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transpose 1D array of leading dimension N


transpose 1D array of leading dimension N

By : Leonid Utyosov
Date : November 20 2020, 07:00 PM
fixed the issue. Will look into that further how can i transpose an 1d array of leading dimension N, without extra space ? any language is fine , My solution for 1D in-place Matrix transposition
code :


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Transpose a vector into the third dimension

Transpose a vector into the third dimension


By : Boy-From Galactic
Date : March 29 2020, 07:55 AM
wish help you to fix your issue The answer is to use the permute command:
code :
permute([1 2 3 4 5 6], [3 1 2])
MATLAB: why transpose single dimension array

MATLAB: why transpose single dimension array


By : Satrajit Das
Date : March 29 2020, 07:55 AM
wish helps you All "arrays" in MATLAB have at least two dimensions, and can be treated as having any number of dimensions you wish. The transpose operator here is converting between a row (size [1 N] array) and a column (size [N 1] array). This can be significant when it comes to either concatenating the arrays, or performing other operations.
Conceptually, the dimension vector of a MATLAB array has as many trailing 1s as is required to perform an operation. This means that you can index any MATLAB array with any number of subscripts, providing you don't exceed the bounds, like so:
code :
x = magic(4); % 4-by-4 square matrix
x(2,3,1,1,1) % pick an element
multiply numpy.array a with leading dimension of numpy.array b

multiply numpy.array a with leading dimension of numpy.array b


By : Rachana Chawda
Date : March 29 2020, 07:55 AM
To fix the issue you can do I have two numpy arrays, a and b, where a has dimension 1 and the same length as the leading dimension as b, e.g., , You could use
code :
 (a * b.T).T
(a*b.T).flags.contiguous
# False
(a*b.T).T.flags.contiguous
# True
How to transpose two-dimension arrays in PostgreSQL

How to transpose two-dimension arrays in PostgreSQL


By : Billythehobo
Date : March 29 2020, 07:55 AM
it should still fix some issue A table , A bit verbose but here it is
code :
SELECT array_agg(v ORDER BY j) matrix  FROM (
    SELECT rn, j, array_agg(v ORDER BY i) AS v FROM (
        SELECT rn, i, j, matrix[i][j] AS v FROM (
            SELECT generate_subscripts(matrix, 2) j, q.* FROM (
                SELECT ROW_NUMBER() OVER () AS rn,
                       generate_subscripts(matrix, 1) AS i, 
                       matrix                
                  FROM matrices
            ) q
        ) r
    ) s
     GROUP BY rn, j
) t
 GROUP BY rn
 ORDER BY rn;
CREATE OR REPLACE FUNCTION transpose_2d(anyarray)
RETURNS anyarray AS $$
SELECT array_agg(v ORDER BY j) matrix  FROM (
    SELECT j, array_agg(v ORDER BY i) AS v FROM (
        SELECT i, j, $1[i][j] AS v FROM (
            SELECT generate_subscripts($1, 2) j, q.* FROM (
                SELECT generate_subscripts($1, 1) AS i, $1
            ) q
        ) r
    ) s
     GROUP BY j
) t
$$ LANGUAGE sql IMMUTABLE;
SELECT transpose_2d(matrix) 
  FROM matrices;
       matrix
---------------------
 {{1,4},{2,5},{3,6}}
 {{a,d},{b,e},{c,f}}
(2 rows)
C++: Transpose of Matrix, using SINGLE DIMENSION dynamic array to save elements

C++: Transpose of Matrix, using SINGLE DIMENSION dynamic array to save elements


By : user3455838
Date : March 29 2020, 07:55 AM
With these it helps Dear Friends I am having problem to transpose a matrix. The transposed matrix has elements that are undefined. Not sure what is wrong. Thank you for your time! , When the matrix is not square, the line
code :
temp[(j - 1) * m + i - 1] = entries[(i - 1) * m + j - 1];
temp[(j - 1) * n + i - 1] = entries[(i - 1) * m + j - 1];
//            ^^ needs to be n, not m.
temp[j][i] = entries[i][j];
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