Fold multiple columns by pattern¶
Transforms values from multiple columns into one line per column. This processor selects the columns to fold using a pattern. It only creates lines for non-empty columns.
If the pattern has a capture group, this processor uses the captured portion of the column name instead of the full column name.
Examples¶
Using .*_score as a column to fold pattern:
person |
age |
Q1_score |
Q2_score |
Q3_score |
|---|---|---|---|---|
John |
24 |
3 |
4 |
6 |
Sidney |
31 |
6 |
9 |
|
Bill |
33 |
1 |
4 |
becomes:
person |
age |
quarter |
score |
|---|---|---|---|
John |
24 |
Q1_score |
3 |
John |
24 |
Q2_score |
4 |
John |
24 |
Q3_score |
6 |
Sidney |
31 |
Q2_score |
6 |
Sidney |
31 |
Q3_score |
9 |
Bill |
33 |
Q1_score |
1 |
Bill |
33 |
Q3_score |
4 |
Using a capture group, with the pattern (.*)_score, the example becomes:
person |
age |
quarter |
score |
|---|---|---|---|
John |
24 |
Q1 |
3 |
John |
24 |
Q2 |
4 |
John |
24 |
Q3 |
6 |
Sidney |
31 |
Q2 |
6 |
Sidney |
31 |
Q3 |
9 |
Bill |
33 |
Q1 |
1 |
Bill |
33 |
Q3 |
4 |
Options¶
Columns to fold pattern
Write a regular expression to find matching columns, or choose Find with Smart Pattern to get help writing a regular expression. In the Smart Pattern window, you can highlight the portion of the column name that you wish to use. To use a pattern in the processor, select it and choose OK.
Column for fold name
Give a name for the new column that will contain the fold name. (“Quarter” in the example.)
Column for fold value
Give a name for the new column that will contain the fold value. (“Score” in the example.)
Remove folded columns
Check the box to delete folded columns after running the recipe.