how to select specific values in a matrix

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Shani
Shani 2013-11-18
评论： Image Analyst 2013-11-23
Hi I will give an example, I have a 10X10 matrix, I want to select the 4th value in the first row, the 7th value in the 4th row and value 5 onwards on the 3rd row, and selecting multiple values from different rows. If anyone can help me. Thanks
  1 个评论
Image Analyst
Image Analyst 2013-11-23
Here is what Shani asked, so that it will still be here when she deletes this question:
Hi I will give an example, I have a 10X10 matrix, I want to select the 4th value in the first row, the 7th value in the 4th row and value 5 onwards on the 3rd row, and selecting multiple values from different rows. If anyone can help me. Thanks

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Doug Hull
Doug Hull 2013-11-18
>> a = magic(10)
a =
92 99 1 8 15 67 74 51 58 40
98 80 7 14 16 73 55 57 64 41
4 81 88 20 22 54 56 63 70 47
85 87 19 21 3 60 62 69 71 28
86 93 25 2 9 61 68 75 52 34
17 24 76 83 90 42 49 26 33 65
23 5 82 89 91 48 30 32 39 66
79 6 13 95 97 29 31 38 45 72
10 12 94 96 78 35 37 44 46 53
11 18 100 77 84 36 43 50 27 59
>> a(1,4)
ans =
8
>> a(4,7)
ans =
62
>> a(3,5:end)
ans =
22 54 56 63 70 47
  2 个评论
BSantos
BSantos 2013-11-18
If I understand correctly, that's because your matrix is a 10x10, so only 10 values per row/column.
BSantos
BSantos 2013-11-18
Ah no problem.
Also, that error message means that your matrix has 25 rows and 3 columns. So, it's not possible to access the value on W2(1,24).

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