I am writing a command-line C program to perform cubic-pline interpolation on large data files.  Each line of the ASCII files will have: x-value,y-value.  The values will be converted to long doubles via _atold and then put into separate x-arrays and y-arrays.

I can probably eventually write code to properly input the data, but I am hoping someone already has a solid routine for doing it.

Thanks in advance for your help.

rvw