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MathGroup Archive 2004

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RE: Applying my function to elements of a vector

  • To: mathgroup at smc.vnet.net
  • Subject: [mg49492] RE: [mg49464] Applying my function to elements of a vector
  • From: "David Park" <djmp at earthlink.net>
  • Date: Thu, 22 Jul 2004 02:44:59 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Gregory,

The easiest method to do this on the fly is to Map f onto the list.

f /@ {a, b, c, d}
{f[a], f[b], f[c], f[d]}

Or you could make f Listable just as most Mathematica functions are.

Attributes[f] = {Listable};

f[{a, b, c, d}]
{f[a], f[b], f[c], f[d]}

David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/ 


From: Gregory Lypny [mailto:gregory.lypny at videotron.ca]
To: mathgroup at smc.vnet.net

Hello everyone,

Say I've created a function, f[x_], which accepts a single scalar as 
its argument.  I now want to apply that function to each element of a 
vector, v, of length n, as in

	newVector = f[v],

but I get an error because my function f does not thread over the 
elements of the vector as do built-in Mathematica functions such as 
Log[].  How can I get my function to apply to each element of my 
vector?

	Regards,

		Greg




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