NMRPipe Processing Functions
DX: Derivative by Central Difference.

DX performs a numerical derivative calculation on each vector. If the current dimension is complex, the real and imaginary parts are treated separately. For an N-point data vector y[0] ... y[N-1] the derivative dy[i] is calculated as:

 dy[0] = y[1] - y[0]

for the first point.

 dy[i] = y[i+1] - y[i-1]

for the interior points, and

 dy[N] = y[N] - y[N-1]

for the last point.

The nmrPipe function INTEG performs the numerical integral function, the complementary function to DX.

Frank Delaglio, Ph.D.