import type { DataReImMatrix } from '../types/index.ts';
export interface ReimMatrixFFTByColumnsOptions {
    inverse?: boolean;
    applyZeroShift?: boolean;
    /**
     * Write the result back into the input arrays instead of allocating new ones.
     * @default false
     */
    inPlace?: boolean;
}
/**
 * Apply FFT to each column of a complex matrix, reusing a single FFT instance for
 * all columns to avoid repeated instantiation overhead.
 * All columns must have the same length (all rows must have the same number of columns).
 * @param data - complex matrix with re and im arrays of Float64Array rows
 * @param options - options
 * @returns complex matrix with transformed columns
 */
export declare function reimMatrixFFTByColumns(data: DataReImMatrix, options?: ReimMatrixFFTByColumnsOptions): DataReImMatrix;
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