Enter the elements of matrix in a specified location of a text file

Hello,

I have a 10x10x10 matrix and each square contains a value between 1 and 2. What I want is, the first element of that matrix will be used in line 10, 2nd element in line 20, 3rd element in line 30,..........100th element in line 1000 of a text file. Is there any way to do that?

[Dyuman Joshi]

And the rest of lines should be empty? or filled with any other values? And what exactly do you mean by used?

[MD MAHABUBUR ROHOMAN]

Rest of the lines will be filled up likewise. Element 101 will be assigned in the 9th line, element 102 in the 19th, element 103 in the 29th.......... element 200 in the line 999.

I meant the value of the elements will be assigned in a specified line.

[Dyuman Joshi]

What about line 1, 2, 3, ... 11, 12, 13 etc?

[MD MAHABUBUR ROHOMAN]

they will be filled up likewise. element 201 in the line 8, element 301 in the line 7, element 401 in the line 6,......... element 901 in the ine 1, element 902 in the line 11, element 903 in the line 21

Answer 1

[Voss]

% "data" would contain your data, but for 
% demonstration, I use 1:1000 in order:
data = reshape(1:1000,[10 10 10]); % 10x10x10 array

% rearrange the elements of data as specified:
new_data = permute(data(:,:,end:-1:1),[3 1 2]);

% write to file, one element per line:
writematrix(new_data(:),'file.txt');

% check the result
type file.txt

901
801
701
601
501
401
301
201
101
1
902
802
702
602
502
402
302
202
102
2
903
803
703
603
503
403
303
203
103
3
904
804
704
604
504
404
304
204
104
4
905
805
705
605
505
405
305
205
105
5
906
806
706
606
506
406
306
206
106
6
907
807
707
607
507
407
307
207
107
7
908
808
708
608
508
408
308
208
108
8
909
809
709
609
509
409
309
209
109
9
910
810
710
610
510
410
310
210
110
10
911
811
711
611
511
411
311
211
111
11
912
812
712
612
512
412
312
212
112
12
913
813
713
613
513
413
313
213
113
13
914
814
714
614
514
414
314
214
114
14
915
815
715
615
515
415
315
215
115
15
916
816
716
616
516
416
316
216
116
16
917
817
717
617
517
417
317
217
117
17
918
818
718
618
518
418
318
218
118
18
919
819
719
619
519
419
319
219
119
19
920
820
720
620
520
420
320
220
120
20
921
821
721
621
521
421
321
221
121
21
922
822
722
622
522
422
322
222
122
22
923
823
723
623
523
423
323
223
123
23
924
824
724
624
524
424
324
224
124
24
925
825
725
625
525
425
325
225
125
25
926
826
726
626
526
426
326
226
126
26
927
827
727
627
527
427
327
227
127
27
928
828
728
628
528
428
328
228
128
28
929
829
729
629
529
429
329
229
129
29
930
830
730
630
530
430
330
230
130
30
931
831
731
631
531
431
331
231
131
31
932
832
732
632
532
432
332
232
132
32
933
833
733
633
533
433
333
233
133
33
934
834
734
634
534
434
334
234
134
34
935
835
735
635
535
435
335
235
135
35
936
836
736
636
536
436
336
236
136
36
937
837
737
637
537
437
337
237
137
37
938
838
738
638
538
438
338
238
138
38
939
839
739
639
539
439
339
239
139
39
940
840
740
640
540
440
340
240
140
40
941
841
741
641
541
441
341
241
141
41
942
842
742
642
542
442
342
242
142
42
943
843
743
643
543
443
343
243
143
43
944
844
744
644
544
444
344
244
144
44
945
845
745
645
545
445
345
245
145
45
946
846
746
646
546
446
346
246
146
46
947
847
747
647
547
447
347
247
147
47
948
848
748
648
548
448
348
248
148
48
949
849
749
649
549
449
349
249
149
49
950
850
750
650
550
450
350
250
150
50
951
851
751
651
551
451
351
251
151
51
952
852
752
652
552
452
352
252
152
52
953
853
753
653
553
453
353
253
153
53
954
854
754
654
554
454
354
254
154
54
955
855
755
655
555
455
355
255
155
55
956
856
756
656
556
456
356
256
156
56
957
857
757
657
557
457
357
257
157
57
958
858
758
658
558
458
358
258
158
58
959
859
759
659
559
459
359
259
159
59
960
860
760
660
560
460
360
260
160
60
961
861
761
661
561
461
361
261
161
61
962
862
762
662
562
462
362
262
162
62
963
863
763
663
563
463
363
263
163
63
964
864
764
664
564
464
364
264
164
64
965
865
765
665
565
465
365
265
165
65
966
866
766
666
566
466
366
266
166
66
967
867
767
667
567
467
367
267
167
67
968
868
768
668
568
468
368
268
168
68
969
869
769
669
569
469
369
269
169
69
970
870
770
670
570
470
370
270
170
70
971
871
771
671
571
471
371
271
171
71
972
872
772
672
572
472
372
272
172
72
973
873
773
673
573
473
373
273
173
73
974
874
774
674
574
474
374
274
174
74
975
875
775
675
575
475
375
275
175
75
976
876
776
676
576
476
376
276
176
76
977
877
777
677
577
477
377
277
177
77
978
878
778
678
578
478
378
278
178
78
979
879
779
679
579
479
379
279
179
79
980
880
780
680
580
480
380
280
180
80
981
881
781
681
581
481
381
281
181
81
982
882
782
682
582
482
382
282
182
82
983
883
783
683
583
483
383
283
183
83
984
884
784
684
584
484
384
284
184
84
985
885
785
685
585
485
385
285
185
85
986
886
786
686
586
486
386
286
186
86
987
887
787
687
587
487
387
287
187
87
988
888
788
688
588
488
388
288
188
88
989
889
789
689
589
489
389
289
189
89
990
890
790
690
590
490
390
290
190
90
991
891
791
691
591
491
391
291
191
91
992
892
792
692
592
492
392
292
192
92
993
893
793
693
593
493
393
293
193
93
994
894
794
694
594
494
394
294
194
94
995
895
795
695
595
495
395
295
195
95
996
896
796
696
596
496
396
296
196
96
997
897
797
697
597
497
397
297
197
97
998
898
798
698
598
498
398
298
198
98
999
899
799
699
599
499
399
299
199
99
1000
900
800
700
600
500
400
300
200
100

[MD MAHABUBUR ROHOMAN]

Thanks for your reply. If I use your data it gives what I need. But if I use my data, s = ceil(q.*rand(n,n,n));

it outputs the value of 911th element instead of 902th element as 11th entry. Am I doing something wrong?

[Voss]

Seems ok here.

n = 10;
q = 1e4;
s = ceil(q.*rand(n,n,n));

s(902)

ans = 3351

new_s = permute(s(:,:,end:-1:1),[3 1 2]);

new_s(11)

ans = 3351

I would double-check your code and resulting text file. If there still seems to be a problem, upload them both here.

[MD MAHABUBUR ROHOMAN]

If I follow your code, I end up with the attached pictures.

[Voss]

Indexing in MATLAB is column-major, meaning elements are counted down the first column first, not across the first row, so the element you circled is actually element 911, not 902.

Example:

reshape(1:100,10,10) % 1 to 100 in order

ans = 10×10

1 11 21 31 41 51 61 71 81 91 2 12 22 32 42 52 62 72 82 92 3 13 23 33 43 53 63 73 83 93 4 14 24 34 44 54 64 74 84 94 5 15 25 35 45 55 65 75 85 95 6 16 26 36 46 56 66 76 86 96 7 17 27 37 47 57 67 77 87 97 8 18 28 38 48 58 68 78 88 98 9 19 29 39 49 59 69 79 89 99 10 20 30 40 50 60 70 80 90 100

Notice it goes 1 to 10 down the first column, then element 11 is in the second column, first row.

To count across the first row first, do this:

new_s = permute(s(:,:,end:-1:1),[3 2 1]);

[MD MAHABUBUR ROHOMAN]

Thanks for your help. It is working for me and I understood your point.

[Voss]

You're welcome! I'm glad it's working and it makes sense.