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Re: Delayed function does not behave as original input

  • To: mathgroup at smc.vnet.net
  • Subject: [mg97041] Re: Delayed function does not behave as original input
  • From: dh <dh at metrohm.com>
  • Date: Tue, 3 Mar 2009 05:57:18 -0500 (EST)
  • References: <godm4o$47b$1@smc.vnet.net>


Hi,

there is nothing wrong with your example. You must have fooled yourself, 

as you can see from the error message. Instead of feeding lists, you 

must have fed scalars: "52.25" and "2009" to rifle.

By the way, the "{1, -1, 2}" in Rifle is superfluous.

hope thias helps, Daniel



hayes.tyler at gmail.com wrote:

> Hello All:

> 

> I am trying to make a simple function to Riffle two lists together for

> a DateListPlot. I have attached an example below to show you what I am

> trying to do. Clearly, I am missing something basic here, but cannot

> seem to see what.

> 

> EXAMPLE CODE

> 

> close = {52.25`, 52.`, 52.01`, 52.06`, 52.14`, 52.45`, 52.06`, 51.89`,

>     52.06`, 52.05`};

> 

> dates = {{2009, 2, 26, 9, 30, 0}, {2009, 2, 26, 9, 31, 0}, {2009, 2,

>     26, 9, 32, 0}, {2009, 2, 26, 9, 33, 0}, {2009, 2, 26, 9, 34,

>     0}, {2009, 2, 26, 9, 35, 0}, {2009, 2, 26, 9, 36, 0}, {2009, 2,

>     26, 9, 37, 0}, {2009, 2, 26, 9, 38, 0}, {2009, 2, 26, 9, 39, 0}};

> 

> closedates = Partition[Riffle[close, dates, {1, -1, 2}], 2]

> 

> Out[178]= {{{2009, 2, 26, 9, 30, 0}, 52.25}, {{2009, 2, 26, 9, 31, 0},

>    52.}, {{2009, 2, 26, 9, 32, 0}, 52.01}, {{2009, 2, 26, 9, 33, 0},

>   52.06}, {{2009, 2, 26, 9, 34, 0}, 52.14}, {{2009, 2, 26, 9, 35, 0},

>   52.45}, {{2009, 2, 26, 9, 36, 0}, 52.06}, {{2009, 2, 26, 9, 37, 0},

>   51.89}, {{2009, 2, 26, 9, 38, 0}, 52.06}, {{2009, 2, 26, 9, 39, 0},

>   52.05}}

> 

> (* The above is what I want *)

> 

> dateDataMerge[datedata_, ordinatedata_] :=

>   Partition[Riffle[ordinatedata, datedata, {1, -1, 2}], 2];

> 

> closedatesbad = dateDataMerge[dates, close]

> 

> During evaluation of In[180]:= Riffle::list: List expected at position

> 1 in Riffle[52.25,2009,{1,-1,2}]. >>

> 

> During evaluation of In[180]:= Riffle::list: List expected at position

> 1 in Riffle[52.25,2009]. >>

> 

> During evaluation of In[180]:= Riffle::argtu: Riffle called with 1

> argument; 2 or 3 arguments are expected. >>

> 

> During evaluation of In[180]:= Riffle::list: List expected at position

> 1 in Riffle[52.25,2,{1,-1,2}]. >>

> 

> During evaluation of In[180]:= General::stop: Further output of

> Riffle::list will be suppressed during this calculation. >>

> 

> 

> END OF EXAMPLE CODE

> 

> Any help is appreciated.

> 

> Cheers,

> 

> t.

> 




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