The DERIVSIG function computes the standard deviation of a derivative as found by the DERIV function, using the input variables of DERIV and the standard deviations of those input variables.
This routine is written in the IDL language. Its source code can be found in the file derivsig.pro in the lib subdirectory of the IDL distribution.
Result = DERIVSIG( [X, Y, Sigx,] Sigy )
Returns the standard deviation of a derivative as found by the DERIV function.
Differentiate with respect to this variable. If omitted, unit spacing for Y (i.e., Xi = i) is assumed.
The variable to be differentiated. Omit if X is omitted.
The standard deviation of X (either vector or constant). Use “0.0” if the abscissa is exact; omit if X is omitted.
The standard deviation of Y. Sigy must be a vector if the other arguments are omitted, but may be either a vector or a constant if X, Y, and Sigx are supplied.
None.
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Pre 4.0 |
Introduced |