# R Example for Beginners – R Program to change the first level of a factor with another level of a given factor

In this Learn by Coding example, we are explaining how to write an R program to change the first level of a factor with another level of a given factor. Here we are using built-in functions levels(),factor() for this conversion. The vector values are passed to these functions directly here. The levels(), factor() functions in R computes the levels of factors of the vector in a single function.

Using the function factor() we can create a factor of the vector and by using the level() function we can find levels of a factor. Factors are stored as integer vectors and which is closely related to vectors. The syntax of these functions are

levels(x) #where x is an object, for example, a factor factor(x = character(), levels, labels = levels,exclude = NA, ordered = is.ordered(x), nmax = NA)
– Where x is a vector of data, usually taking a small number of distinct values.

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## Two Machine Learning Fields

There are two sides to machine learning:

• Practical Machine Learning: This is about querying databases, cleaning data, writing scripts to transform data and gluing algorithm and libraries together and writing custom code to squeeze reliable answers from data to satisfy difficult and ill defined questions. It’s the mess of reality.
• Theoretical Machine Learning: This is about math and abstraction and idealized scenarios and limits and beauty and informing what is possible. It is a whole lot neater and cleaner and removed from the mess of reality.

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