Group Abstract

Message Boards

WOLFRAM COMMUNITY

9.5K Views

6 Replies

6 Total Likes

View groups...

Follow this post

Share this post:

GROUPS:

Wolfram Language equivalent to Matlab Rot90?

Paul Davidson

Posted 10 years ago

Does anyone know if there is there a wolfram equivalent for the Matlab command Rot90 ? B = rot90(A) rotates array A counterclockwise by 90 degrees. For multidimensional arrays, rot90 rotates in the plane formed by the first and second dimensions. B = rot90(A,k) rotates array A counterclockwise by k*90 degrees, where k is an integer.

POSTED BY: Paul Davidson

6 Replies

Sort By:

Sander Huisman

Sander Huisman, University of Twente

Posted 10 years ago

POSTED BY: Sander Huisman

Paul Davidson

Posted 10 years ago

Thank you evryone for your comments but special thanks to Sander for such a simple solution.

POSTED BY: Paul Davidson

Sander Huisman

Sander Huisman, University of Twente

Posted 10 years ago

This is not what the OP asks for. Rot90 'rotates' a matrix in 90 degree steps (http://fr.mathworks.com/help/matlab/ref/rot90.html). Not rotation like Rotate, RotationTransform, RotationMatrix.

POSTED BY: Sander Huisman

Sander Huisman

Sander Huisman, University of Twente

Posted 10 years ago

As David said it is very easy to do so: rotccw = Reverse@Transpose; ( defines a function to do counterclockwise rotation ) rotcw = Transpose@Reverse; (* and clockwise rotation *) a = Partition[Range[16], 4]; MatrixForm[a] MatrixForm[rotcw[a]] MatrixForm[rotccw[a]]

As David said it is very easy to do so:

rotccw = Reverse@*Transpose; (* defines a function to do counterclockwise rotation *)
rotcw = Transpose@*Reverse;  (* and clockwise rotation *)

a = Partition[Range[16], 4];
MatrixForm[a]
MatrixForm[rotcw[a]]
MatrixForm[rotccw[a]]

POSTED BY: Sander Huisman