Adding a new variable to a table and assigning a value

I am working with a table with multiple variables (called T3) - dimensions are 1349x26. This is one station (CTD instrument).

I want to add a new variable called Station ID and define it's value as 3 for all 1349 rows.

I know how to do it in the table, but I am confused how to write it in a code.

Example of what I did:

Station ID = 3;

T3 = addvars(T3, Station ID, 'Before', 'VarName1');

I was using the addvars function but I kept getting an error because Station ID's number of rows, does not match the table's height.

How can I define Station ID's dimensions and fill all 1349 rows with the same value?

Answer 1

[Dyuman Joshi]

"How can I define Station ID's dimensions and fill all 1349 rows with the same value? "

There are many ways of doing that -

%Number of rows in the table
s = size(T3,1);

%Method 1
Station_ID = 3*ones(s,1); 

%Method 2
Station_ID = repelem(3,s,1);

%Method 3
Station_ID = 3 + zeros(s,1);

[Rachel]

Thank you!

Just a clarification, the 1 in s= size(T3,1) means just for one column correct?

[Dyuman Joshi]

No, the 1 is used to get the size of the 1st dimension of T3, as rows are the 1st dimension of matrices.

Here's an example to give you more idea about it -

T3 = zeros(2,3,5);

%Get the size of T3
size(T3)

ans = 1×3

2 3 5

%Get the size of 1st dimension of T3
size(T3,1)

ans = 2

%Get the size of 2nd dimension of T3
size(T3,2)

ans = 3

%Get the size of 3rd dimension of T3
size(T3,3)

ans = 5

Refer to the documentation of size for additional information.

Also, @Rachel, if my answer solved your problem, please consider accepting it.