V6 evaluation inside Table and plot
- To: mathgroup at smc.vnet.net
- Subject: [mg76577] V6 evaluation inside Table and plot
- From: Gerry Flanagan <flanagan at materials-sciences.com>
- Date: Thu, 24 May 2007 06:04:47 -0400 (EDT)
Define a simple function
In[7]:= f = Function[{x}, x^3]
Out[7]= Function[{x}, x^3]
Taking two derivatives works as it should
In[2]:= f''[x]
I was converting some packages to work with V6, and immediately ran into
some evaluation issues I don't understand. It looks like forms like
f''[x] (derivative) are evaluated differently inside of Table and Plot
than outside.
Out[2]= 6 x
But this does not?
In[20]:= Table[f''[x], {x, 0, 1, .2}]
Out[20]= {0, 0, 0, 0, 0, 0}
Strangely, this works
In[4]:= Table[f'[x], {x, 0, 1, .2}]
Out[4]= {0., 0.12, 0.48, 1.08, 1.92, 3.}
Determining the derivative outside the Table makes it work again.
In[12]:= g = f'';
In[21]:= tmp = Table[g[x], {x, 0, 1, .2}]
Out[21]= {0., 1.2, 2.4, 3.6, 4.8, 6.}
Gerry Flanagan
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- Re: V6 evaluation inside Table and plot