Wolfram Mathematica

9:26 AM

There is no direct way to access the parent context, is there?

P. Fonseca

9:58 AM

@SjoerdC.deVries and yet, their highest standard still doesn't go to 64 kernels... (this is so last decade...).

Phab

10:50 AM

Hi there,
Some time ago I found a Question/Answer, about how people name their variables with not using Subscript, but I can't find this thread.
Maybe someone here knows which thread I mean?

C. E.

11:15 AM

@Kiro Much simpler than Minecraft, but still: Tic-Tac-Toe, 2048, Game of Hex

@Szabolcs What is the parent context?

@Phab mathematica.stackexchange.com/a/6514/5478 ?

11:59 AM

Suppose that $Context is Foo`Bar` . I can refer to Foo`Bar`Baz`x using simply   `Baz`x , without spelling everything out.  I was wondering if there is a similar simple way to refer to Foo`  or to Foo`y in the same situation.  There probably isn't.

@Kuba ^

@Szabolcs I see, I am not aware of any way either. It doesn't seem that Foo` and Foo`Bar` are related in any special way in, from language perspective. I mean there is no context child concept etc.

@Szabolcs but thanks for asking that, it helped me to realize something about something else ;)

Phab

12:41 PM

@Kuba I was thinking of a convention naming a lot of variables:
In Matlab you could name them g1_volume, g2_volume etc. in Mma it wont work.

But I found the solution I saw some time a go. The user just named his variables with $ as delimiter:
g1$volume, g2$volume, ...

Kiro

1:15 PM

@C.E. Thanks!

@Kuba I'm just going to ping you here as comments can't ping two people. Comment

@Szabolcs roger that

BTW Compress also doesn't preserve the context information:

I always wondered if Compress just compresses a MathLink stream. But maybe it's a bit different.

So many people went missing recently, anyone seen Olaksandr?

Q: how to input gray background and hyperlink?

@Szabolcs It is (almost?) always the case that "what you see is what you save" which was surprising for me when I was told I have to Block a $ContextPath to Save a symbol from loaded package.

1 hour later…

Meta

2:36 PM

I saw that people can input code with gray background and include hyperlinks in their answers and comment, for example, the answers from the following link give a good example How to remove redundant {} from a nested list of lists? where can I learn how to do that?

2 hours later…

4:41 PM

@halirutan I think you asked something similar once, not sure ... any comments? community.wolfram.com/groups/-/m/t/971065

Searke

4:57 PM

@Szabolcs Paclet stuff is really not well understood even by most people internally. I had to learn how to use the Paclet` context from examples given to me.

5:12 PM

Is it expected that changing a pure function with unnamed input to a pure function with named input can change the output?

{1, 2} // (# /. {_, a_} :> a) -> #[[1]] &

{1, 2} // (input \[Function] (input /. {_, a_} :> a) -> input[[1]])

5:35 PM

@MichaelHale Stupid broken annoying scoping via renaming, fix it with SetSystemOptions["StrictLexicalScoping" -> True].

both Function and RuleDelayed are scoping constructs

@Szabolcs Ah. I remember seeing discussions about that option, but I figured I'd read about it more when I ran into an issue. I guess that will be this evening. Thanks.

Although it works if I replace Rule to List. I can keep the Function and RuleDelayed.

{1, 2} // (input \[Function] {input /. {_, a_} :> a, input[[1]]})

Jose E Calderon

6:38 PM

Hello

1 hour later…

8:00 PM

@Szabolcs Is this the same issue?

"abc" /. a_String :> "'" <> a <> "'"

<|1 -> "abc"|> /. a_String :> "'" <> a <> "'"

8:36 PM

@MichaelHale Not sure if I got your point but the second example seems to be related to Association's attributes.

HoldAllComplete in particular.

8:49 PM

@Kuba Just checking to see if that behavior is expected or a bug. Wasn't expected for me. I thought I had heard they had enabled replacements to work on associations.

I just rewrote it with a Map for now.

@MichaelHale mathematica.stackexchange.com/q/124603/5478