'Extract rows in R dataframe which aligns with dummyvariable

I would like to create one vector of every MKT observation for when the dummy variable equals 1 and another vector when dummy equals 0.

This is how my dataframe looks:

Solution 1:^[1]

Easy solution with dplyr:

df_new <- filter(SP500.df, dummy == 1)

You can do this with base R as well.

## Case when dummy = 1
MKT_vector = SP500.df[SP500.df$dummy==1,]$MKT

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Solution	Source
Solution 1	geoff
Solution 2	Deepansh Arora