One-dimensional linear interpolation without error checking. Interpolates y, defined at the points x, at the points xi. The sample points x must be a strictly monotonically increasing column vector. If y is an array, treat the columns of y separately. If y is a vector, it must be a column vector of the same length as x.
Values of xi beyond the endpoints of the interpolation result in NA being returned.
Note that the error checking is only a significant portion of the execution time of this
interp1
if the size of the input arguments is relatively small. Therefore, the benefit of usinginterp1q
is relatively small.See also: interp1