The first input must be a vector. The first input must be real. The first and second inputs must be of type double or single. The interpolation points must be of type double or single. The interpolation points must be real. The first two inputs must have at least two elements. The first input must contain unique values. The endslopes cannot be NaN. The endslopes cannot be Inf. The number of sample points X, {0,number,integer}, is incompatible with the number of values Y, {1,number,integer}. All NaN entries in the first and second input were ignored.