Set NA and "" Cells in R Dataframe to NULL -

I have a data frame in R, where some columns have values ​​in some rows NA or Empty strings "" I want to convert them to NULL values ​​

So I need any cell in my data frame that is < Code> NA or "" should be NULL How can I do this?

When I try:

  DF [, DF $ column == NA]  -  

or < / P>

  df [, df $ column == ""]  

I get an error: are missing values ​​

  DF [, is.na (df $ column)]  
  
 
  
 / code> 

I get an error: Duplicate subscript for columns < / Code>

If I try:

  is.na (df $ column) & lt; - NULL  

or

  DF [DF == NA] & lt; - NULL  

I have not found any errors, but nothing has changed in my dataframe.

There is actually no zero in the value in vector NA is placeholder if you want to remove the whole column (Which is what will happen), when its values ​​are all NA, then it will be successful:

  df [, sapply (df, function (x) all (If.na (x) ))) & Lt; - NULL  

If you want to create an object where you only place those lines with NA values:

  df [apply (DF) , 1, function (rw)! Any (is.na (rw)),]