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Hi, In MKL documentaion (http://software.intel.com/sites/products/documentation/hpc/mkl/mklman/GUID-78250DC6-6203-42B5-B46E-638CE1BC5D88.htm#TBL17-8), 'Boundary Conditions Supported by Data Fitting Functions' says 'DF_BC_1ST_LEFT_DER' is 'The first derivative at the left endpoint is zero.'. Then what does this 'is zero' mean ?

I actually tried NATURAL spline with DF_BC_1ST_LEFT_DER|DF_BC_1ST_RIGHT_DER options(etc),and got different results for non zero boundary values.

I also tried LINEAR spline with/without PERIODIC option, and it showed no difference even in the region outside of specified x-range.

# I got these results from 'Math Kernel Library Version 10.3.11 Product Build 20120606 for 32-bit applications' on Windows 7.

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