bfill!

bfill(obj, [limit])

obj is a vector or table.

limit (optional) is a positive integer indicating the number of NULL values to be filled.

• 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.

x=1 2 3 NULL NULL NULL 4 5 6
x.bfill!()
x;
// output
[1,2,3,4,4,4,4,5,6]

x=1 2 3 NULL NULL NULL 4 5 6
x.bfill!(1)
x;
// output
[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

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.