我有一些随机的二维数据fuffalo我保存到文件fuffa=rand(10,10);
save('fuffalo','fuffa', '-v7.3')
：
fuffa然后我经历一个循环，生成其他m1 = matfile('fuffalo.mat', 'Writable', true);
for ii=1:3
fuffa2=rand(10,10);
m1.fuffa(1:10,1:10,end+1)=fuffa2;
end
数据，我想要（在第三维中）附加到已保存的变量。为此，我尝试应用this建议：
ii=2但是，在 > <?xml version="1.0" encoding="UTF-8"?>
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我收到以下错误：
变量'fuffa'在文件中有2个维度，这与索引下标中的3个维度不匹配。
如何说服MATLAB追加第三维？
答案 0 :(得分：1)
因为您正在访问磁盘上的文件而不是工作区变量，所以您可能会遇到扩展维数的问题。处理存储在内存中的变量时，您不会遇到此问题（例如，如果您使用load而不是matfile）。
为避免这种情况，最好的方法是pre-allocation。我将假设这是对您实际问题的简化，并且您需要能够对可能的2D阵列进行此类3D扩展。
在这种情况下，只需使用cat在第三维中连接：
fuffa=rand(10,10);
save('fuffalo','fuffa', '-v7.3')
m1 = matfile('fuffalo.mat', 'Writable', true);
for ii=1:3
fuffa2=rand(10,10);
% Concatenating in the 3rd dimension, avoiding used 'end' which
% assumes that dimension already exists
m1.fuffa=cat(3,m1.fuffa,fuffa2);
end
% m1.fuffa <10x10x4 double>
请注意，通过这样做，您将整个.mat数据带入内存以进行连接，从而使matfile()无效。但是，您之前的方法会遇到同样的问题，因为在docs中我们看到了：
使用
end关键字作为索引的一部分会导致MATLAB将整个变量加载到内存中。
如前所述，预分配你可能会更好！