我有一个类似于此的结构数组：
AAA(1).Size = rand(1,10);
AAA(2).Size = rand(1,10);
AAA(...).Size = rand(1,10);
...
我有一个像这样的矩阵：
mMatrix = [rand(1,100); rand(1,100); ...]
如何在一次调用中将mMatrix的行值分配到AAA（此处称为NumberOfElement）中的新结构，而不必使用循环？
nRow = size(mMatrix, 1);
for ii = 1:nRow
AAA(ii).NumberOfElement = mMatrix(ii,:);
end
此外，可以在AAA中为多个矩阵和多个新结构执行此操作，例如：
nRow = size(mMatrixDataset1, 1); % The matrices have the same number of rows
for ii = 1:nRow
AAA(ii).NumberOfElementDataset1 = mMatrixDataset1(ii,:);
AAA(ii).NumberOfElementDataset2 = mMatrixDataset2(ii,:);
AAA(ii).NumberOfElementDataset3 = mMatrixDataset3(ii,:);
...
end
答案 0 :(得分：3)
您可以将矩阵mMatrix拆分为多个单元格，其中每个单元格都是矩阵的一行。我们可以使用mat2cell执行此操作，然后使用单个展开调用分配给结构中的每个元素。无论先前是否已声明结构，这都将起作用。因此：
c = mat2cell(mMatrix, ones(size(mMatrix,1),1), size(mMatrix, 2));
[AAA(1:size(mMatrix,1)).NumberOfElement] = c{:};
%// Set up code
mMatrix = rand(4, 100);
%// Code I wrote above
c = mat2cell(mMatrix, ones(size(mMatrix,1),1), size(mMatrix, 2));
[AAA(1:size(mMatrix,1)).NumberOfElement] = c{:};
AAA =
1x4 struct array with fields:
NumberOfElement
我们可以使用for循环遍历每个结构，以显示每个NumberOfElement字段的外观：
for ii = 1 : size(mMatrix, 1)
disp(['Structure ' num2str(ii)]);
disp(['Row ' num2str(ii) ' of matrix']);
disp(mMatrix(ii,:));
disp('Structure contents')
disp(AAA(ii).NumberOfElement);
end
上面的代码显示了mMatrix中存储的矩阵的每一行，以及结构中每个元素的实际字段。
我明白了：
Structure 1
Row 1 of matrix
Columns 1 through 8
0.4229 0.6959 0.0688 0.4076 0.5313 0.7788 0.1537 0.4574
Columns 9 through 16
0.6377 0.2891 0.2548 0.3445 0.6022 0.4624 0.3225 0.1759
Columns 17 through 24
0.3411 0.2428 0.1887 0.6834 0.6476 0.2089 0.6073 0.7703
Columns 25 through 32
0.8419 0.5822 0.3181 0.4795 0.5439 0.2187 0.4046 0.6279
Columns 33 through 40
0.1920 0.5254 0.3935 0.3477 0.0445 0.6878 0.6834 0.3309
Columns 41 through 48
0.8217 0.7691 0.3774 0.3276 0.7689 0.5144 0.1999 0.7900
Columns 49 through 56
0.1117 0.1897 0.8507 0.5828 0.0005 0.5277 0.4981 0.7386
Columns 57 through 64
0.0835 0.8908 0.9283 0.8627 0.5523 0.3624 0.1231 0.0427
Columns 65 through 72
0.6952 0.1239 0.2703 0.4170 0.1057 0.5737 0.7378 0.9844
Columns 73 through 80
0.1776 0.9391 0.4671 0.5590 0.0542 0.8985 0.7069 0.4648
Columns 81 through 88
0.1781 0.3358 0.6754 0.7455 0.5972 0.8949 0.4417 0.0934
Columns 89 through 96
0.9954 0.2982 0.6311 0.9051 0.3381 0.0484 0.7297 0.6925
Columns 97 through 100
0.7802 0.1048 0.8905 0.0729
Structure contents
Columns 1 through 8
0.4229 0.6959 0.0688 0.4076 0.5313 0.7788 0.1537 0.4574
Columns 9 through 16
0.6377 0.2891 0.2548 0.3445 0.6022 0.4624 0.3225 0.1759
Columns 17 through 24
0.3411 0.2428 0.1887 0.6834 0.6476 0.2089 0.6073 0.7703
Columns 25 through 32
0.8419 0.5822 0.3181 0.4795 0.5439 0.2187 0.4046 0.6279
Columns 33 through 40
0.1920 0.5254 0.3935 0.3477 0.0445 0.6878 0.6834 0.3309
Columns 41 through 48
0.8217 0.7691 0.3774 0.3276 0.7689 0.5144 0.1999 0.7900
Columns 49 through 56
0.1117 0.1897 0.8507 0.5828 0.0005 0.5277 0.4981 0.7386
Columns 57 through 64
0.0835 0.8908 0.9283 0.8627 0.5523 0.3624 0.1231 0.0427
Columns 65 through 72
0.6952 0.1239 0.2703 0.4170 0.1057 0.5737 0.7378 0.9844
Columns 73 through 80
0.1776 0.9391 0.4671 0.5590 0.0542 0.8985 0.7069 0.4648
Columns 81 through 88
0.1781 0.3358 0.6754 0.7455 0.5972 0.8949 0.4417 0.0934
Columns 89 through 96
0.9954 0.2982 0.6311 0.9051 0.3381 0.0484 0.7297 0.6925
Columns 97 through 100
0.7802 0.1048 0.8905 0.0729
Structure 2
Row 2 of matrix
Columns 1 through 8
0.0942 0.6999 0.3196 0.8200 0.3251 0.4235 0.2810 0.8754
Columns 9 through 16
0.9577 0.6718 0.2240 0.7805 0.3868 0.4243 0.7847 0.7218
Columns 17 through 24
0.6074 0.9174 0.2875 0.5466 0.6790 0.7093 0.4501 0.3502
Columns 25 through 32
0.8329 0.5407 0.1192 0.6393 0.7210 0.1058 0.4484 0.7720
Columns 33 through 40
0.1389 0.5303 0.6714 0.1500 0.7549 0.3592 0.7040 0.4243
Columns 41 through 48
0.4299 0.3968 0.2160 0.6713 0.1673 0.8843 0.4070 0.3185
Columns 49 through 56
0.1363 0.4950 0.5606 0.8154 0.8654 0.4795 0.9009 0.5860
Columns 57 through 64
0.6260 0.9823 0.5801 0.4843 0.6299 0.0495 0.2055 0.6352
Columns 65 through 72
0.4991 0.4904 0.2085 0.2060 0.1420 0.0521 0.0634 0.8589
Columns 73 through 80
0.3986 0.3013 0.6482 0.8541 0.1771 0.1182 0.9995 0.7640
Columns 81 through 88
0.3596 0.1757 0.4685 0.7363 0.2999 0.0715 0.0133 0.3074
Columns 89 through 96
0.3321 0.0464 0.0899 0.5338 0.2940 0.6679 0.7073 0.5567
Columns 97 through 100
0.3376 0.1279 0.7990 0.0885
Structure contents
Columns 1 through 8
0.0942 0.6999 0.3196 0.8200 0.3251 0.4235 0.2810 0.8754
Columns 9 through 16
0.9577 0.6718 0.2240 0.7805 0.3868 0.4243 0.7847 0.7218
Columns 17 through 24
0.6074 0.9174 0.2875 0.5466 0.6790 0.7093 0.4501 0.3502
Columns 25 through 32
0.8329 0.5407 0.1192 0.6393 0.7210 0.1058 0.4484 0.7720
Columns 33 through 40
0.1389 0.5303 0.6714 0.1500 0.7549 0.3592 0.7040 0.4243
Columns 41 through 48
0.4299 0.3968 0.2160 0.6713 0.1673 0.8843 0.4070 0.3185
Columns 49 through 56
0.1363 0.4950 0.5606 0.8154 0.8654 0.4795 0.9009 0.5860
Columns 57 through 64
0.6260 0.9823 0.5801 0.4843 0.6299 0.0495 0.2055 0.6352
Columns 65 through 72
0.4991 0.4904 0.2085 0.2060 0.1420 0.0521 0.0634 0.8589
Columns 73 through 80
0.3986 0.3013 0.6482 0.8541 0.1771 0.1182 0.9995 0.7640
Columns 81 through 88
0.3596 0.1757 0.4685 0.7363 0.2999 0.0715 0.0133 0.3074
Columns 89 through 96
0.3321 0.0464 0.0899 0.5338 0.2940 0.6679 0.7073 0.5567
Columns 97 through 100
0.3376 0.1279 0.7990 0.0885
Structure 3
Row 3 of matrix
Columns 1 through 8
0.5985 0.6385 0.5309 0.7184 0.1056 0.0908 0.4401 0.5181
Columns 9 through 16
0.2407 0.6951 0.6678 0.6753 0.9160 0.4609 0.4714 0.4735
Columns 17 through 24
0.1917 0.2691 0.0911 0.4257 0.6358 0.2362 0.4587 0.6620
Columns 25 through 32
0.2564 0.8699 0.9398 0.5447 0.5225 0.1097 0.3658 0.9329
Columns 33 through 40
0.6963 0.8611 0.7413 0.5861 0.2428 0.7363 0.4423 0.2703
Columns 41 through 48
0.8878 0.8085 0.7904 0.4386 0.8620 0.5880 0.7487 0.5341
Columns 49 through 56
0.6787 0.1476 0.9296 0.8790 0.6126 0.8013 0.5747 0.2467
Columns 57 through 64
0.6609 0.7690 0.0170 0.8449 0.0320 0.4896 0.1465 0.2819
Columns 65 through 72
0.5358 0.8530 0.5650 0.9479 0.1665 0.9312 0.8604 0.7856
Columns 73 through 80
0.1339 0.2955 0.0252 0.3479 0.6628 0.9884 0.2878 0.8182
Columns 81 through 88
0.0567 0.2089 0.9121 0.5619 0.1341 0.2425 0.8972 0.4561
Columns 89 through 96
0.2973 0.5054 0.0809 0.1092 0.7463 0.6035 0.7814 0.3965
Columns 97 through 100
0.6079 0.5495 0.7343 0.7984
Structure contents
Columns 1 through 8
0.5985 0.6385 0.5309 0.7184 0.1056 0.0908 0.4401 0.5181
Columns 9 through 16
0.2407 0.6951 0.6678 0.6753 0.9160 0.4609 0.4714 0.4735
Columns 17 through 24
0.1917 0.2691 0.0911 0.4257 0.6358 0.2362 0.4587 0.6620
Columns 25 through 32
0.2564 0.8699 0.9398 0.5447 0.5225 0.1097 0.3658 0.9329
Columns 33 through 40
0.6963 0.8611 0.7413 0.5861 0.2428 0.7363 0.4423 0.2703
Columns 41 through 48
0.8878 0.8085 0.7904 0.4386 0.8620 0.5880 0.7487 0.5341
Columns 49 through 56
0.6787 0.1476 0.9296 0.8790 0.6126 0.8013 0.5747 0.2467
Columns 57 through 64
0.6609 0.7690 0.0170 0.8449 0.0320 0.4896 0.1465 0.2819
Columns 65 through 72
0.5358 0.8530 0.5650 0.9479 0.1665 0.9312 0.8604 0.7856
Columns 73 through 80
0.1339 0.2955 0.0252 0.3479 0.6628 0.9884 0.2878 0.8182
Columns 81 through 88
0.0567 0.2089 0.9121 0.5619 0.1341 0.2425 0.8972 0.4561
Columns 89 through 96
0.2973 0.5054 0.0809 0.1092 0.7463 0.6035 0.7814 0.3965
Columns 97 through 100
0.6079 0.5495 0.7343 0.7984
Structure 4
Row 4 of matrix
Columns 1 through 8
0.4709 0.0336 0.6544 0.9686 0.6110 0.2665 0.5271 0.9436
Columns 9 through 16
0.6761 0.0680 0.8444 0.0067 0.0012 0.7702 0.0358 0.1527
Columns 17 through 24
0.7384 0.7655 0.5762 0.6444 0.9452 0.1194 0.6619 0.4162
Columns 25 through 32
0.6135 0.2648 0.6456 0.6473 0.9937 0.0636 0.7635 0.9727
Columns 33 through 40
0.0938 0.4849 0.5201 0.2621 0.4424 0.3947 0.0196 0.1971
Columns 41 through 48
0.3912 0.7551 0.9493 0.8335 0.9899 0.1548 0.8256 0.0900
Columns 49 through 56
0.4952 0.0550 0.6967 0.9889 0.9900 0.2278 0.8452 0.6664
Columns 57 through 64
0.7298 0.5814 0.1209 0.2094 0.6147 0.1925 0.1891 0.5386
Columns 65 through 72
0.4452 0.8739 0.6403 0.0821 0.6210 0.7287 0.9344 0.5134
Columns 73 through 80
0.0309 0.3329 0.8422 0.4460 0.3308 0.5400 0.4145 0.1002
Columns 81 through 88
0.5219 0.9052 0.1040 0.1842 0.2126 0.0538 0.1967 0.1017
Columns 89 through 96
0.0620 0.7614 0.7772 0.8258 0.0103 0.5261 0.2880 0.0616
Columns 97 through 100
0.7413 0.4852 0.0513 0.9430
Structure contents
Columns 1 through 8
0.4709 0.0336 0.6544 0.9686 0.6110 0.2665 0.5271 0.9436
Columns 9 through 16
0.6761 0.0680 0.8444 0.0067 0.0012 0.7702 0.0358 0.1527
Columns 17 through 24
0.7384 0.7655 0.5762 0.6444 0.9452 0.1194 0.6619 0.4162
Columns 25 through 32
0.6135 0.2648 0.6456 0.6473 0.9937 0.0636 0.7635 0.9727
Columns 33 through 40
0.0938 0.4849 0.5201 0.2621 0.4424 0.3947 0.0196 0.1971
Columns 41 through 48
0.3912 0.7551 0.9493 0.8335 0.9899 0.1548 0.8256 0.0900
Columns 49 through 56
0.4952 0.0550 0.6967 0.9889 0.9900 0.2278 0.8452 0.6664
Columns 57 through 64
0.7298 0.5814 0.1209 0.2094 0.6147 0.1925 0.1891 0.5386
Columns 65 through 72
0.4452 0.8739 0.6403 0.0821 0.6210 0.7287 0.9344 0.5134
Columns 73 through 80
0.0309 0.3329 0.8422 0.4460 0.3308 0.5400 0.4145 0.1002
Columns 81 through 88
0.5219 0.9052 0.1040 0.1842 0.2126 0.0538 0.1967 0.1017
Columns 89 through 96
0.0620 0.7614 0.7772 0.8258 0.0103 0.5261 0.2880 0.0616
Columns 97 through 100
0.7413 0.4852 0.0513 0.9430
答案 1 :(得分：2)
这似乎适用于multiple matrices and multiple new structures使用cell2struct -
num_matrices = 3; %// Number of matrices to be used
fnames = {'set1','set2','set3'} %// Fieldnames for each matrix
M = cat(1,mat1,mat2,mat3) %// Concatenate all matrices into a single one
%// Form cell array version of the concatenated array and then the struct
C = reshape(mat2cell(M,ones(1,size(M,1)),size(M,2)),size(mat1,1),[])
%// Finally create the struct
AAA = cell2struct(C,fnames,2)
示例输入和输出 -
>> mat1
mat1 =
0.2232 0.9404 0.3981 0.6934 0.5052 0.6516 0.1042
0.5832 0.8867 0.2036 0.5595 0.2792 0.4844 0.9474
0.8316 0.0259 0.5718 0.0322 0.4067 0.9513 0.9229
0.3041 0.2078 0.4503 0.4658 0.2488 0.0533 0.8370
>> AAA.set1
ans =
0.2232 0.9404 0.3981 0.6934 0.5052 0.6516 0.1042
ans =
0.5832 0.8867 0.2036 0.5595 0.2792 0.4844 0.9474
ans =
0.8316 0.0259 0.5718 0.0322 0.4067 0.9513 0.9229
ans =
0.3041 0.2078 0.4503 0.4658 0.2488 0.0533 0.8370
>> mat2
mat2 =
0.1468 0.8309 0.3492 0.5820 0.1021 0.4695 0.5848
0.9706 0.2005 0.5406 0.2961 0.3054 0.7118 0.1053
0.4054 0.6320 0.3319 0.9196 0.8603 0.2329 0.7693
0.8479 0.5877 0.8974 0.0810 0.8876 0.0734 0.5933
>> AAA.set2
ans =
0.1468 0.8309 0.3492 0.5820 0.1021 0.4695 0.5848
ans =
0.9706 0.2005 0.5406 0.2961 0.3054 0.7118 0.1053
ans =
0.4054 0.6320 0.3319 0.9196 0.8603 0.2329 0.7693
ans =
0.8479 0.5877 0.8974 0.0810 0.8876 0.0734 0.5933
等其他矩阵。