Calculate Standard deviation in table

2021 6 25
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更新时间：2022 1 24
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Hi,
I have a table with 20 columns, I want to make a new column with the standard deviation of each row from column 4 to 6.
So after column 6 i want to have a column with the stdev of all rows of column 4:6.
How can I do that?

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Chunru
Chunru 2021-6-25
Ran in:

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Ran in:
a = array2table(rand(5,8)) % Sample table
a = 5×8 table
Var1 Var2 Var3 Var4 Var5 Var6 Var7 Var8 _______ _______ _______ _________ _______ _________ _______ _______ 0.4022 0.9627 0.53548 0.35205 0.70636 0.89738 0.50393 0.44203 0.96785 0.33289 0.57833 0.36493 0.84985 0.0031283 0.34461 0.3312 0.29543 0.18861 0.91065 0.025623 0.40162 0.88419 0.24007 0.38235 0.66403 0.19131 0.24685 0.0092594 0.10672 0.51052 0.79236 0.43115 0.62483 0.95579 0.37075 0.11087 0.65024 0.55079 0.97985 0.57458
s = std(a{:, 4:6}, [], 2) % std along rows (dim=2)
s = 5×1
0.2767 0.4249 0.4304 0.2658 0.2870
b = [a table(s, 'VariableNames', {'std'})] % combine with original
b = 5×9 table
Var1 Var2 Var3 Var4 Var5 Var6 Var7 Var8 std _______ _______ _______ _________ _______ _________ _______ _______ _______ 0.4022 0.9627 0.53548 0.35205 0.70636 0.89738 0.50393 0.44203 0.27671 0.96785 0.33289 0.57833 0.36493 0.84985 0.0031283 0.34461 0.3312 0.42485 0.29543 0.18861 0.91065 0.025623 0.40162 0.88419 0.24007 0.38235 0.43038 0.66403 0.19131 0.24685 0.0092594 0.10672 0.51052 0.79236 0.43115 0.26577 0.62483 0.95579 0.37075 0.11087 0.65024 0.55079 0.97985 0.57458 0.28704

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Erkan MSN
Erkan MSN 2022-1-24

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If you want to calculate the standard deviation of the whole table:
For example "cax" is table.
1.6424 5.2601 1.4691 0.7361 0.2771
1.0531 0.5722 1.8804 4.9636 0.9451
1.8084 1.6537 1.5916 0.8352 0.7740
0.7550 1.4221 1.7003 2.5646 0.4272
2.2935 2.5158 0.7656 1.0110 2.0810
1.0765 0.5390 1.9687 2.0829 0.4572
1.0493 1.4736 1.2810 1.0911 0.2073
2.1630 0.5679 2.8582 1.6006 0.4746
1.1625 0.7333 0.2623 0.6887 0.7897
2.9148 0.2886 3.1662 0.3645 0.5730
std(cax,[],'all')
ans =
1.0786e+03

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