bfill!
Syntax
bfill!(obj, [limit])
Details
If obj is a vector: back fill the NULL values in obj with the next non-NULL value.
If obj is a matrix or a table: back fill the NULL values in each column of obj with the next non-NULL value.
Examples
$ x=1 2 3 NULL NULL NULL 4 5 6
$ x.bfill!()
$ x;
[1,2,3,4,4,4,4,5,6]
$ x=1 2 3 NULL NULL NULL 4 5 6
$ x.bfill!(1)
$ x;
[1,2,3,,,4,4,5,6]
$ date=[2012.06.12,,2012.06.13,2012.06.14,2012.06.15]
$ sym=["IBM","MSFT","IBM","MSFT","MSFT"]
$ price=[40.56,26.56,,,50.76]
$ qty=[2200,4500,1200,5600,]
$ timestamp=[09:34:07,,09:36:42,09:36:51,09:36:59]
$ t=table(date,timestamp,sym,price,qty)
$ bfill!(t)
$ t
date |
timestamp |
sym |
price |
qty |
|---|---|---|---|---|
2012.06.12 |
09:34:07 |
IBM |
40.56 |
2200 |
2012.06.13 |
09:36:42 |
MSFT |
26.56 |
4500 |
2012.06.13 |
09:36:42 |
IBM |
50.76 |
1200 |
2012.06.14 |
09:36:51 |
MSFT |
50.76 |
5600 |
2012.06.15 |
09:36:59 |
MSFT |
50.76 |
If only certain columns need to be filled instead of all columns, please use update statement and bfill function. For details, please refer to bfill.