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Time derivative

DF = **timederivativef**(F) returns the time derivative (central finite
difference) of the vector/scalar fields F. The time unit is not taken
into account here: the resulting field DF has same unit as the input
field F (use operf('/',DF,DT) to obtain a proper time derivative).
DF = **timederivativef**(F, N) specifies the order:
N=2: (Default Value): second-order central difference, with single
sided differences for the 1st and last frame (similar to
Matlab's GRADIENT function). One has LENGTH(DF) = LENGTH(F).
N=1: first-order finite difference (similar to Matlab's DIFF function).
One has LENGTH(DF) = LENGTH(F)-1.

**Example**
v = loadvec('*.vc7');
showf(**timederivativef**(v));

**See Also**
smoothf.
Published output in the Help browser
showdemo **timederivativef**

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