Function to interpolate fill %nan values in data matrix
[data_filled]=forwardfill(data); [data_filled]=forwardfill(data, int_method); [data_filled]=forwardfill(data, int_method, ext_method);
n x m matrix of numeric data, with matrix of column vectors, where %nan values of input matrix have been backfilled
n x m matrix of numeric data, with matrix of column vectors
string variable identifying the interpolation method, default "linear"
string variable identifying the extrapolation method, default "linear"