R which.min

You can see that it has completely ignored the NA value, and it returns as the minimum value. That means the minimum weight of the ChickWeight dataset is You can find the minimum value of all the columns of your data matrix by using the sapply function. The sapply function works like lapply , but it tries to interpret the output to the most fundamental data structure possible, either Vector or Matrix. We will use the mtcars dataset and find the minimum value between two columns.

For example, we will find the minimum value of the columns mpg and cyl of mtcars. The computation of the global minimum value of a data frame is straightforward. Just apply the min function and pass the data frame as an argument that returns the min value. We can use the min function to define the minimum of strings in alphabetic order.

Viewed 2k times. For example, List 1: [1] 1 1 1 1 3 2 3 2 1 1 Meaning row 1,2,3,4,9,and 10 belongs to group 1, row 6 and 8 belongs to group 2 row 5 and 7 belongs to group 3.

Improve this question. Jaap Add a comment. Active Oldest Votes. Try: lapply minDist, function x max. Improve this answer. We can use lapply to loop over the list elements and then do the apply lapply minDist, function x apply x, 1, which. Furthermore, please subscribe to my email newsletter to get updates on the newest tutorials.

Your email address will not be published. Post Comment. On this website, I provide statistics tutorials as well as code in Python and R programming. It can be used to combine any number of vectors, of any length. For example, the following expression combines four vectors—of length 3, 1, 3 and 2—into a new vector of length Here is another example of using the c function, this time to combine four character values into a vector of length We can access individual vector elements using the [ operator and a numeric index.

That way, we can get a subset with an individual vector element:. Note that numeric indices in R start at 1 10! Note the three components of an expression for accessing a vector element Figure 2.

We can also make an assignment into a vector subset, for example to replace an individual element:. In this example, we made an assignment into a subset with a single element.

As we will see later on, we can assign values into a subset of any length, using the same method Section 2. There are numerous functions for calculating vector properties in R. The length , min , max , range , mean and sum are most commonly used. Contrariwise, there are functions that operate on each vector element, separately , returning a vector of results having the same length as the input:. Note that the last expression produced a warning.

A warning, in R, signals to the user that something suspicious or notable has happened. A warning differs from an error Section 1. However, when an error is raised, code evaluation stops and the expression is not executed by the interpreter. Binary operations, such as arithmetic Section 1. The result is, then, a vector of the respective results:. What happens when the input vector lengths do not match? For example, when one of the vectors is of length 3 and the other vector is of length 6, then the shorter vector of length 3 is replicated two times, until it matches the longer vector Figure 2.

Thus, the expression:. When one of the vectors is of length 1 and the other is of length 4, the shorter vector of length 1 is replicated 4 times:. When one of the vectors is of length 2 and the other is of length 6, the shorter vector of length 2 is replicated 3 times:. What happens when the longer vector length is not a multiple of the shorter vector length? Incomplete recycling is rarely something we want to do in practice. Therefore, the latter warning is usually an indication of something wrong in our code.

Other than the c function Section 2. The : operator is used to create a vector of consecutive values in steps of 1 :.

The seq function provides a more general way to create a consecutive vector with any step size, not necessarily 1 or The three most useful parameters of the seq function are:.

The above examples of the seq function are the first case we encounter where more than one argument is passed to a function as part of a function call Section 1.