Adding 2D array to 3D array within loop

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John Cruce
John Cruce 2023-8-5
评论： Bruno Luong 2023-8-6
I have a 3d array of zeros size (365,721,1440). I'm iterating through a for loop to add from array (721,1440) to the 3d array for each 1:365. Effectively, I'm wanting to do something like this:
totalarray(i,:,:)=totalarray(i,:,:)+newdata(:,:);
But obviously that throws me an error (Array dimensions must match for binary array op). Any idea how to add this new data I'm creating with each iteration to the total array?
  1 个评论
Stephen23
Stephen23 2023-8-6
移动：Stephen23 2023-8-6
The robust approach avoiding SQUEEZE is to use PERMUTE, e.g. inside the loop:
totalarray(i,:,:) = totalarray(i,:,:) + permute(newdata(:,:),[3,1,2]);

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Torsten
Torsten 2023-8-5
编辑：Torsten 2023-8-5
Ran in:
totalarray = rand(365,721,1440);
newdata = rand(721,1440);
squeeze(totalarray(1,:,:))
ans = 721×1440
0.9180 0.7403 0.9442 0.6863 0.8394 0.5977 0.4434 0.9624 0.6240 0.7789 0.5832 0.5035 0.7979 0.4041 0.5983 0.3894 0.2274 0.2399 0.4560 0.0206 0.4144 0.6171 0.3203 0.0168 0.8789 0.5111 0.8552 0.4301 0.6461 0.6321 0.3525 0.9185 0.0988 0.5666 0.2365 0.2108 0.9625 0.1204 0.2400 0.8816 0.3561 0.6151 0.7968 0.7438 0.2618 0.6526 0.0194 0.4032 0.9423 0.4526 0.7445 0.3585 0.4404 0.9950 0.8167 0.2546 0.8617 0.3610 0.0185 0.5758 0.9099 0.9810 0.0050 0.4039 0.9070 0.7620 0.4528 0.9870 0.2616 0.4812 0.3090 0.8578 0.7012 0.6637 0.2347 0.4635 0.2407 0.8730 0.2824 0.5364 0.9783 0.8739 0.9082 0.3018 0.4118 0.5963 0.6822 0.5497 0.7222 0.2409 0.3404 0.3833 0.1079 0.3026 0.8795 0.7419 0.3381 0.9935 0.2534 0.3623 0.9849 0.8293 0.7670 0.3845 0.8292 0.2274 0.6246 0.7675 0.0875 0.8846 0.7229 0.9455 0.4574 0.2916 0.3537 0.2259 0.7163 0.4403 0.5925 0.4643 0.6796 0.7045 0.9304 0.4964 0.6210 0.7121 0.4238 0.1424 0.6906 0.6048 0.6481 0.9398 0.4049 0.9680 0.3860 0.8715 0.9419 0.8070 0.9225 0.9702 0.0564 0.5348 0.4018 0.1418 0.5718 0.6908 0.2867 0.7117 0.9550 0.3775 0.1733 0.4875 0.7058 0.4508 0.8729 0.5887 0.2104 0.4657 0.5697 0.8856 0.2466 0.1478 0.1918 0.4356 0.3903 0.4003 0.8102 0.7488 0.2213 0.8581 0.2131 0.1030 0.3792 0.1844 0.2401 0.7674 0.7793 0.0751 0.0511 0.0766 0.5268 0.5218 0.8256 0.8983 0.2225 0.4608 0.2592 0.3078 0.1806 0.0341 0.0125 0.7160 0.3720 0.0708 0.5327 0.7104 0.2295 0.4033 0.0143 0.1474 0.4705 0.9806 0.7691 0.7418 0.9536 0.7874 0.3542 0.1520 0.2379 0.2383 0.2001 0.0328 0.2337 0.3656 0.3641 0.6681 0.8772 0.4709 0.3654 0.2162 0.0318 0.2055 0.4044 0.9056 0.8325 0.3972 0.2610 0.6769 0.2282 0.9662 0.0612 0.8916 0.2086 0.3956 0.9327 0.9214 0.4151 0.4498 0.5307 0.4012 0.0485 0.0869 0.7273 0.9606 0.4810 0.1507 0.4744 0.7508 0.2955 0.3601 0.1234 0.0952 0.2242 0.0694 0.2134 0.0094 0.3020 0.3279 0.1929 0.0123 0.9108 0.1594 0.1994 0.0373 0.2910 0.1065 0.9818 0.2966 0.5297 0.6438 0.6840 0.3363 0.2713 0.3576 0.7629 0.2958 0.5539 0.6363 0.1863 0.6901 0.3004 0.1815 0.4398 0.0904 0.5276 0.3253 0.0399 0.4353 0.2279 0.3832 0.7812 0.5513 0.7459 0.2446 0.2601 0.1010 0.7443 0.7047 0.1154 0.9106
newdata
newdata = 721×1440
0.3055 0.9525 0.1939 0.5656 0.3264 0.4077 0.2867 0.1277 0.5417 0.2422 0.8504 0.9468 0.7681 0.7222 0.2938 0.2369 0.3955 0.9816 0.1759 0.6876 0.7899 0.3958 0.7094 0.3803 0.8130 0.1588 0.5729 0.1190 0.7107 0.0030 0.7729 0.7734 0.5378 0.1872 0.7650 0.7394 0.6198 0.8529 0.5647 0.4154 0.4782 0.8490 0.6765 0.5201 0.1543 0.8161 0.2849 0.8946 0.4749 0.2000 0.0452 0.4117 0.3485 0.5924 0.4287 0.2122 0.9401 0.2599 0.8172 0.8658 0.6798 0.8855 0.3265 0.2858 0.0643 0.3721 0.2426 0.4622 0.0092 0.4493 0.0270 0.8284 0.1620 0.8471 0.5345 0.2865 0.4786 0.2376 0.7596 0.4692 0.0854 0.4451 0.3848 0.2226 0.0683 0.8597 0.6666 0.9165 0.9614 0.1105 0.5993 0.9617 0.5919 0.0541 0.0755 0.3134 0.9879 0.8500 0.7821 0.4782 0.9411 0.2385 0.1511 0.4519 0.4333 0.8353 0.4779 0.8709 0.0190 0.0670 0.6135 0.0584 0.5449 0.1919 0.7425 0.1847 0.2467 0.8357 0.1343 0.6207 0.4026 0.3645 0.8392 0.0831 0.9765 0.8641 0.0740 0.2607 0.7417 0.9087 0.8713 0.7614 0.0320 0.9100 0.6449 0.5718 0.7865 0.9480 0.9700 0.2585 0.2334 0.9652 0.3249 0.8944 0.0340 0.0967 0.4310 0.8865 0.3138 0.6828 0.4058 0.8199 0.3658 0.2186 0.7358 0.8380 0.4910 0.7623 0.6318 0.1847 0.2507 0.2270 0.7121 0.1699 0.0554 0.1013 0.7941 0.2391 0.1909 0.1481 0.8970 0.7278 0.3771 0.1150 0.2383 0.5073 0.8240 0.8893 0.1994 0.6386 0.2944 0.3914 0.3253 0.4870 0.8307 0.2496 0.7897 0.4705 0.9255 0.9174 0.0917 0.9445 0.4681 0.3413 0.5292 0.8798 0.9710 0.8278 0.6057 0.9887 0.2685 0.6637 0.9822 0.5773 0.8273 0.1851 0.6225 0.5118 0.0222 0.5489 0.7444 0.7727 0.0729 0.2738 0.7131 0.0560 0.7964 0.8715 0.8032 0.8399 0.6415 0.7498 0.6395 0.3618 0.9688 0.5533 0.1456 0.1894 0.8611 0.4335 0.1508 0.5761 0.7659 0.0973 0.2885 0.7930 0.3601 0.5473 0.2266 0.0614 0.9997 0.9776 0.1400 0.0641 0.8306 0.5158 0.6687 0.4564 0.2149 0.5413 0.9368 0.5342 0.5678 0.6941 0.1299 0.2821 0.2538 0.5806 0.2616 0.7413 0.1544 0.8241 0.6549 0.8108 0.6849 0.6357 0.1402 0.3796 0.5517 0.7123 0.9054 0.4918 0.4470 0.6017 0.7618 0.5326 0.0907 0.8633 0.7658 0.2938 0.1662 0.6496 0.2920 0.4888 0.4386 0.4805 0.6625 0.9880 0.9101 0.7173 0.6183 0.6784 0.8134 0.0029 0.5616 0.3775 0.9112 0.7606 0.1493 0.3026
for i = 1:365
totalarray(i,:,:)=squeeze(totalarray(i,:,:))+newdata(:,:);
end
squeeze(totalarray(1,:,:))-newdata
ans = 721×1440
0.9180 0.7403 0.9442 0.6863 0.8394 0.5977 0.4434 0.9624 0.6240 0.7789 0.5832 0.5035 0.7979 0.4041 0.5983 0.3894 0.2274 0.2399 0.4560 0.0206 0.4144 0.6171 0.3203 0.0168 0.8789 0.5111 0.8552 0.4301 0.6461 0.6321 0.3525 0.9185 0.0988 0.5666 0.2365 0.2108 0.9625 0.1204 0.2400 0.8816 0.3561 0.6151 0.7968 0.7438 0.2618 0.6526 0.0194 0.4032 0.9423 0.4526 0.7445 0.3585 0.4404 0.9950 0.8167 0.2546 0.8617 0.3610 0.0185 0.5758 0.9099 0.9810 0.0050 0.4039 0.9070 0.7620 0.4528 0.9870 0.2616 0.4812 0.3090 0.8578 0.7012 0.6637 0.2347 0.4635 0.2407 0.8730 0.2824 0.5364 0.9783 0.8739 0.9082 0.3018 0.4118 0.5963 0.6822 0.5497 0.7222 0.2409 0.3404 0.3833 0.1079 0.3026 0.8795 0.7419 0.3381 0.9935 0.2534 0.3623 0.9849 0.8293 0.7670 0.3845 0.8292 0.2274 0.6246 0.7675 0.0875 0.8846 0.7229 0.9455 0.4574 0.2916 0.3537 0.2259 0.7163 0.4403 0.5925 0.4643 0.6796 0.7045 0.9304 0.4964 0.6210 0.7121 0.4238 0.1424 0.6906 0.6048 0.6481 0.9398 0.4049 0.9680 0.3860 0.8715 0.9419 0.8070 0.9225 0.9702 0.0564 0.5348 0.4018 0.1418 0.5718 0.6908 0.2867 0.7117 0.9550 0.3775 0.1733 0.4875 0.7058 0.4508 0.8729 0.5887 0.2104 0.4657 0.5697 0.8856 0.2466 0.1478 0.1918 0.4356 0.3903 0.4003 0.8102 0.7488 0.2213 0.8581 0.2131 0.1030 0.3792 0.1844 0.2401 0.7674 0.7793 0.0751 0.0511 0.0766 0.5268 0.5218 0.8256 0.8983 0.2225 0.4608 0.2592 0.3078 0.1806 0.0341 0.0125 0.7160 0.3720 0.0708 0.5327 0.7104 0.2295 0.4033 0.0143 0.1474 0.4705 0.9806 0.7691 0.7418 0.9536 0.7874 0.3542 0.1520 0.2379 0.2383 0.2001 0.0328 0.2337 0.3656 0.3641 0.6681 0.8772 0.4709 0.3654 0.2162 0.0318 0.2055 0.4044 0.9056 0.8325 0.3972 0.2610 0.6769 0.2282 0.9662 0.0612 0.8916 0.2086 0.3956 0.9327 0.9214 0.4151 0.4498 0.5307 0.4012 0.0485 0.0869 0.7273 0.9606 0.4810 0.1507 0.4744 0.7508 0.2955 0.3601 0.1234 0.0952 0.2242 0.0694 0.2134 0.0094 0.3020 0.3279 0.1929 0.0123 0.9108 0.1594 0.1994 0.0373 0.2910 0.1065 0.9818 0.2966 0.5297 0.6438 0.6840 0.3363 0.2713 0.3576 0.7629 0.2958 0.5539 0.6363 0.1863 0.6901 0.3004 0.1815 0.4398 0.0904 0.5276 0.3253 0.0399 0.4353 0.2279 0.3832 0.7812 0.5513 0.7459 0.2446 0.2601 0.1010 0.7443 0.7047 0.1154 0.9106
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Bruno Luong
Bruno Luong 2023-8-6
Ran in:
But
allowedassgn = @(lhs,rhs) isequal(size(squeeze(lhs)), size(rhs)) || ...
(isvector(lhs) && isvector(rhs) && length(lhs)==length(rhs)) || ...
(isempty(rhs) && isempty(lhs));
fails to detect
M = zeros(3,4,5);
v=rand(1,4,5);
allowedassgn(M(1,:,:),v)
ans = logical
0
M(1,:,:)=v; % But this works
Bruno Luong
Bruno Luong 2023-8-6
I think I'll ask in a separete question to get more visible to others

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