What does Microsoft Math Solver do?

 It can help you to work with a number of math problems from areas from arithmetic to matrices. It's an app you can download for both iPhone and Android phones.

This may help you with your studies and you may ace the SAT exam. There is a download link to get your copy of the APP on your smartphone. It also shows the steps in the calculation which is very invaluable.

Here is a picture of the site in English and you can use other languages also. To type an equation you need to use the pertinent math problem you are interested in. It ranges from Pre_Algebra to Matrix Calculation. 

Give it a try.

Good luck

Here is the link:   https://mathsolver.microsoft.com

How do you represent a 3x3 matrix in R?

Matrix (matrices) is a data type in R used in many mathematical problems. A matrix has rows and columns. A 3 by 3 matrix has 3 rows and 3 columns. A matrix can have only columns, only rows and both columns and rows.

Here is an example of a 3x 3 matrix.

1, 2, 3
4, 5, 6
7, 8, 9

Let us create a matrix which is obtained by arranging the data, a vector of values 1,2,3,4,5,6,7,8,9 by assigning three elements each to a row and create 3 columns from the rows. This is how you do it in R.

Matrix_1

If you want to find the elements of this matrix, you provide the row and column where your element is found as shown.

You find 5 in the 2nd row and 2nd column and you find 6 in 2nd row and 3rd column.

Matrix_2
How do you arrange the same vectors column-wise arranged. You use the same definition as in the previous but omit, byrow attribute as shown.

Matrix_3

This is just the basic but you can do a whole lot more using R.