Object can later be used with ppval to evaluate the interpolation. If the string argument "pp" is specified, then xi should notīe supplied and interp1 returns a piecewise polynomial object. Number, then replace values beyond the endpoints with that number. If extrap is the string "extrap", then extrapolate valuesīeyond the endpoints using the current method.
This is usually faster,Īnd is never slower. To assume that x is uniformly spaced, and only x(1)Īnd x(2) are referenced. Interpolation with smooth first derivative.Ĭubic spline interpolation-smooth first and second derivativesĪdding ’*’ to the start of any method above forces interp1 Piecewise cubic Hermite interpolating polynomial-shape-preserving Linear interpolation from nearest neighbors. If y is a matrix or an N-dimensionalĪrray, the interpolation is performed on each column of y. If not specified, x is taken to be the indices of y Interpolate input data to determine the value of yi at the points : yi = interp1 ( x, y, xi) : yi = interp1 ( y, xi) : yi = interp1 (…, method) : yi = interp1 (…, extrap) : yi = interp1 (…, "left") : yi = interp1 (…, "right") : pp = interp1 (…, "pp")
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