清空筛选条件
清空筛选条件

Find numbers that are not in multiple columns

1 次查看（过去 30 天）
Dylan den Hartog
Dylan den Hartog 2021-5-18
编辑： Adam Danz 2021-5-19
I have three tables:
A1 =
5×2 table
x Var1
__ ____
1 2524
2 2342
3 4353
4 4353
5 2348
A2 =
5×2 table
x Var2
__ ____
1 6745
3 5942
4 9569
5 2454
6 1240
A3 =
5×2 table
x Var3
__ _____
2 4252
3 9345
4 9235
5 1246
6 3965
For each table I want to find and delete the rows that contains a number in the first row that is not in the first rows of both other tables. So I want to end up with this:
A1 =
3×2 table
x Var1
__ ____
3 4353
4 4353
5 2348
3×2 table
x Var2
__ ____
3 5942
4 9569
5 2454
A3 =
3×2 table
x Var3
__ ____
3 9345
4 9235
5 1246
How can I do this? Preferably with no loops.
  4 个评论
显示 2更早的评论
Siddharth Bhutiya
Siddharth Bhutiya 2021-5-19
I believe this is just a dummy example, but is there a reason you have a table with 1 two column variable instead of creating a table with 2 variables? The description of your problem makes it seem that the two columns of your Var1 are separate thing (they just seem to have the same data type).
Dylan den Hartog
Dylan den Hartog 2021-5-19
编辑：Dylan den Hartog 2021-5-19
You are right. I made I mistake. The tables are 5x2. I changed it in the problem description.

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Adam Danz
Adam Danz 2021-5-19
编辑：Adam Danz 2021-5-19
Ran in:
It looks like you are deleting all rows that do not contain the Var1 value in all 3 tables. Since all the tables will then have the same Var1 values you could combine them into 1 table. Use innerjoin :
% Demo tables
A1 = table((1:5)', rand(5,1))
A1 = 5×2 table
Var1 Var2 ____ _______ 1 0.84504 2 0.19125 3 0.23803 4 0.32501 5 0.41045
A2 = table([1;3;4;5;6], rand(5,1))
A2 = 5×2 table
Var1 Var2 ____ _______ 1 0.7915 3 0.85265 4 0.30851 5 0.1263 6 0.32535
A3 = table((2:6)', rand(5,1))
A3 = 5×2 table
Var1 Var2 ____ _______ 2 0.37713 3 0.26054 4 0.91348 5 0.9767 6 0.97345
% Join table A1 and A2 to create A12
A12 = innerjoin(A1,A2,'keys', 'Var1');
% Join A12 with A3 to create A123
A123 = innerjoin(A12, A3, 'keys','Var1');
You can rename the variables using A123.Properties.VariableNames = ____
If you'd rather not join the tables
a12mem = ismember(A1.Var1, A2.Var1);
a13mem = ismember(A1.Var1, A3.Var1);
A1new = A1(a12mem & a13mem,:)
A1new = 3×2 table
Var1 Var2 ____ _______ 3 0.23803 4 0.32501 5 0.41045
a21mem = ismember(A2.Var1, A1.Var1);
a23mem = ismember(A2.Var1, A3.Var1);
A2new = A2(a21mem & a23mem,:)
A2new = 3×2 table
Var1 Var2 ____ _______ 3 0.85265 4 0.30851 5 0.1263
and repeate for the 3rd table.

更多回答（1 个）

Sulaymon Eshkabilov
编辑：Sulaymon Eshkabilov 2021-5-19
Simle solution is a logical indexing approach, something like ...e.g.:
IND = A1.Var1~=A2.Var2;
A1=array2table([A1.x(IND), A1.Var1(IND)], 'variablenames', {'x', 'Var1'});
...
  1 个评论
Adam Danz
Adam Danz 2021-5-19
This does an ordered-comparison. Notice that the first row of table A3 should be removed but none of the other tables contains a 2 in the first row of column 1.
You'd need ismember if I understand the OP correctly.

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Tables 的更多信息

标签

产品


版本

R2020b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by