What happens when you subset with two vectors?
The result is a vector of values: data frames have the characteristics of both lists and arrays: if subset with a single vector, they behave like lists; if you subset with two vectors, they behave like arrays.
Table of Contents
How to combine a list of vectors into a single vector?
This one clearly beat the other. This uses the shortened (uncapitalized) version of purrr in combination with pipes. Also note that if the list contains named vectors, the final naming will be different depending on whether the unlist or reduce methods are used.
How do you add a vector to a list?
Additional vectors can be added by specifying the position in the list where we want to add the new vector. New elements are concatenated at the end of the list. Multiple items can also be added to a list with the use of a ‘for’ or ‘while’ loop. These elements can be vectors, matrices, numeric or variables.
Is there a way to merge two lists into one?
There are two ways to merge lists into one: the c() function or the add() function, both of which take arguments like the lists to combine. The time complexity required to merge two lists is O(m) where m is the size of the list that appears first in the function. List1 contains an integer vector and a boolean vector.
How to create a subset of a dataframe using a list of dates?
I would like to extract from the dataframe those rows where the date column matches any of the elements in a pre-existing list of dates. For example, using a one item list, the date ‘2012-01-01’ would pull the row with the date ‘2012-01-01’ from the data frame.
Are there different ways to create subsets of atomic vectors?
There are six ways to create subsets of atomic vectors. There are three subset operators,[[and$Subsettingoperatorsinteractdifferentlywithdifferenttypesofvectors(forexampleatomicvectorslistsfactorsmatricesanddataframes)Subsettingcanbecombinedwithassignment[[y$Losoperadoresdecreacióndesubconjuntosinteractúandemaneradiferentecondiferentestiposdevectores(porejemplovectoresatómicoslistasfactoresmatricesymarcosdedatos)Lacreacióndesubconjuntossepuedecombinarconlaasignación
How are logical vectors subdivided in advanced R?
Logic vectors select elements where the corresponding logical value is TRUE. If the logical vector is shorter than the vector being subdivided, it will be recycled to be the same length. Nothing returns the original vector. This is not useful for vectors, but is very useful for arrays, data frames, and arrays.