Error when using smooth.spline
When trying to interpolate a series of data the cubic spline is a great technique to be used. I choose to use the smooth.spline function, from the R stats package. > smooth.spline(data$x, data$y ) Nevertheless, while running smooth.spline on a collection of datasets with different sizes I got the following error: Error in smooth.spline( data$x, data$y), : 'tol' must be strictly positive and finite After digging a little bit I discovered that the problem was that some datasets were really small and smooth.spline wasn't being able to compute anything. Hence, make sure your dataset is big enough before applying smooth.spline to it. > if(length(data$x) > 30) { smooth.spline( data$x, data$y) } UPDATE: A more generalized solution would be: > if(IQR(data$x) > 0) { smooth.spline( data$x, data$y) }