How can I merge the matrices that produce different dimensions in the loop

Suppose my loop will generate matrices of different dimensions such as the first five matrices

first lap

28.984 30 58.984

28.984 13.943 42.927

28.984 30.082 59.066

28.984 14.959 43.943

28.984 44.025 73.009

2

30 13.943 43.943

30 0.041 30.041

30 27.968 57.968

30 29.066 59.066

30 27.424 57.424

30 57.968 87.968

3

28.44 29.528 57.968

28.44 30.544 58.984

28.44 57.968 86.408

4

15.041 57.968 73.009

15.041 44.025 59.066

15.041 73.009 88.05

5

13.943 30.082 44.025

13.943 0.082 14.025

I want to combine the variables generated in each loop

ex.

28.984 30 58.984

28.984 13.943 42.927

28.984 30.082 59.066

28.984 14.959 43.943

28.984 44.025 73.009

30 13.943 43.943

30 0.041 30.041

30 27.968 57.968

30 29.066 59.066

30 27.424 57.424

30 57.968 87.968

28.44 29.528 57.968

28.44 30.544 58.984

28.44 57.968 86.408

15.041 57.968 73.009

15.041 44.025 59.066

15.041 73.009 88.05

13.943 30.082 44.025

13.943 0.082 14.025

I tried writing directly into a new variable, but each time the length is different and it is overwritten

Answer 1

[Stephen23]

Simply put them all into one cell array and then concatenate after the loop:

N = the number of loop iterations
C = cell(1,N);
for k = 1:N
    .. your code
    C{k} = the matrix you want to store
end
M = vertcat(C{:})

https://www.mathworks.com/help/matlab/matlab_prog/access-data-in-a-cell-array.html

https://www.mathworks.com/help/matlab/matlab_prog/comma-separated-lists.html

https://www.mathworks.com/matlabcentral/answers/1656435-tutorial-comma-separated-lists-and-how-to-use-them

Answer 2

[KALYAN ACHARJYA]

#Example

data_store=cell(5,1)

data_store = 5×1 cell array
    {0×0 double}
    {0×0 double}
    {0×0 double}
    {0×0 double}
    {0×0 double}

for i=1:5
    data=rand(i,3)
    data_store{i}=data;
end 

data = 1×3

0.0183 0.2498 0.3910

data = 2×3

0.4556 0.6126 0.5924 0.6746 0.9996 0.2717

data = 3×3

0.9221 0.4498 0.5734 0.3334 0.2563 0.7197 0.8898 0.4627 0.5413

data = 4×3

0.0941 0.3222 0.2912 0.0120 0.0743 0.3047 0.3163 0.2125 0.2685 0.5703 0.5373 0.7103

data = 5×3

0.8565 0.5857 0.5728 0.5970 0.9831 0.4692 0.1349 0.3714 0.8664 0.6788 0.2480 0.0239 0.8564 0.3289 0.9417

dat=cell2mat(data_store)

dat = 15×3

0.0183 0.2498 0.3910 0.4556 0.6126 0.5924 0.6746 0.9996 0.2717 0.9221 0.4498 0.5734 0.3334 0.2563 0.7197 0.8898 0.4627 0.5413 0.0941 0.3222 0.2912 0.0120 0.0743 0.3047 0.3163 0.2125 0.2685 0.5703 0.5373 0.7103

Answer 3

[VBBV]

Use [ ] inside the loop

for k = 1:10
   A = rand(5,3);
   B = rand(6,3);
   C = rand(3,3);
   D = rand(2,3);
   Merge(:,:,k) = [A;B;C;D]; 
end
Merge   % combined values as matrix 

Merge = 
Merge(:,:,1) =

    0.4013    0.1239    0.6253
    0.0575    0.6757    0.9368
    0.6054    0.1549    0.5772
    0.1325    0.2943    0.9639
    0.1470    0.6612    0.0220
    0.2870    0.5827    0.2388
    0.7312    0.4247    0.5491
    0.5576    0.6883    0.7665
    0.2159    0.9142    0.3130
    0.1697    0.7011    0.3541
    0.8969    0.3004    0.5008
    0.6640    0.8416    0.7442
    0.1350    0.2872    0.5360
    0.8817    0.8070    0.2283
    0.8939    0.3989    0.2912
    0.1857    0.0025    0.3082


Merge(:,:,2) =

    0.9083    0.3718    0.7547
    0.7567    0.0680    0.0013
    0.2502    0.0963    0.1959
    0.1373    0.5104    0.3175
    0.3609    0.6469    0.8319
    0.2694    0.2631    0.4599
    0.9861    0.4356    0.9003
    0.1011    0.0077    0.4222
    0.9156    0.7849    0.7488
    0.0180    0.9633    0.0655
    0.6900    0.3952    0.1234
    0.8493    0.7677    0.1017
    0.9807    0.2626    0.0635
    0.7578    0.8257    0.4295
    0.3333    0.1609    0.0389
    0.0415    0.3197    0.1718


Merge(:,:,3) =

    0.8455    0.8560    0.1672
    0.8854    0.7139    0.6410
    0.6673    0.9314    0.6411
    0.1420    0.3113    0.8319
    0.7799    0.9299    0.2699
    0.3133    0.3431    0.5494
    0.5225    0.2447    0.4290
    0.4488    0.8724    0.9491
    0.1973    0.6345    0.5107
    0.8671    0.2723    0.9212
    0.2808    0.8582    0.3671
    0.0526    0.7805    0.2968
    0.8329    0.1824    0.1772
    0.6170    0.4640    0.0553
    0.5558    0.3442    0.6181
    0.4607    0.7660    0.4603


Merge(:,:,4) =

    0.0731    0.3916    0.3055
    0.2967    0.4049    0.9743
    0.5666    0.4559    0.5670
    0.8539    0.5190    0.2710
    0.0706    0.7758    0.3927
    0.7906    0.7653    0.6544
    0.3889    0.4093    0.4368
    0.1360    0.6452    0.3209
    0.8387    0.7760    0.1953
    0.1803    0.8682    0.0191
    0.6442    0.4866    0.8624
    0.6424    0.1472    0.9528
    0.7384    0.0668    0.2558
    0.1158    0.0448    0.6112
    0.2941    0.8107    0.9121
    0.8526    0.3854    0.0932


Merge(:,:,5) =

    0.6052    0.8352    0.1316
    0.1029    0.8254    0.3124
    0.9234    0.6807    0.7693
    0.0773    0.9834    0.8261
    0.1536    0.6563    0.6946
    0.4976    0.1211    0.4553
    0.2499    0.4747    0.3692
    0.6358    0.0990    0.6858
    0.2322    0.7707    0.8059
    0.7509    0.7066    0.9633
    0.8539    0.2177    0.9448
    0.2793    0.4442    0.8497
    0.9969    0.9146    0.4039
    0.2875    0.4864    0.5161
    0.2265    0.4107    0.8316
    0.9611    0.2594    0.1673


Merge(:,:,6) =

    0.5266    0.1328    0.9968
    0.8267    0.8494    0.5613
    0.8899    0.5494    0.0108
    0.9486    0.3950    0.5713
    0.7804    0.5162    0.8452
    0.6143    0.3971    0.0572
    0.9394    0.8118    0.8778
    0.2162    0.7978    0.2205
    0.7541    0.7829    0.6563
    0.4957    0.8281    0.5609
    0.7650    0.2779    0.8776
    0.2450    0.3081    0.4832
    0.5828    0.6518    0.8811
    0.4564    0.7928    0.8943
    0.2251    0.3501    0.8329
    0.9451    0.0632    0.0891


Merge(:,:,7) =

    0.7692    0.4461    0.9644
    0.4734    0.5234    0.8325
    0.7735    0.8702    0.6563
    0.2759    0.7548    0.4174
    0.2914    0.2579    0.0562
    0.1059    0.5451    0.8564
    0.3397    0.7212    0.4660
    0.1763    0.5526    0.2931
    0.1584    0.9013    0.8095
    0.6209    0.2377    0.7214
    0.4278    0.2810    0.6115
    0.0964    0.2654    0.8508
    0.7475    0.0546    0.2377
    0.0218    0.2716    0.9645
    0.9191    0.0321    0.4831
    0.1514    0.5137    0.6212


Merge(:,:,8) =

    0.3294    0.6343    0.5948
    0.3720    0.6073    0.0937
    0.3811    0.9372    0.6604
    0.4051    0.5465    0.4951
    0.9453    0.9426    0.0910
    0.7541    0.3798    0.9870
    0.2794    0.1277    0.8975
    0.3408    0.0500    0.0851
    0.5950    0.9886    0.9369
    0.8244    0.6924    0.2579
    0.7462    0.5800    0.4700
    0.4291    0.2433    0.4843
    0.7770    0.8681    0.0873
    0.9527    0.1664    0.1354
    0.0801    0.6208    0.6704
    0.5934    0.9052    0.5313


Merge(:,:,9) =

    0.4093    0.9055    0.2112
    0.1072    0.8252    0.5092
    0.8709    0.6789    0.1874
    0.4658    0.3886    0.9119
    0.3406    0.5269    0.8839
    0.0971    0.3159    0.9479
    0.0395    0.7674    0.2077
    0.4929    0.6431    0.8986
    0.4726    0.1378    0.5373
    0.8689    0.9096    0.1570
    0.4559    0.5540    0.2322
    0.7081    0.7302    0.6555
    0.3976    0.7064    0.0746
    0.8982    0.7447    0.0848
    0.6105    0.9197    0.7606
    0.7136    0.3730    0.2990


Merge(:,:,10) =

    0.8527    0.3783    0.4198
    0.6377    0.2912    0.9535
    0.5892    0.3628    0.4902
    0.8956    0.6733    0.0883
    0.2066    0.9275    0.3247
    0.7287    0.7245    0.7213
    0.7262    0.7077    0.9712
    0.2179    0.0094    0.0217
    0.5646    0.9169    0.9540
    0.5874    0.5577    0.7649
    0.1011    0.2813    0.0348
    0.9603    0.2688    0.0472
    0.2156    0.4576    0.4638
    0.3953    0.8757    0.3562
    0.3292    0.2778    0.8646
    0.0883    0.7493    0.7235