找每个标签在单元格数组中的位置。 第二个输出将提供标签的索引。 然后，可以将imagesc与自定义颜色图一起使用以显示结果。

% Create a copy of Grid where the empty cells are replaced with ''
tmp = Grid;
tmp = cellfun(@(x)['' x], Grid, 'UniformOutput', false);

% Locate all of the 's' and 'i' cells and assign values of 1 and 2 respectively
[~, labels] = ismember(tmp, {'s', 'i'});

% Display the resulting label matrix
imagesc(labels)

% Use a custom colormap where empty cells are black, 's' are blue and 'i' are red
cmap = [0 0 0; 0 0 1; 1 0 0];
colormap(cmap)

如果我们使用Grid = {'s', []; 'i', []} Grid = {'s', []; 'i', []}

如果您想要实际的点，则可以执行以下操作：

colors = {'r', 'b'};
labels = {'s', 'i'};

for k = 1:numel(labels)
    % Find the row/column indices of the matches
    [r, c] = find(cellfun(@(x)isequal(x, labels{k}), Grid));

    % Plot these at points using the specified color        
    plot(c, r, '.', 'Color', colors{k}, 'MarkerSize', 20);
    hold on
end