Create a list of ColumnInformation from the specified table.

 cil = ColumnInformationList.new(table)

Append a new column to the table. See ColumnInformationList#[]= for details on what "options" can look like.

 cil << {:name => 'new_column_1', :format => 'A10'}
 cil << [{:name => 'new_column_1', :format => 'A10'}, {:name => 'new_column_2', :format => 'I'}]

Retrieve the ith column‘s information.

 cil[1]  # the second column's information

Insert a column into the ith position. "options" is a hash with two keys:

:name

the name of the column

:format

the format of the column as explained in the cfitsio documentation

You can also insert multiple columns at the same time by passing an array of hashes of the format explained above.

 cil[1] = {:name => 'new_column_1', :format => 'A10'}
 cil[1] = [{:name => 'new_column_1', :format => 'A10'}, {:name => 'new_column_2', :format => 'I'}]

Delete the ith column.

 cil.delete(1)  # delete the second column

Iterate through each ColumnInformation object.

The number of columns in the table.

 cil.size  # 4