interpolate_( i1 /*, t0, t, t1 */ ) {

		return this.copySampleValue_( i1 - 1 );

	}
Constructs a new discrete interpolant.

@param {TypedArray} parameterPositions - The parameter positions hold the interpolation factors.
@param {TypedArray} sampleValues - The sample values.
@param {number} sampleSize - The sample size
@param {TypedArray} [resultBuffer] - The result buffer.