Re: Two different packages can not Need[] the same utility
- To: mathgroup at smc.vnet.net
- Subject: [mg79979] Re: [mg79867] Two different packages can not Need[] the same utility
- From: Carl Woll <carlw at wolfram.com>
- Date: Fri, 10 Aug 2007 01:42:54 -0400 (EDT)
- References: <200708070532.BAA12076@smc.vnet.net>
benedek.kovacs.mr at gmail.com wrote:
>Hi
>
>Here is a problem a I face with:
>I define two packages. Both needs the same
>Statistics`ContinuousDistibutions` package. However, the second one
>can not use it. Why? And how to resolve this problem?
>
>To make it more exact, in the following example I will define two
>packages: ff and gg with the corresponding f and g functions both
>using NormalDistribution. The first one evaluated works while the
>second does not. the problem is even more disappointing if we Get[]
>one packege twice and then are unable to use the function. More
>complicated verisions can appear using the Sytem` functions or using
>built-in packages where we does not even know what other packages are
>invited.
>
>Does anyone have a solution for this problem?
>
>Kind Regards
>Bence
>
>
I'll respond to the reason your code below generates error messages for
g[3]. Basically, you have:
g[x_,opts___]:=Random[(MyDistributionFunction/.{opts}/.Options[f])[x]]
Now, the fully qualified form of MyDistributionFunction here is
gg`Private`MyDistributionFunction
However, in Options[f]:
Options[f]:={MyDistributionFunction -> (NormalDistribution[#, 0.2 #]&)}
the fully qualified form of MyDistributionFunction is
ff`Private`MyDistributionFunction.
Hence, Options[f] will not replace anything, and you get an error
message. One solution to this problem is to use a string instead of a
symbol.
As for the problem you describe above dealing with the
Statistics`ContinuousDistributions` package, a nonworking example would
be helpful.
Carl Woll
Wolfram Research
>In[1]:=BeginPackage["ff`"]
>Out[1]=ff`
>In[2]:=Unprotect[f]
>Out[2]={}
>In[3]:=Begin["`Private`"]
>Out[3]=ff`Private`
>In[4]:=Needs["Statistics`ContinuousDistributions`"]
>In[5]:=Options[f]:={MyDistributionFunction\[Rule](NormalDistribution[#,
>0.2 #]&)}
>f[x_,opts___]:=Random[(MyDistributionFunction/.{opts}/.Options[f])[x]]
>In[7]:=End[]
>Out[7]=ff`Private`
>In[8]:=Protect[f]
>Out[8]={f}
>In[9]:=EndPackage[]
>
>In[10]:=f[3]
>Out[10]=2.16487
>In[11]:=ff`f[3]
>Out[11]=4.16217
>
>In[12]:=BeginPackage["gg`"]
>Out[12]=gg`
>In[13]:=Unprotect[g]
>Out[13]={}
>In[14]:=Begin["`Private`"]
>Out[14]=gg`Private`
>In[15]:=Needs["Statistics`ContinuousDistributions`"]
>In[16]:=Options[g]:={MyDistributionFunction\[Rule]
>(NormalDistribution[#,0.2 #]&)}
>g[x_,opts___]:=Random[(MyDistributionFunction/.{opts}/.Options[f])[x]]
>In[18]:=End[]
>Out[18]=gg`Private`
>In[19]:=Protect[g]
>Out[19]={g}
>In[20]:=EndPackage[]
>
>In[21]:=f[3]
>Out[21]=2.88763
>In[22]:=ff`f[3]
>Out[22]=3.09767
>
>In[23]:=g[3]
>>From In[23]:=\!\(\*
> RowBox[{\(Random::"randt"\), \(\(:\)\(\ \)\), "\<\"Type
>specification \\!\\(
> gg`Private`MyDistributionFunction[3]\\) in \
>\\!\\(Random[\\(\\(gg`Private`MyDistributionFunction[3]\\)\\)]\\)
>should be \
>Real, Integer, or Complex. \\!\\(\\*ButtonBox[\\\"More...\\\", \
>ButtonStyle->\\\"RefGuideLinkText\\\", ButtonFrame->None, \
>ButtonData:>\\\"Random::randt\\\"]\\)\"\>"}]\)
>Out[23]=Random[gg`Private`MyDistributionFunction[3]]
>In[24]:=gg`g[3]
>>From In[24]:=\!\(\*
> RowBox[{\(Random::"randt"\), \(\(:\)\(\ \)\), "\<\"Type
>specification \\!\\(
> gg`Private`MyDistributionFunction[3]\\) in \
>\\!\\(Random[\\(\\(gg`Private`MyDistributionFunction[3]\\)\\)]\\)
>should be \
>Real, Integer, or Complex. \\!\\(\\*ButtonBox[\\\"More...\\\", \
>ButtonStyle->\\\"RefGuideLinkText\\\", ButtonFrame->None, \
>ButtonData:>\\\"Random::randt\\\"]\\)\"\>"}]\)
>Out[24]=Random[gg`Private`MyDistributionFunction[3]]
>
>
>
- References:
- Two different packages can not Need[] the same utility package?
- From: "benedek.kovacs.mr@gmail.com" <benedek.kovacs.mr@gmail.com>
- Two different packages can not Need[] the same utility package?