Questions and answers

How do I Dcast data in R?

How do I Dcast data in R?

You use the dcast() function to cast a molten data frame. To be clear, you use this to convert from a long format to a wide format, but you also can use this to aggregate into intermediate formats, similar to the way a pivot table works. The dcast() function takes three arguments: data: A molten data frame.

How do I transpose a data table in R?

Rotating or transposing R objects That is, you transpose the rows and columns. You simply use the t() command. The result of the t() command is always a matrix object. You can also rotate a matrix object or a table, as long as the table only has 2 dimensions.

What is melting data in R?

Melting in R programming is done to organize the data. It is performed using melt() function which takes dataset and column values that has to be kept constant. Using melt(), dataframe is converted into long format and stretches the data frame. Syntax: melt(data, na.rm = FALSE, = “value”)

What does Dcast mean?


Acronym Definition
DCAST Data Collection and Scheduling Tool

What library is melt in R?

The melt function is to be found in the reshape package. If you do not have that package installed, then you will need to install it with install. packages(“reshape”) before you can use it. Then, when the package is installed, make it available with library(reshape) .

How do you transpose a data table?

Go to a new cell outside your current table and look for the Paste button but don’t click it, click the popup menu below the button. Look for the Transpose option. As you can see in the figure below, our new table is transposed.

What does T () do in R?

t() function in R Language is used to calculate transpose of a matrix or Data Frame.

What is melting of data?

The melt() function is used to convert a data frame with several measurement columns into a data frame in this canonical format, which has one row for every observed (measured) value. Let’s melt data frame about states, with eight observations per row.

Is reshape2 deprecated?

frame and will attempt to redirect to the relevant reshape2 method; please note that reshape2 is deprecated, and this redirection is now deprecated as well. To continue using melt methods from reshape2 while both libraries are attached, e.g. melt. list, you can prepend the namespace like reshape2::melt(x).

How do you subset in R?

So, to recap, here are 5 ways we can subset a data frame in R:

  1. Subset using brackets by extracting the rows and columns we want.
  2. Subset using brackets by omitting the rows and columns we don’t want.
  3. Subset using brackets in combination with the which() function and the %in% operator.
  4. Subset using the subset() function.

How does Rbind work in R?

rbind() function combines vector, matrix or data frame by rows. The column numbers of the two datasets must be the same, otherwise the combination will be meaningless. If two vectors do not have the same length, the elements of the short one will be repeated.