http://www.mapleprimes.com/posts/41183-Tip-Transpose-A-Pair-Of-Indices-Of-An-Array en-us 2026 Maplesoft, A Division of Waterloo Maple Inc. Maplesoft Document System Sat, 13 Jun 2026 18:17:01 GMT Sat, 13 Jun 2026 18:17:01 GMT The latest comments added to the Post, Tip: Transpose a pair of indices of an Array http://www.mapleprimes.com/images/mapleprimeswhite.jpg http://www.mapleprimes.com/posts/41183-Tip-Transpose-A-Pair-Of-Indices-Of-An-Array http://www.mapleprimes.com/posts/41183-Tip-Transpose-A-Pair-Of-Indices-Of-An-Array?ref=Feed:MaplePrimes:Tip: Transpose a pair of indices of an Array:Comments#comment76540 John, Thanks for the posts. You seem to be very knowledgeable of arrays, so I would like to ask if you can provide an answer or post on a question I've been nagging mapleprimes users on for a while. Can you elaborate on the difference between a matrix and an array with respect to Maple ? Guidance welcomed, Respectfully, The latest comments added to the Post, Tip: Transpose a pair of indices of an Array 76540 Fri, 29 Jun 2007 18:50:29 Z dcasimir dcasimir http://www.mapleprimes.com/posts/41183-Tip-Transpose-A-Pair-Of-Indices-Of-An-Array?ref=Feed:MaplePrimes:Tip: Transpose a pair of indices of an Array:Comments#comment76539 Just looking for clarification. Your post's title had the names capitalized, but the post did not. acer The latest comments added to the Post, Tip: Transpose a pair of indices of an Array 76539 Fri, 29 Jun 2007 19:13:13 Z acer acer http://www.mapleprimes.com/posts/41183-Tip-Transpose-A-Pair-Of-Indices-Of-An-Array?ref=Feed:MaplePrimes:Tip: Transpose a pair of indices of an Array:Comments#comment76538 Why not permute directly with the Array constructor? B := Array(rtable_dims(A),(i,j,k)->A[i,k,j]); acer The latest comments added to the Post, Tip: Transpose a pair of indices of an Array 76538 Fri, 29 Jun 2007 19:30:04 Z acer acer http://www.mapleprimes.com/posts/41183-Tip-Transpose-A-Pair-Of-Indices-Of-An-Array?ref=Feed:MaplePrimes:Tip: Transpose a pair of indices of an Array:Comments#comment85349 Matrices have two dimensions, i.e., two indices uniquely identifies a given entry. Arrays, on the hand, may be multi-dimensional, i.e., having more than two dimensions (note that Arrays may also have one or two dimensions, so you can say that an Array is a generalization of a Matrix). An example is the following: <pre> A := Array(1..2,1..3,1..4,(i,j,k)->i*j-k^2); </pre> where examples of entries are <pre> A[1,2,3]; # Equals 1*2-3^2 A[2,1,4]; # Equals 2*1-4^2 -7 -14 </pre> The latest comments added to the Post, Tip: Transpose a pair of indices of an Array 85349 Fri, 29 Jun 2007 19:31:05 Z John Fredsted John Fredsted http://www.mapleprimes.com/posts/41183-Tip-Transpose-A-Pair-Of-Indices-Of-An-Array?ref=Feed:MaplePrimes:Tip: Transpose a pair of indices of an Array:Comments#comment85348 There seems to be a problem with your interesting proposal: <pre> A := Array(1..2,1..3,1..4,(i,j,k)->i*j-k^2); B := Array(rtable_dims(A),(i,j,k)->A[i,k,j]); Error, Array index out of range </pre> The latest comments added to the Post, Tip: Transpose a pair of indices of an Array 85348 Fri, 29 Jun 2007 19:37:06 Z John Fredsted John Fredsted http://www.mapleprimes.com/posts/41183-Tip-Transpose-A-Pair-Of-Indices-Of-An-Array?ref=Feed:MaplePrimes:Tip: Transpose a pair of indices of an Array:Comments#comment85347 It is no wonder that there is a problem; the dimensionalities of A are incompatible. The latest comments added to the Post, Tip: Transpose a pair of indices of an Array 85347 Fri, 29 Jun 2007 19:39:12 Z John Fredsted John Fredsted