DERIVSIG
Syntax | Return Value | Arguments | Keywords | Version History | See Also
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.
Syntax
Result = DERIVSIG( [X, Y, Sigx,] Sigy )
Return Value
Returns the standard deviation of a derivative as found by the DERIV function.
Arguments
X
Differentiate with respect to this variable. If omitted, unit spacing for Y (i.e., Xi = i) is assumed.
Y
The variable to be differentiated. Omit if X is omitted.
Sigx
The standard deviation of X (either vector or constant). Use "0.0" if the abscissa is exact; omit if X is omitted.
Sigy
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.
Keywords
None.
Version History
