# how to select specific values in a matrix

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Shani on 18 Nov 2013
Commented: Image Analyst on 23 Nov 2013
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
Image Analyst on 23 Nov 2013
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

Doug Hull on 18 Nov 2013
>> 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 CommentsShowHide 1 older comment
BSantos on 18 Nov 2013
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).