dropna
Syntax
dropna(X, [byRow=true], [thresh])
Arguments
X is a vector or matrix.
byRow is a Boolean value. The default value is true.
thresh is a positive integer.
Details
If X is a vector, delete all NULL values from X.
If X is a matrix and byRow=true, delete all rows with NULL values.
If X is a matrix and byRow=false, delete all columns with NULL values.
If thresh is specified, each row or column (as specified by byRow) in the result must have at least thresh non-NULL values.
New in version 1.30.0.
Examples
$ x=1 NULL 2 3 NULL NULL 4;
$ x.dropna();
[1,2,3,4]
$ m=matrix(1 1 1 1, 1 1 1 NULL, 1 NULL 1 NULL);
$ m;
#0 |
#1 |
#2 |
|---|---|---|
1 |
1 |
1 |
1 |
1 |
|
1 |
1 |
1 |
1 |
$ dropna(m);
#0 |
#1 |
#2 |
|---|---|---|
1 |
1 |
1 |
1 |
1 |
1 |
$ dropna(m,,2);
#0 |
#1 |
#2 |
|---|---|---|
1 |
1 |
1 |
1 |
1 |
|
1 |
1 |
1 |
$ dropna(m,false);
#0 |
|---|
1 |
1 |
1 |
1 |
$ dropna(m,false,3);
#0 |
#1 |
|---|---|
1 |
1 |
1 |
1 |
1 |
1 |
1 |