1 2\function{rearrange} 3\synopsis{Rearrange the elements of a 1-d array or list.} 4\usage{rearrange (A, indices)} 5\description 6 This function performs an in-place rearrangment of the the elements 7 of an array according to the specified permutation, represented by 8 the \exmp{indices} argument. The \exmp{indices} array is assumed to 9 contain unique integers in the range \exmp{[0,length(A)-1]}. 10\notes 11 The function modifies the elements of the \exmp{indices} array while 12 it performs the rearrangement. The values will get restored upon 13 return from function. 14 15 The algorithm used was derived from the DPPERM function, which is 16 part of the SLATEC package. See 17 \url{http://gams.nist.gov/cgi-bin/serve.cgi/Package/SLATEC}. 18\seealso{array_reverse, array_swap} 19\done 20 21\function{reverse} 22\synopsis{Reverse the elements of a 1-d array} 23\usage{Array_Type reverse (Array_Type A)} 24\description 25 The \sfun{reverse} function reverses the elements of a 1-d array and 26 returns the result. 27\seealso{shift} 28\done 29 30\function{shift} 31\synopsis{Shift the elements of a 1-d array} 32\usage{Array_Type shift (Array_Type A, Int_Type n)} 33\description 34 The \sfun{shift} function shifts the elements of an array by a specified amount 35 and returns the result. If \exmp{n} is positive, the ith element of the array 36 will be shifted to the position \exmp{i-n} of the array. Elements for 37 which \exmp{i-n} is less than 0 will be moved to the end of the array. 38\example 39#v+ 40 A = [1,2,3,4,5,6,7,8,9]; 41 B = shift (A, 3); % ==> B = [4,5,6,7,8,9,1,2,3]; 42 C = shift (A, -1); % ==> C = [9,1,2,3,4,5,6,7,8]; 43#v- 44\notes 45 It many ways \exmp{rotate} would be a better name for this function. 46\seealso{reverse, transpose} 47\done 48