# How to extract common & uncommon variables

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Mekala balaji on 27 Jan 2018
Commented: Walter Roberson on 1 Feb 2018
Hi,
I have 5 test data of 10 (actually more than 150 variables) variables. Each test data of a particular variable is observed for one minute (50 data per minute), and I calculated the Standard deviation of 50 data point per each variable in each test. The STD is given below:
Test1 Test2 Test3 Test4 Test5
V1 0.00010 0.00200 0.01000 0.00300 0.00005
V2 0.00010 0.00000 0.01000 0.00300 0.00005
V3 0.00010 0.00200 0.02000 0.00100 0.00000
V4 0.00050 0.00100 0.03000 0.00100 0.00002
V5 0.00030 0.00200 0.01000 0.00200 0.00005
V6 0.00010 0.00300 0.00400 0.00310 0.00105
V7 0.00010 0.00100 0.01000 0.00310 0.00041
V8 0.00510 0.00500 0.00500 0.00140 0.00005
V9 0.00300 0.00200 0.03300 0.01300 0.03005
V10 0.00010 0.00200 0.01000 0.00300 0.00005
I want to extract the common variables in five tests whose STD >=0.001, and uncommon variables whose STD is <=0.001
Kindly someone help, and many thanks in advance,

#### 1 Comment

Bernhard Suhm on 1 Feb 2018
Can you clarify what you mean by "common" versus "uncommon" variables?

Walter Roberson on 1 Feb 2018
Tests = [Test1,Test2,Test3,Test4,Test5];
common_vars = find(all(Tests>0.001, 2));
uncommon_vars = find(all(Tests<0.001, 2));
other_vars = setdiff(1:10, union(common_vars, uncommon_vars));

Mekala balaji on 1 Feb 2018
clear all;
clc
Tests=cell2mat(c(2:end,2:end));
common_vars = find(all(Tests>0.001, 2));
uncommon_vars = find(all(Tests<0.001, 2));
other_vars = setdiff(1:10, union(common_vars, uncommon_vars));
do I need to concatenate the column like FinalTests=[Tesst(:,1),Tesst(:,2),Tesst(:,3),Tesst(:,3),Tesst(:,4),Tesst(:,5)]
It gives me the following result:
>> common_vars
common_vars =
9
>> uncommon_vars
uncommon_vars =
0×1 empty double column vector
>> other_vars
other_vars =
1 2 3 4 5 6 7 8 10
But my desired output:
Name of variable(s) whose value is <=0.001 in all "tests"-->Commom
For example: If I set:
common_vars = find(all(Tests>0.005, 2));
it should give me:
[V6 V8]
-->because its values are <=0.006 in all tests)
Walter Roberson on 1 Feb 2018
No -- V6 starts with 0.00010 which is 1/10th of 0.001
V8 ends in 0.00005 which is 1/20th of 0.001
In my code if you change the > to >= then you will get V9 as common.