Module: LayoutCSR¶

class CSR¶

This CSR layout provides a Compressed Sparse Row implementation for Chapel’s sparse domains and arrays.

To declare a CSR domain, invoke the CSR constructor without arguments in a dmapped clause. For example:

use LayoutCSR;
var D = {1..n, 1..m};  // a default-distributed domain
var CSR_Domain: sparse subdomain(D) dmapped CSR();

To declare a CSR array, use a CSR domain, for example:

// assume the above declarations
var CSR_Array: [CSR_Domain] real;

This domain map is a layout, i.e. it maps all indices to the current locale. All elements of a CSR-distributed array are stored on the locale where the array variable is declared.