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How to get an identity matrix in R.?

Date: Fri-Jun-17-2016-
Response
0

> diag(rep(1,5))

     [,1] [,2]

[,3] [,4] [,5]

[1,]    1    0   

0    0    0

[2,]    0    1   

0    0    0

[3,]    0    0   

1    0    0

[4,]    0    0   

0    1    0

[5,]    0    0   

0    0    1

Date: Sat-Jun-18-2016
Response
0

> diag(rep(1,5))

     [,1] [,2]

[,3] [,4] [,5]

[1,]    1    0   

0    0    0

[2,]    0    1   

0    0    0

[3,]    0    0   

1    0    0

[4,]    0    0   

0    1    0

[5,]    0    0   

0    0    1

Date: Sat-Jun-18-2016
Response
0

I googled for this once upon a time and nothing came up. Hopefully this saves someone ten minutes of digging about in the documentation.

You make identity matrices with the keyword diag, and the number of dimensions in parentheses.

> diag(3)

[,1] [,2] [,3]

[1,] 1 0 0

[2,] 0 1 0

[3,] 0 0 1

Thatís it.

> diag(11)

[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [,11]

[1,] 1 0 0 0 0 0 0 0 0 0 0

[2,] 0 1 0 0 0 0 0 0 0 0 0

[3,] 0 0 1 0 0 0 0 0 0 0 0

[4,] 0 0 0 1 0 0 0 0 0 0 0

[5,] 0 0 0 0 1 0 0 0 0 0 0

[6,] 0 0 0 0 0 1 0 0 0 0 0

[7,] 0 0 0 0 0 0 1 0 0 0 0

[8,] 0 0 0 0 0 0 0 1 0 0 0

[9,] 0 0 0 0 0 0 0 0 1 0 0

[10,] 0 0 0 0 0 0 0 0 0 1 0

[11,] 0 0 0 0 0 0 0 0 0 0 1

But while I have your attention, letís do a couple mathematically interesting things with identity matrices.

[d] By: mintlysocial
Date: Fri-Dec-30-2016
Response
What is 1 + 100



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for restaurants, kiosk, and any other retails business completely free. It can be used as windows cashier system or as full blown POS. You will able to print to kitchen, display orders on the kitchen screen, manage inventory, employee, report, customer loyalty offers, employee management, delivery address track and much more, all for free.

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