Add a variable to table
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Hi,
I want to join 2 tables together.
In order to do that, table 1 must have the same number of columns as table 2.
table 1 has 8 variables
table 2 has 9 variables
So, I want to add a column to table 8
The variable will be of no use - it will just be a kind of dummy variable
How can I do this?
Thank you.
回答（1 个）
Turlough Hughes
2019-12-15
编辑：Turlough Hughes
2019-12-15
Hey Sarah,
Let's say you have two tables, as follows:
T1=table((1:10).',(10:-1:1).');
T2=table((11:20).',(20:-1:11).',(1:10).');
To add a dummy column you could write the following;
T1.dummy=NaN(size(T1,1),1);
To concatenate them, ensure firstly that the VariableNames are the same, which ought to be the case anyway except for T1.dummy:
T1.Properties.VariableNames=T2.Properties.VariableNames;
You can then concatenate the tables as follows:
T=[T1;T2];
Finally, with this approach I assume that the values in the last column of T2 are still important (otherwise you could just write a table without the last column of T1)
T=[T1;T2(:,1:end-1)];
EDIT: following comments below.
4 个评论
Sarah Yun
2019-12-15
Turlough Hughes
2019-12-15
Ah ok. Do the variables have the same names?
Turlough Hughes
2019-12-15
编辑：Turlough Hughes
2019-12-15
For example if you had:
T1=table((1:10).',(10:-1:1).');
T2=table((11:20).',(20:-1:11).',(1:10).');
You could concatenate them as follows:
T=[T1; T2(:,1:end-1)];
Turlough Hughes
2019-12-15
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