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 ... y[N-1] the derivative dy[i] is calculated as:
dy = y - yfor 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.