Type help interp1q at the command line for more information.Įxample 1. For interp1q to work properly, x must be a monotonically increasing column vector and Y must be a column vector or matrix with length(X) rows. Note interp1q is quicker than interp1 on non-uniformly spaced data because it does no input checking. Described in table lookup terms, the table is and interp1 looks up the elements of xi in x, and, based upon their locations, returns values yi interpolated within the elements of Y. Interpolation is the same operation as table lookup.
This function is shown below, along with the relationship between vectors x, Y, xi, and yi. It finds values at intermediate points, of a one-dimensional function that underlies the data. The interp1 command interpolates between data points. You can use any of the methods in the preceding table, except for 'v5cubic'. Pp = interp1(x,Y,method,'pp') uses the specified method to generate the piecewise polynomial form (ppform) of Y. Returns the scalar extrapval for out of range values. Uses the specified method to perform extrapolation for out of range values. For all other methods, interp1 performs extrapolation for out of range values. Īssumes that x = 1:N, where N is the length of Y for vector Y, or size(Y,1) for matrix Y.įor the 'nearest', 'linear', and 'v5cubic' methods, interp1(x,Y,xi,method) returns NaN for any element of xi that is outside the interval spanned by x. If xi is an array of size, yi has size.If xi is a scalar or vector, size(yi) equals.The sizes of xi and yi are related as follows: The interpolation is performed for each d1-by- d2-by-.- dk value in Y. If Y is an array that is not a vector, the size of Y must have the form, where n is the length of x.xi can be a scalar, a vector, or a multidimensional array, and yi has the same size as xi. A scalar value for x or Y is expanded to have the same length as the other. If Y is a scalar or vector, it must have the same length as x.Y can be a scalar, a vector, or an array of any dimension, subject to the following conditions: Yi = interp1(x,Y,xi) interpolates to find yi, the values of the underlying function Y at the points in the vector or array xi. One-dimensional data interpolation (table lookup) Interp1 (MATLAB Functions) MATLAB Function Reference
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