| Author |
Comment/Response |
jf
|
 12/13/12 12:19pm
On the reference page for D, look in the "See Also" section at the bottom.
In[1]:= ?Derivative
f' represents the derivative of a function f of one argument.
Derivative[n1, n2, ..][f] is the general form, representing a function obtained
from f by differentiating n1 times with respect to the first argument, n2
times with respect to the second argument, and so on.
A one-argument function. Take first derivative and evaluate at x=2.2.
In[2]:= f[x_]:= Sin[x]/x
In[3]:= f'[2.2]
Out[3]= -0.434545
A two-argument function. Take first derivative with respect to the second argument then evaluate at {3, 2.7}.
In[4]:= Derivative[0,1][BesselJ][3,2.7]
Out[4]= 0.187289
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