How to filter a dataframe based on a list of values from one column

Hi everyone, I am new to RStudio. I am working with a dataframe that consists of 5 columns: SampleID; chr; pos; ref; mut. These are variant calls from a large cohort of samples (>900 unique SampleIDs).

I want to filter this dataframe and create a new dataframe that includes rows only corresponding to a specific list of SampleIDs (~100 unique SampleIDs).

Is there a way I can import my list of desired SampleIDs, filter the original dataframe and create a new dataframe that consists only of the data from my list of SampleIDs?

Thank you so much in advance for your time.

### asssuming the csv is like
# SampleID
# 342
# 377
# 899

sample_ids <- read.csv(file=#path to your csv within quote marks "myfile.csv"


my_second_df <- filter(my_first_df,
                       SampleID %in% sample_ids$SampleID)
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Thank you so much @nirgrahamuk for the quick reply!

When I try this,

df2 <- filter(df1, df1$sampleID %in% sample_ids$sampleID)

I receive the error message,

Error: Problem with filter() input ..1.
x Input ..1 must be of size 5157308 or 1, not size 0.
i Input ..1 is df1$sampleID %in% sample_ids$sampleID.
Run rlang::last_error() to see where the error occurred.

this message implies that df1 does not contain a column/variable called precisely sampleID

you are recommended to check the column names like so


This worked, I had mistakenly typed "sampleID" when it was really "sampleId" in df1.
Thank you so so much!!! :smile:

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