Re: multiple variables in pure function used in map.
- To: mathgroup at smc.vnet.net
- Subject: [mg107650] Re: multiple variables in pure function used in map.
- From: Bill Rowe <readnews at sbcglobal.net>
- Date: Sun, 21 Feb 2010 04:25:50 -0500 (EST)
On 2/20/10 at 6:38 AM, pipehappy at gmail.com (pipehappy) wrote:
>Is there a way to use multiple variables in pure function with map.
>What I want to do is like this:
>ab = {{1, 2}, {2, 3}, {3, 4}}; (#[[1]] + #[[2]]) & /@ ab {3, 5, 7}
>Instead of refer to elements in list I want to use multiple
>variables in pure function.
>something like this: ab = {{1, 2}, {2, 3}, {3, 4}}; (#1 + #2) & /@
>ab To do the same thing as the above example.
Use Apply. For example,
In[5]:= Plus @@ # & /@ ab
Out[5]= {3,5,7}
Or perhaps better, dispense with Map and do
In[6]:= Plus @@@ ab
Out[6]= {3,5,7}
Or
In[7]:= Apply[Plus, ab, {1}]
Out[7]= {3,5,7}