Wrong number of input arguments. Use 4 inputs for PP=INTERP1(X,V,METHOD,''pp''). ''pp'' option not supported for modified Akima cubic interpolation. X must be a vector. X and V must be of the same length. LENGTH(X) and SIZE(V,1) must be the same. A minimum of two data points is required. Invalid interpolation method. Invalid character vector argument. Did you mean ''pp'' or ''extrap''? EXTRAP option must be a scalar. X must be a vector of type double or single. Values V must be of type double or single. An interpolation method must be specified with ''extrap''. Columns of data containing NaN values have been ignored during interpolation. The 'cubic' and 'v5cubic' methods do not support extrapolation. X should be a real vector. The interpolation points Xq should be real. NaN is not an appropriate value for X. The values of X should be distinct. Invalid extrap option. NaN found in V, interpolation at undefined values will result in undefined values. INTERP1(...,'next','PP') is not supported. Use GRIDDEDINTERPOLANT instead. INTERP1(...,'previous','PP') is not supported. Use GRIDDEDINTERPOLANT instead.