MATLAB 中的矩阵数组 [英] Array of Matrices in MATLAB

问题描述

我正在寻找一种方法来在 MATLAB 的数组中存储大量可变数量的矩阵.

I am looking for a way to store a large variable number of matrixes in an array in MATLAB.

有什么方法可以实现吗?

Are there any ways to achieve this?

示例:

for i: 1:unknown
  myArray(i) = zeros(500,800);
end

如果数组的不同长度未知，我可以根据需要修改附加信息.

Where unknown is the varied length of the array, I can revise with additional info if needed.

更新:性能是我试图实现这一目标的主要原因.我之前用过它，它将数据作为单个矩阵抓取，实时显示，然后继续处理下一组数据.

Update: Performance is the main reason I am trying to accomplish this. I had it before where it would grab the data as a single matrix, show it in real time and then proceed to process the next set of data.

我尝试使用 Rocco 在下面建议的多维数组，但是我的数据太大以至于内存不足，我可能不得不为我的案例寻找另一种选择.将在我尝试其他建议时更新.

I attempted it using multidimensional arrays as suggested below by Rocco, however my data is so large that I ran out of Memory, I might have to look into another alternative for my case. Will update as I attempt other suggestions.

更新 2:谢谢大家的建议，但是我应该事先指定，精度和速度在这里都是一个不可或缺的因素，在尝试 3-d 数组之前，我可能不得不考虑回到我原来的方法，并重新评估导入的方法数据.

Update 2: Thank you all for suggestions, however I should have specified beforehand, precision AND speed are both an integral factor here, I may have to look into going back to my original method before trying 3-d arrays and re-evaluate the method for importing the data.

推荐答案

如果所有矩阵的大小都相同(即 500x800)，那么您可以制作一个 3D 数组:

If all of the matrices are going to be the same size (i.e. 500x800), then you can just make a 3D array:

nUnknown;  % The number of unknown arrays
myArray = zeros(500,800,nUnknown);

要访问一个数组，您将使用以下语法:

To access one array, you would use the following syntax:

subMatrix = myArray(:,:,3);  % Gets the third matrix

您可以通过以下几种方式向 myArray 添加更多矩阵:

You can add more matrices to myArray in a couple of ways:

myArray = cat(3,myArray,zeros(500,800));
% OR
myArray(:,:,nUnknown+1) = zeros(500,800);

如果每个矩阵的大小不同，您将需要使用 Hosam 建议的元胞数组.

If each matrix is not going to be the same size, you would need to use cell arrays like Hosam suggested.

我错过了关于内存不足的部分.我猜你的 nUnknown 相当大.您可能需要切换矩阵的数据类型(如果您使用的是整数，则为单个或什至 uintXX 类型).您可以在调用零时执行此操作:

I missed the part about running out of memory. I'm guessing your nUnknown is fairly large. You may have to switch the data type of the matrices (single or even a uintXX type if you are using integers). You can do this in the call to zeros:

myArray = zeros(500,800,nUnknown,'single');

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