import type { DoubleMatrix } from 'cheminfo-types';
/**
 * Correlates every column of a matrix against a single reference column.
 * @param matrix - 2D matrix with at least 2 rows
 * @param index - column index used as the reference signal. Defaults to `0`.
 * @returns array of Pearson correlations, one value per column
 */
export declare function matrixAutoCorrelation(matrix: DoubleMatrix, index?: number): Float64Array<ArrayBuffer>;
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