Add array as new column

[landge]

Hi!

Is it possible to add an array (or adequate other data structure) as a new column to an existing table?

In python/pandas you could do something like this:

df = pandas.DataFrame()
df['column_name'] = [1,2,3]

This would give you the following table:

	column_name
0	1
1	2
2	3

How could this be done with arquero? Or do you have to use join to accomplish this?

Somehow I feel that I am missing something essential 😕
Thanks for your help.

/Till

[jheer]

Yes, take a look at the table.assign() method. For example:

const newTable = oldTable.assign({ column_name: [1, 2, 3] })

Of course, the new column lengths must match the old columns.

[cristianvogel]

is there something that can be done when the rowCount / column lengths don't match up?

[landge]

Thank you !! 🙏🏽

[cristianvogel]

This worked for me in Replit to add a column of indices to a table
oldTable.assign({ index: oldTable.indices() })
but in context, the IDE gives a warning Argument type {index: Uint32Array} is not assignable to parameter type ColumnTable