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MathGroup Archive 2007

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Re: Map vs. Table

  • To: mathgroup at smc.vnet.net
  • Subject: [mg75387] Re: Map vs. Table
  • From: dh <dh at metrohm.ch>
  • Date: Sat, 28 Apr 2007 05:51:40 -0400 (EDT)
  • References: <f0sfrs$ncb$1@smc.vnet.net>


Hi Istvan,

here is a Map solution:

i=0; ({++i,#})&/@ data

However, I can not verify that this is much faster.

hope this helps, Daniel



zac wrote:

> Dear Group,

> 

> consider a set of data (y values):

> 

> data = Table[i*j, {i, 5}, {j, 10}]

> 

> I want to label each Integer with an x value:

> 

> label := Table[{i, #} & /@ data[[i]], {i, Length[data]}]

> 

> I've understand that list creation is much faster with Map than with

> Table.

> Is there an effective way to convert the Table to Map in the label

> function (either with nested Map or to incorporate the Table function

> into the Map)?

> Would it be really faster for very large datasets than with Table?

> 

> thanks

> 

> Istvan Zachar

> 

> 




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