interface SparseMatrixData {
    _size: number[];
    _values?: unknown[];
    _index: number[];
    _ptr: number[];
}
/**
 * Find nonzero pattern of Cholesky L(k,1:k-1) using etree and triu(A(:,k))
 *
 * @param {Matrix}  a               The A matrix
 * @param {Number}  k               The kth column in A
 * @param {Array}   parent          The parent vector from the symbolic analysis result
 * @param {Array}   w               The nonzero pattern xi[top] .. xi[n - 1], an array of size = 2 * n
 *                                  The first n entries is the nonzero pattern, the last n entries is the stack
 *
 * @return {Number}                 The index for the nonzero pattern
 */
export declare function csEreach(a: SparseMatrixData, k: number, parent: number[], w: number[]): number;
export {};
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