Remove empty rows from matrix

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BOB
BOB 2018-9-17
评论： Voss 2022-11-23
Hi folks,
I have the following matrix:
0.6857 0.1248 0.9636 1.0884 0.4807 0.6077 0.3644 0 0 0
0.9093 1.0006 1.0006 1.0006 1.0006 0.3702 0 0 0 0
0.6367 1.0106 0.5669 0.4437 1.0106 1.0106 0.4608 0 0 0
0.2100 0.3250 1.1000 0.9750 0.1250 1.1000 0.4070 0 0 0
0.2048 0.4401 0.7116 1.1518 0.1521 0.2741 0 0 0 0
0.5575 0.2119 1.2212 0.3091 0.9121 0.8300 0.0993 0 0 0
0.6041 1.0239 0.6050 0.4189 1.0239 0.3428 0 0 0 0
0.5817 1.0205 0.4559 0.5645 1.0205 0.3417 0 0 0 0
0.9277 1.0209 0.5690 0.4519 1.0209 1.0209 0.4390 0 0 0
0.1817 1.0217 0.7974 0.2243 0.4393 0 0 0 0 0
0.4787 0.9174 0.2224 1.1398 0.7216 0.4182 0.3816 0 0 0
0.9091 1.0004 1.0004 1.0004 1.0004 0.5803 0 0 0 0
0.2126 1.0104 0.1849 1.1953 0.4451 0.2482 0 0 0 0
0.2531 0.2652 1.0657 1.0657 0.4962 0.5695 0.7034 0 0 0
0.2072 0.8844 0.2805 1.1650 0.5038 0.2651 0 0 0 0
0.3229 1.0774 0.0362 1.1136 1.1136 0.0092 0.3636 0 0 0
0.2172 1.2212 0.0671 1.1541 0.5882 0.2788 0 0 0 0
0.3084 1.0633 1.0633 0.3386 0.4706 0 0 0 0 0
0.2108 1.0037 1.0037 1.0037 0.3361 0 0 0 0 0
0.1521 0.0784 1.0078 1.0862 0.4669 0.6193 0.3637 0 0 0
0.9111 1.0026 1.0026 1.0026 1.0026 0.8622 0 0 0 0
0.1406 1.0046 1.0046 1.0046 1.0046 1.0046 1.0046 0.5075 0 0
0.1918 0.0487 1.0297 1.0784 0.5640 0.3634 0 0 0 0
0.1513 0.0229 1.2441 0.4140 0.8301 0.8509 0.0958 0 0 0
0.8749 1.0001 1.0001 0.0422 0 0 0 0 0 0
0.8900 1.0173 0.5089 0.5084 1.0173 1.0173 0.5565 0 0 0
0.8903 1.0177 0.7745 0 0 0 0 0 0 0
1.0498 0.0125 1.2351 0.4561 0.7790 0.4136 0 0 0 0
1.0150 0.7605 0.4198 0.8982 0 0 0 0 0 0
0.1808 1.0165 1.0165 1.0165 0.1931 0 0 0 0 0
0.8158 1.0071 0.2857 0.4807 0 0 0 0 0 0
0.8973 0.2251 0.9714 0.8502 0.3462 0.4006 0 0 0 0
0.2134 1.2000 0.1495 1.0506 0.7584 0.4417 0.3000 0 0 0
0.7503 1.0005 1.0005 1.0005 1.0005 0.5472 0 0 0 0
0.8519 1.1359 0.0001 0.8643 0 0 0 0 0 0
0.7315 0.4265 0.7546 0.3955 0 0 0 0 0 0
0.6675 0.8202 0 0 0 0 0 0 0 0
0.3814 1.0037 1.0037 1.0037 0.5490 0 0 0 0 0
0.3608 1.0934 0.0694 0.2967 0 0 0 0 0 0
0.1815 1.0204 1.0204 1.0204 1.0204 0.0804 0.6033 0 0 0
0.3523 1.0676 1.0676 0.0248 1.0429 0.5840 0 0 0 0
0.3721 0.6114 0.6717 0.4296 0 0 0 0 0 0
0.1866 1.0493 1.0493 0.5664 0.4830 1.0493 0.7450 0 0 0
0.2975 1.0260 0.0635 0.9624 1.0260 0.5612 0 0 0 0
0.3385 0.8884 0 0 0 0 0 0 0 0
0.2690 0.8727 0.3151 0.3977 0 0 0 0 0 0
0.2374 1.0482 0.7679 0.2802 1.0482 0.5733 0 0 0 0
0.1428 1.0986 0.2470 0.1208 0 0 0 0 0 0
0.1407 1.0821 1.0821 0.1822 0.8999 0.5919 0 0 0 0
0.1300 0.7610 0 0 0 0 0 0 0 0
0.9675 0.0053 0.4343 0 0 0 0 0 0 0
0.1817 1.0220 1.0220 1.0220 0.9418 0.0802 1.0220 0.2555 0 0
0.8054 1.0738 0.0971 0.9767 0.5874 0 0 0 0 0
0.7961 0.2463 0.5288 0 0 0 0 0 0 0
0.6895 0.6923 0.3524 1.0447 0.5715 0 0 0 0 0
0.6871 0 0 0 0 0 0 0 0 0
0.9155 0 0 0 0 0 0 0 0 0
0.4147 0 0 0 0 0 0 0 0 0
0.7308 0.0113 1.1596 0.8044 0.3522 0 0 0 0 0
0.6601 0.3453 0 0 0 0 0 0 0 0
0.5076 0.0782 0 0 0 0 0 0 0 0
0.7649 0.2744 0.5651 0 0 0 0 0 0 0
0.6115 0.3237 0.1214 0 0 0 0 0 0 0
0.7236 0.0776 0.6387 0 0 0 0 0 0 0
0.5311 0.1151 0.9963 0 0 0 0 0 0 0
0.1641 0.0599 0.9660 1.0259 0.5612 0 0 0 0 0
0.8965 0 0 0 0 0 0 0 0 0
0.6188 1.0043 0.1607 0 0 0 0 0 0 0
0.4533 0.3284 0.9263 0 0 0 0 0 0 0
0.3628 0.4568 0.4365 0 0 0 0 0 0 0
0.2558 0.5884 0 0 0 0 0 0 0 0
0.1884 0.4902 0 0 0 0 0 0 0 0
0.1455 0.0447 0.5526 0 0 0 0 0 0 0
0.0793 0.3838 0 0 0 0 0 0 0 0
0.0805 1.0149 0.6064 0 0 0 0 0 0 0
0.7523 0.8290 0.2982 1.1272 0.5694 0 0 0 0 0
0.1034 0.9373 0.3661 1.1931 0.1102 0.7427 0 0 0 0
0.0888 0.4431 0.6763 0.0638 0 0 0 0 0 0
0.0670 0.3839 0 0 0 0 0 0 0 0
0.0681 1.0164 0.6073 0 0 0 0 0 0 0
0.0755 0.4427 0.6843 0.0642 0 0 0 0 0 0
0.5619 0.4598 0.6869 1.1467 0.2045 0 0 0 0 0
0.4987 0.3906 0 0 0 0 0 0 0 0
0.5430 0.0114 1.0968 0.0632 0 0 0 0 0 0
0.4407 0.4027 0 0 0 0 0 0 0 0
0.4495 1.0963 0.2350 0.8613 0.5538 0 0 0 0 0
0.5038 0.4028 0 0 0 0 0 0 0 0
0.4943 0.0541 1.1424 0.0651 0 0 0 0 0 0
0.6954 0.4171 0 0 0 0 0 0 0 0
0.4677 0.2769 1.1634 0.0663 0 0 0 0 0 0
0.1589 1.1350 0.2493 0.8856 0.5733 0 0 0 0 0
0.3814 0.0163 1.2831 0.0731 0 0 0 0 0 0
0.6389 1.0369 0.4251 0 0 0 0 0 0 0
0.0710 1.0149 0.5551 0 0 0 0 0 0 0
0.4376 0.6881 1.0147 0 0 0 0 0 0 0
0.6393 1.1416 0.2036 0 0 0 0 0 0 0
0.3888 1.0800 0.1926 0 0 0 0 0 0 0
0.6852 0.3812 0 0 0 0 0 0 0 0
0.4217 0.7882 0.3831 0.6674 0 0 0 0 0 0
0.2469 1.0330 0.1550 0.2272 0 0 0 0 0 0
0.6003 0.1677 0.6004 0 0 0 0 0 0 0
0.3019 0.1893 1.0737 0.5634 0.0933 0 0 0 0 0
0.8692 0.1094 0.5962 0 0 0 0 0 0 0
0.3294 0.5862 0.7919 0.6614 0.0828 0 0 0 0 0
0.3616 1.1205 0.0095 0.5708 0 0 0 0 0 0
0.9761 0.2160 0.9891 0.4625 0 0 0 0 0 0
0.1902 1.0011 0.5057 0 0 0 0 0 0 0
0.2418 1.0338 1.0338 0.5295 0 0 0 0 0 0
0.2351 1.0051 0.1556 0.8495 0.4699 0 0 0 0 0
0.2517 1.0759 1.0233 0.0526 0.5968 0 0 0 0 0
0.2342 1.0014 1.0014 0.4238 0 0 0 0 0 0
0.2430 1.0389 0.9815 0.0574 0.4320 0 0 0 0 0
0.2707 0.5728 0.5845 1.1573 0.2449 0.2636 0 0 0 0
0.1065 0.1941 1.2852 0.1126 1.1726 0.4194 0.2113 0 0 0
0.5830 0.5932 0 0 0 0 0 0 0 0
0.4807 0.7002 0.5100 1.2102 0.0551 0.4094 0 0 0 0
0.8563 0.0122 0.5702 0 0 0 0 0 0 0
0.1487 0.9660 0.3856 0.3652 0 0 0 0 0 0
0.7246 0.1034 0.4980 0 0 0 0 0 0 0
0.2777 0.7889 0.3046 0 0 0 0 0 0 0
Columns 11 through 20
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
I want to remove all the rows which are all zeros.
Thanks

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采纳的回答

Star Strider
Star Strider 2018-9-17
If ‘M’ is your matrix, this works:
M = M(~all(M == 0, 2),:);
It will remove the ‘all zero’ rows using ‘logical indexing’.
  4 个评论
显示 2更早的评论
Thiago de Aquino Costa Sousa
Thiago de Aquino Costa Sousa 2022-11-23
And what if, instead of 0 I have empty [] cells??? How can I remove them?
Voss
Voss 2022-11-23
Ran in:
@Thiago de Aquino Costa Sousa: If you have a cell array (not a matrix as in the question) and you want to remove those rows whose elements all contain the empty array [], then you can do this:
% a cell array with some cells containing empty arrays []:
C = {1 [] 3; [] [] []; [7 8] [] []}
C = 3×3 cell array
{[ 1]} {0×0 double} {[ 3]} {0×0 double} {0×0 double} {0×0 double} {[ 7 8]} {0×0 double} {0×0 double}
C = C(~all(cellfun(@isempty,C),2),:)
C = 2×3 cell array
{[ 1]} {0×0 double} {[ 3]} {[7 8]} {0×0 double} {0×0 double}

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