NAG Library Manual, Mark 28.3
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NAG CL Interface Introduction
Example description

nag_fit_dim2_spline_derivm (e02dhc) Example Program Results

Spline fit used smoothing factor s =    1.0000e-01.
Number of knots in each direction  =    10,   13.

Sum of squared residuals           =    1.0004e-01.

Derivative of spline has order nux, nuy =    1,     0.

 Spline evaluated on X-Y grid (X across, Y down):
          0.00     1.00     2.00     3.00     4.00     5.00
 0.00    0.992    2.043    3.029    4.014    5.021    5.997
 1.00    0.541    1.088    1.607    2.142    2.705    3.239
 2.00   -0.417   -0.829   -1.241   -1.665   -2.083   -2.485
 3.00   -0.978   -1.975   -2.914   -3.913   -4.965   -5.924
 4.00   -0.648   -1.363   -1.991   -2.606   -3.251   -3.933

 Spline derivative evaluated on X-Y grid:
          0.00     1.00     2.00     3.00     4.00     5.00
 0.00    1.093    1.013    0.970    1.004    1.001    0.939
 1.00    0.565    0.531    0.515    0.558    0.559    0.499
 2.00   -0.429   -0.404   -0.421   -0.423   -0.412   -0.389
 3.00   -1.060   -0.951   -0.949   -1.048   -1.031   -0.861
 4.00   -0.779   -0.661   -0.608   -0.628   -0.663   -0.701