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sum(with(df,gender = 'M' & stream = 'Commerce'))Īnother method involves the use of the nrow() function, which returns the number of rows in a dataset. We can also add multiple expressions using the & operator. The following code snippet will show how this works. The with() function returns a logical vector based on some expression after applying it to the whole dataset, and the sum() function will return the sum of all the True observations. The first method involves the with() and the sum() functions. Stream = c('Arts','Science','Arts','Commerce')) We will work on the following DataFrame in this tutorial. This may exceed hundreds of observations, and sometimes there may be a need to extract some specific data from the whole.įor such situations, we have a few methods in R, which can aid in counting the total observations of this filtered data. In real-life situations, we deal with large sets of data.

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