Confirming that it was a locale problem. A workaround for OSX is to have
the user create an English language account.
>
>
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I have a student who installed (the standard download) NetLogo 6.0.2 on a
MacBook Pro and finds that `extensions` is not recognized. I confirmed
this. Is this a known issue, and is there a workaround?
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How would I diagnose why an instance of NetLogo started with Mathematica
Link cannot find extensions that ship with NetLogo?
Thanks,
Alan
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Buttons currently include an option to disable the button until ticks
start. It would be nice if this were generalized to accept a boolean
reporter. (E.g., Disable unless `stageOneComplete`.)
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1. Stopping `loop` appears to terminate command line processing. E.g.,
`let _ct 0 loop [if (_ct = 10) [stop] set _ct (1 + _ct)] print _ct`
will not print anything`. Is this expected/desired?
(I.e., must the command be thought of as an "enclosing procedure"?)
2. Feature request:
would it be
The need to convert old models is becoming more common. This semester I
wanted students to look at a few models that were created in version 4. I
am starting to wish for a conversion tool ...
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After the bugfix, do `.nls` files now reload as well? (Or was it
intentional that they do not?) Thanks.
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Part way into a new semester, I find myself unhappy with a NetLogo
terminological decision.
I am going to urge the return to the `task` terminology.
1. lambda means nothing to my undergrad students, while task is very
intuitive
2. it is odd to use `is-anonymous-command?` and
I hope this question is at least minimally appropriate for this forum:
http://stackoverflow.com/questions/41334468/does-netlogos-ask-with-ensure-lazy-evaluation
Thanks,
Alan Isaac
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Is it intentional that newlines cause line breaks in the Info tab
rendering? Classic Markdown was designed to allow appealing plain text
*and* appealing rendered text, and this is lost when eols in the plain text
cause line breaks in the rendered text. In classic Markdown, one added two
In the Random Network Example, it is easy for the naive user to set
`num-links` too high, producing an infinite loop in `setup-simple-random`.
Two possible solutions:
i. set the `Maximum` to `num-nodes * (num-nodes - 1) / 2` in the
`num-links` slider.
ii. add the following (or equivalent)
Is `sublist` suprisingly slow?
Related: might NetLogo consider adding a fast `partition` primitive,
providing the basic functionality of Mathematica's `Partition`? (I.e.,
given #lst and #n, return a list of sublists of length #n.) It would
alternatively be find to behave more like haskell's
I am puzzled by the introduction of the `__set-line-thickness` command.
Naturally, there will immediately be a request for a __get-line-thickness
command. Why is the better approach not to have a line-thickness attribute
of turtles, which is set in the usual way? If the goal is to avoid
Today I was puzzled why my students did not find `max` and `min`. They
were looking at the list primitives in the dictionary, but `max` and `min`
are only in the math primitives. If they can only be in one of the two
places, I think it should be the list primitives.
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Currently a common beginner experience with `histogram` is that they see
nothing (because the data is outside the default x range). It would be
useful to have a `histogram-all` command that does a `set-plot-x-range` to
the range in the data before histogramming it. Doing something clever with
One thing I really miss from other high-level languages is multiple
assignment.
It seems like allowing
set [var01 var02] mylist
(when the two list are equal length) would not create any syntactical
ambiguity.
Is there any interest in this?
Thanks,
Alan Isaac
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I have some doubts about the wisdom of reset-ticks calling update-plots,
but perhaps I am overlooking something obvious.
Suppose `x` is changed each tick, and I want students to plot `x / ticks`.
This should be trivially simple, since it may come early in the semester.
(Assume ifelse-value
What is the current status of Mathematica Link for NetLogo 5.3?
Thanks.
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of the issue is the reason for proposing a new primitive.
Is there any sympathy for this?
Alan Isaac
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I will proceed by (i) showing there is demand, and then by (ii) giving an
example use.
(i) gnuplot offers both steps and fsteps options;
Mathematica offers InterpolationOrder-0 to achieve the equivalent of the
steps option;
Matlab offer stairs plots; and Matplotlib offers the `step` plot
offer incoming students?
For the moment I have instructed the student to create another account in
English and retry the install.
Thanks,
Alan Isaac
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OK: you changed the documentation to say enclosing rather than current,
so it is now clear that the present behavior is the intended behavior. I
think it would be clearer still to say something explicit about needing a
`stop` in the code block for `loop` if you want loop to ever stop
Yes, the example is constructed to reveal that behavior. But how am I
supposed to read the following documentation?
Runs the list of commands forever, or until the current procedure exits
through use of the stop
http://ccl.northwestern.edu/netlogo/docs/dictionary.html#stop command or
the
have never had the impression
that this raises the bar.
fwiw,
Alan Isaac
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My impression is that my undergraduate students are always connected -- at
least those living on campus -- but I have not surveyed them. I have had
graduate students who could not afford internet access at home and so were
connected only on campus, but I do not know how common that is.
I am
unresolved.
So ... what is the sequence of instructions I should give so that leads
every student to know exactly where his/her files are being written to?
Thanks,
Alan Isaac
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On Tuesday, March 10, 2015 at 5:35:29 PM UTC-4, Alan Isaac wrote:
So ... what is the sequence of instructions I should give so that leads
every student to know exactly where his/her files are being written to?
I suppose an operating system dependent set of instructions to create a
`temp
On Tuesday, March 3, 2015 at 8:27:52 PM UTC-5, Ken Kahn wrote:
Could it be a Windows symlink? -
https://msdn.microsoft.com/en-us/library/windows/desktop/aa363878%28v=vs.85%29.aspx
it explicitly with
`set-current-directory`. (I did not want to discuss the `shell` extension.)
Thanks,
Alan Isaac
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On Windows, `file-open /temp/temp.txt' apparently treats the initial slash
as pointing to the User's home directory.
Is this intentional? If so, is it documented? Is this a common convention
in the Java world? Or did some VMS
convention sneak in here somehow?
Thanks,
Alan Isaac
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Wouldn't it be trivial to activate the Includes button in the presence of
`__includes []` instead of requiring `__includes [arbitrary string]`?
This change alone would be worth something.
Just asking ...
Thanks for taking this seriously.
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students we really
puzzled by the interface.
Thanks,
Alan Isaac
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I see the problem facing the convention is that a plural indicates a list.
But it seems even more of a problem to propose that the difference between
a string and a line is that a string can contain EOLs.
But this may just be bike-shedding. Thanks for seeking short names.
Alan
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Thanks for spending some effort thinking about this. The most common
problem where this flaw becomes annoying is the following. A model has
many global variables; too many to conveniently create interface globals
for all of them, and similarly too many too set all of them explicitly for
There is no good workaround. The developers have not suggested a
workaround. This is a widely recognized problem. I personally do not see
how it will be adequately addressed unless initialization of non-interface
globals is changed. I would love to hear how the developers are thinking
about
Yet again, I'm needing this, and I cannot be alone. Is there any interest
in introducing a `behaviorspace-experiment-name` variable to hold this
information?
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let test 0
foreach [0] [
set test 0 ;works fine
run set test 0 ;raises error
]
end
Is this behavior desirable (and if so, documented)?
Alan Isaac
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Just to clarify, my wish was not for someone to write a helper function
(which is not hard), it is for negative indexes to be supported by the core
language.
Seth's opposition makes it pretty clear that this will not happen. But I
want to point out that the reason offered for this opposition
I've created an XML file of experiments. For the person I'm working with,
it would be great if they could interface with this file via
BehaviorSpace. (I realize I could patch all the experiments into their
NetLogo file, but that is inconvenient and error prone.) I think this
enhancement
Above `null` was just a suggested name for a new type. In JavaScript
terms, perhaps `undefined` is better.
The BS issues is as you note very real. The workarounds I have come up
with are tiresome and fraught.
I do not see a way that this can be fully addressed without changing the
default
Not sure if this is a bug report, but I was expecting to find
`clear-globals` since it's already in the docs, but it's not there. Also,
not sure if this list is where you want such reports.
Related to this, might sliders be given default values? It would be nice
if `clear-globals` (or
That's correct: the value dialogue just reports/sets the current value,
which is saved with the model. There is no actual default value: that
would have to be added, which I would consider a feature. Currently, to
load a model with pre-specified default values, one must use `startup` to
set
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