/**
 * Permutes a vector; x = P'b. In MATLAB notation, x(p)=b.
 *
 * @param {Array} p           The permutation vector of length n. null value denotes identity
 * @param {Array} b           The input vector
 *
 * @return {Array}            The output vector x = P'b
 */
export declare function csIpvec<T>(p: number[] | null, b: T[]): T[];
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