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}

```

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