[R] R how to find outliers and zero mean columns?

[Norman Pat]

Hi team

I am new to R so please help me to do this task.

Please find the  attached data sample. But in the original data frame I
have 350 features and 400000 observations.

I need to carryout these tasks.

1. How to Identify features (names) that have all zeros?

2. How to remove features that have all zeros from the dataset?

3. How to identify features (names) that have outliers such as 99999,-1 in
the data frame.

4. How to remove outliers?


Many thanks