# Matrix dating

### Index

- Hot Crazy Matrix Chart
- How to return the matrix obtained from a data frame?
- What is the identity matrix of 1?
- How to multiply a matrix by a single number?
- How do you find the dot product of a matrix?
- How do I return a matrix from a data frame?
- Is it possible to convert a Dataframe to a numeric matrix?
- What is the argument of matrix?
- What is a logical data frame?

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### How to return the matrix obtained from a data frame?

Description: Return the matrix obtained by converting all the variables in a data frame to numeric mode and then binding them together as the columns of a matrix. Factors and ordered factors are replaced by their internal codes. This explains why the team names A, A, B, B, C were converted to the values 1, 1, 2, 2, 3.

### What is the identity matrix of 1?

Identity Matrix. The Identity Matrix is the matrix equivalent of the number 1: A 3×3 Identity Matrix. It is square (has same number of rows as columns) It can be large or small (2×2, 100×100, ... whatever) It has 1s on the diagonal and 0s everywhere else. Its symbol is the capital letter I.

### How to multiply a matrix by a single number?

(This one has 2 Rows and 3 Columns) To multiply a matrix by a single number is easy: These are the calculations: We call the number (2 in this case) a scalar, so this is called scalar multiplication. But to multiply a matrix by another matrix we need to do the dot product of rows and columns ...

### How do you find the dot product of a matrix?

To work out the answer for the 1st row and 1st column: The Dot Product is where we multiply matching members, then sum up: We match the 1st members (1 and 7), multiply them, likewise for the 2nd members (2 and 9) and the 3rd members (3 and 11), and finally sum them up.

### How do I return a matrix from a data frame?

Return the matrix obtained by converting all the variables in a data frame to numeric mode and then binding them together as the columns of a matrix. Factors and ordered factors are replaced by their internal codes. data.matrix: Convert a Data Frame to a Numeric Matrix rdrr.ioFind an R packageR language docsRun R in your browser Home

### Is it possible to convert a Dataframe to a numeric matrix?

All containing information is numbers (the non-number-rows I deleted), so it should be possible to convert the data frame into a numeric matrix. However, I do get a character matrix. I found the only way to solve this is to use as.numeric for each and every row, but this is quite time-consuming.

### What is the argument of matrix?

data.matrix(frame,rownames.force=NA) Arguments frame a data frame whose components are logical vectors, factors or numeric or character vectors. rownames.force

### What is a logical data frame?

a data frame whose components are logical vectors, factors or numeric or character vectors. rownames.force logical indicating if the resulting matrix should have character (rather than NULL) rownames.