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So here is my problem. I am writing a software with mathematica, that uses an external package as a resource. They are some libraries for numerical integration, the CUBA libraries. http://www.feynarts.de/cuba/ The name of the function I use is Suave. It is essentially a better version of NIntegrate. Like NIntegrate, it has several options. Now, as I use it many times in my code, and always using the same options, I found this way to save the options and then plug them in at each use

$CUBAOptions={PrecisionGoal->$cubaintegralprecision,AccuracyGoal->$cubaintegralaccuracy,MinPoints->$MinPointsCUBA,MaxPoints->$MaxPointsCUBA,Verbose->$SOutput,PseudoRandom->$PseudoRandomC,Compiled->$CompiledC};

$SSpecOptions={NNew->$NIncreaseS/10,Flatness->$FlatnessS};

$SOptions=Join[$CUBAOptions,$SSpecOptions];

Install["Suave"];

MyFunctionS[m_]:=Suave[Integrand[r,Eu,s,t,m],{r,ereg,rmax},{Eu,1,EumaxE[muf[r],B[r],meff[r]]},{s,sminE[Eu,m,B[r],meff[r]],smaxE[Eu,m,B[r],meff[r]]},{t,tminE[s,m,meff[r],muf[r]],tmaxE},##&@@$SOptions];

where the last line is present many times in the code, this is just one of the repeated used, all similar.

Now with this approach, I get some shadowing warning messages when I load the code with definitions (not when I use it, just on load). It says that the option names (like Flatness, NNew and so on...are present both in global and in CUBA context.

I hoped I could solve the problem by just inserting e "remove" before "Install", but after I do that, I get another problem

Message[Suave::optx, Removed["Flatness"], Suave]

Any suggestion on how to deal with this issue? I would like to still be able to define the options in a central, compact way, but without incurring in shadowing problems.

EDIT: I forgot to clarify a couple of differences between CUBA/Suave and NIntegrate.

This code works with NIntegrate:

MyOptions={"AccuracyGoal"->1};
NIntegrate[1,{x,0,1}, Evaluate@MyOptions]

However the following 3 examples do NOT work with Suave

MyOptions={"AccuracyGoal"->1};
Suave[1,{x,0,1}, Evaluate@MyOptions]
Suave[1,{x,0,1},{AccuracyGoal->1}]
Suave[1,{x,0,1},"AccuracyGoal"->1]

The first two just return as output the input function, unevaluated. The third one says unknown option

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  • $\begingroup$ You don't have to use ##&, there is Sequence. Also you can usually just pass in the options as a list and it works just fine. $\endgroup$
    – Jason B.
    Commented May 21, 2021 at 1:26
  • $\begingroup$ For the option names just use strings like "NNew", they will work just the same. But if symbols like $cubaintegralprecision are defined in the package you need to use their fully-qualified name - including context. $\endgroup$
    – Jason B.
    Commented May 21, 2021 at 2:28
  • $\begingroup$ it does not seem that easy. There are 2 problems/differences between Suave and NIntegrate. For Nintegrate I can write NIntegrate[1,{x,0,1},Evaluate@MyOptions], Where MyOptions={"option1"->value1}; For Suave this does not work. First, it seems not to accept options in a list, like Suave[1,{x,0,1},{option1->value1}]. Second, It does not recognise the option if it is inside "", like Suave[1,{x,0,1},"AccuracyGoal"->3]. Could you give an example of code that solves these problems? $\endgroup$
    – Giorgio Busoni
    Commented May 21, 2021 at 9:23
  • $\begingroup$ It might be that the "Suave" package is older and does not use the OptionsPattern and OptionValue functions that make everything work like I describe above. If you evaluate Install["Suave"]; first before reading in the definitions of $SOptions, then everything works correctly is that right? $\endgroup$
    – Jason B.
    Commented May 21, 2021 at 11:53
  • $\begingroup$ Run Install (which effectively "loads" the package) before using any CUBA-provided option names. It appears to me that this is a case of trying to use a package before having loaded it, except that the concept of "loading" is a bit unusual in this case (done through Install). $\endgroup$
    – Szabolcs
    Commented May 21, 2021 at 11:59

1 Answer 1

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I finally found the solution All this code is wrapped inside a big If. I downlaoded the source code of the package and I found some example notebook that were setting option using SetOptions. I tried to do that both before

If[$useCUBA,
$CUBAOptions={PrecisionGoal->$cubaintegralprecision,AccuracyGoal->$cubaintegralaccuracy};
$SSpecOptions={NNew->$NIncreaseS/10,Flatness->$FlatnessS};
$SOptions=Join[$CUBAOptions,$SSpecOptions];

SetOptions[Suave,$SOptions];

Install["Suave"];

MyFunctionS[m_]:=Suave[Integrand[r,Eu,s,t,m],{r,ereg,rmax},{Eu,1,EumaxE[muf[r],B[r],meff[r]]},{s,sminE[Eu,m,B[r],meff[r]],smaxE[Eu,m,B[r],meff[r]]},{t,tminE[s,m,meff[r],muf[r]],tmaxE}];

];

and after install

If[$useCUBA,
$CUBAOptions={PrecisionGoal->$cubaintegralprecision,AccuracyGoal->$cubaintegralaccuracy};
$SSpecOptions={NNew->$NIncreaseS/10,Flatness->$FlatnessS};
$SOptions=Join[$CUBAOptions,$SSpecOptions];

Install["Suave"];

SetOptions[Suave,$SOptions];

MyFunctionS[m_]:=Suave[Integrand[r,Eu,s,t,m],{r,ereg,rmax},{Eu,1,EumaxE[muf[r],B[r],meff[r]]},{s,sminE[Eu,m,B[r],meff[r]],smaxE[Eu,m,B[r],meff[r]]},{t,tminE[s,m,meff[r],muf[r]],tmaxE}];

];
  • no luck. Then I tried to place another IF - with same condition, outside the if with the installs, and put the SetOptions commands there.
If[$useCUBA,
>     $CUBAOptions={PrecisionGoal->$cubaintegralprecision,...};
>     $SSpecOptions={NNew->$NIncreaseS/10,Flatness->$FlatnessS};
$SOptions=Join[$CUBAOptions,$SSpecOptions];
>     
>     Install["Suave"];
>     
>     ];
>     If[$useCUBA,
SetOptions[Suave,$SOptions];
MyFunctionS[m_]:=Suave[...];
];

It worked. Somehow the code after install was evaluated before finishing to execute the install command. This is something related to strange behaviour with mathematica since v12.2

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    $\begingroup$ I think this happens because Install affects the context and contextpath. When the parser reads the big If statement, it doesn't know that Suave is supposed to go in a different context, so it's put in a different context than you're expecting. You can also fix this by writing Suave in it's full context form (just evaluate Context[Suave] to find out it's context). $\endgroup$
    – Sjoerd Smit
    Commented May 21, 2021 at 15:26

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