Working with R, I was looking for functionality to easily subset my data based on a sequence of numbers.  After writing a for loop and using rbind to do it initially (terrible to do in R!), I finally found a way to do this efficiently.  Using a command called %in%, you can easily apply it as a filter in the subset command to get data filtered based on your sequence.  Enjoy!

# Generate sample data based to test.
sample_data <- data.frame(ID=seq(1,100,1),
                          Score=sample(0:100,100,rep=TRUE))
summary(sample_data)

# Plot the scores, see that there is a score for each id.
plot(sample_data$Score~sample_data$ID)

# Create a filter to apply.
look_at <- seq(1,100,10)

# Filter the sample data by look_at using the %in% command.
subset_data <- subset(sample_data, ID %in% look_at)

# Plot the scores, note the filtered data.
plot(subset_data$Score~subset_data$ID)