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haifisch123
Asked: 2024-07-03 05:30:36 +0800 CST

如何在 bar3 图中更新 ZData？

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我正在尝试更新 bar3 图的 ZData：

z = [[1, 2]; [3, 4]];
z_new = [[1, 2]; [3, 3]];
h = bar3(z);% works fine until here

set(h, 'ZData', z_new);

然后我收到以下错误：

Warning: Error creating or updating Surface
 Error in value of property  ZData
 Array is wrong shape or size 
Warning: Error creating or updating Surface
 Error in value of property  ZData
 Array is wrong shape or size

它们不会使程序崩溃，但现有地块的数据会被删除而不是被覆盖。

我不明白为什么会发生这种情况，因为矩阵显然是相同的大小。

matlab

2 个回答

  1. Best Answer

    我不明白为什么会发生这种情况，因为矩阵显然是相同的大小。

    它们的大小不同。根据提供的参数bar3创建一个自定义ZData条目z。显示ZData条目z=[[1, 2]; [3, 4]];

    h.ZData

ans =

   NaN     0     0   NaN
     0     1     1     0
     0     1     1     0
   NaN     0     0   NaN
   NaN     0     0   NaN
   NaN   NaN   NaN   NaN
   NaN     0     0   NaN
     0     3     3     0
     0     3     3     0
   NaN     0     0   NaN
   NaN     0     0   NaN
   NaN   NaN   NaN   NaN


ans =

   NaN     0     0   NaN
     0     2     2     0
     0     2     2     0
   NaN     0     0   NaN
   NaN     0     0   NaN
   NaN   NaN   NaN   NaN
   NaN     0     0   NaN
     0     4     4     0
     0     4     4     0
   NaN     0     0   NaN
   NaN     0     0   NaN
   NaN   NaN   NaN   NaN

    你可以ZData通过构建上述格式的矩阵并z_new在正确的位置填充数据来进行更新，这样应该可以正常工作。如果你只是想覆盖旧图，最好使用h = bar3(z_new);

    • 1

  2. Pevan 的回答解释了为什么不能ZData使用输入到的相同矩阵直接设置bar3，但这里有一个示例说明如何z_new使用辅助函数来ZData直接设置，而不必重新绘制新bar3对象。

    有关每个步骤的更多详细信息，请参阅评论：

    z = [[1, 2]; [3, 4]];
z_new = [[1, 2]; [3, 3]];
h = bar3(z);% works fine until here

setz3( h, z_new )

function setz3( h, z )
    % Helper function to create and apply the required surface matrices to
    % the surface array which bar3 returns, for changing the z heights
    % using the same syntax as bar3 takes for input
    % First, make a template which contains the correct surface for each
    % bar but just of height 1, then loop to modify each surface
    zz = NaN(6,4);                            % initialise to NaN
    zz([2,3,7,10,11,13,16,17,20,21]) = 0;     % edge points to 0
    zz([8,9,14,15]) = 1;                      % interior points to 1
    for ii = 1:size(z,2)
        zi = zz.*reshape(z(:,ii),1,1,[]);         % scale by bar heights
        zi = reshape(permute(zi,[1,3,2]),[],4,1); % stack all bar heights
        h(ii).ZData = zi;                         % assign to surface
    end
end
    • 0

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