/**
 * Data operation utilities for multi-dimensional arrays
 * Handles array traversal, selection, slicing, and mathematical operations
 */
import { NDArray } from '../types.js';
/**
 * Sum all values in N-dimensional array without flattening - O(n) time, O(1) extra space
 */
export declare function sumAll(data: NDArray): number;
/**
 * Count all elements in N-dimensional array without flattening - O(n) time, O(1) extra space
 */
export declare function countAll(data: NDArray): number;
/**
 * Divide all values in an N-dimensional array by a scalar
 */
export declare function divideArray(data: NDArray, divisor: number): NDArray;
/**
 * Apply element-wise operation between two arrays of matching shapes
 */
export declare function elementWiseOp(a: any, b: any, op: (x: number, y: number) => number): any;
/**
 * Reshape array by removing dimensions of size 1
 */
export declare function reshapeSqueezed(data: NDArray, squeezedDims: number[]): NDArray;
/**
 * Select a single index along a specific dimension
 * Returns a lower-dimensional array (dimension is dropped)
 */
export declare function selectAtDimension(data: any, dimIndex: number, index: number): any;
/**
 * Select multiple indices along a specific dimension
 * Returns an array with the same number of dimensions
 */
export declare function selectMultipleAtDimension(data: any, dimIndex: number, indices: number[]): any;
/**
 * Slice a range along a specific dimension
 */
export declare function sliceAtDimension(data: any, dimIndex: number, start: number, stop: number): any;
/**
 * Reduce along a dimension using a reducer function
 * Used for operations like sum, mean, max, min, etc.
 */
export declare function reduceAlongDimension(data: NDArray, dimIndex: number, dims: string[], coords: {
    [key: string]: any[];
}, reducer: (acc: number, val: number) => number): any;
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