Borrar filtros
Borrar filtros

Sparse Matrix, struct, structure, Using cell arrays

40 visualizaciones (últimos 30 días)
Abhishek Gupta
Abhishek Gupta el 30 de Oct. de 2020
Respondida: Abhishek Gupta el 30 de Oct. de 2020
A sparse matrix is a large Matrix with almost all elements of the same value (typically zero). The normal representation of a spark Matrix takes up lots of memory when useful information can be captured with much less. A possible way to represent a sparse matrix is with a cell vector whose first element is a 2-element vector representing the size of the sparse matrix. The second element is a scalar specifying the default value of the sparse matrix. Each successive element of the cell vector is a 3-element vector representing one element of sparse matrix that has a value other than default. The three elements row index, the column index and the actual value. Write a function called sparse2matrix that takes a single input of a cell vector as defined above and returns the output argument called matrix, the matrix in its traditional form. Consider the following run:
cellvec = {[2 3], 0, [1 2 3], [2 2 -3]};
matrix = sparse2matrix(cellvec)
matrix =
0 3 0
0 -3 0

Respuesta aceptada

Abhishek Gupta
Abhishek Gupta el 30 de Oct. de 2020
function matrix=sparse2matrix(cellvec)
[m n]=size(cellvec);
for i=3:n

Más respuestas (1)

Aramis el 7 de Mayo de 2024
function matrix = sparse2matrix(cellvec)
matrix = ones(cellvec{1}) * cellvec{2};
for x=3:length(cellvec)
matrix(cellvec{x}(1),cellvec{x}(2)) = cellvec{x}(3);


Más información sobre Sparse Matrices en Help Center y File Exchange.

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by