7.38 March 25, 2014
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Top new questions this week:
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[How to make a curve selectable from a scaned image and convert it to a
list of
coordinates]\url{http://mathematica.stackexchange.com/questions/44355/how-t
o-make-a-curve-selectable-from-a-scaned-image-and-convert-it-to-a-list-o
f-c}
I have a scanned image (binary-ized):
Is there any way to reduce one of these curved lines (full or dotted) to
a series of its coordinates (e.g., sampling interval of 0.01 on x-axis)?
I've read ...
- asked by Tough Kid (10 votes), answered by Alexei Boulbitch (11 votes)
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[Alternating
sum]\url{http://mathematica.stackexchange.com/questions/44564/alternating-s
um}
A frog is at the bottom of a 30 metre well. Each day it climbs 5 metres
up the side, but it then slips back 3 metres each night. How long does
it take to reach the top of the well?
Is there an easier ...
- asked by martin (7 votes), answered by Leonid Shifrin (5 votes)
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[How to extract the edge from a set of
points]\url{http://mathematica.stackexchange.com/questions/44694/how-to-ext
ract-the-edge-from-a-set-of-points}
I have an accumulation of points representing a body as you can see in
the image below. From this data I want to generate a list of points or a
curve, which is the envelope.
The first idea was a ...
- asked by zeckra (6 votes), answered by halirutan (4 votes)
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[Map of Specific US States?
(Isolated)]\url{http://mathematica.stackexchange.com/questions/44505/map-of
-specific-us-states-isolated}
My question here is fairly basic, and I'm sure I'm overlooking something
basic. I know about CountryData for creating shapes of entire countries,
and it works, to an extent; I can plot geographical ...
- asked by Smith W. (6 votes), answered by Pickett (5 votes)
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[Exporting EPS figures with dashing from
ListPlot]\url{http://mathematica.stackexchange.com/questions/44560/exportin
g-eps-figures-with-dashing-from-listplot}
I am having difficulties exporting EPS figures.
If I use the LineLegend option to create a dashed or a dot-dashed line,
it seems ok in Mathematica 9.0 e.g.:
But the problem came out when the ...
- asked by Qu8k (5 votes), answered by george2079 (6 votes)
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[How to import a large (~50Mb) json file in
mathematica]\url{http://mathematica.stackexchange.com/questions/44671/how-t
o-import-a-large-50mb-json-file-in-mathematica}
I am trying to import a 46Mb json file into mathematica (which by the
way I exported using mathematica) but its failing with the following
messages:
Java::pexcptn: A Java exception occurred after the ...
- asked by Trollkemada (5 votes), answered by Sjoerd C. de Vries (4
votes)
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[How to select only NotebookObjects that are referring to ordinary
notebooks? (not palettes
etc.)]\url{http://mathematica.stackexchange.com/questions/44588/how-to-sele
ct-only-notebookobjects-that-are-referring-to-ordinary-notebooks-no}
There is of course function
Notebooks[]
But, unfortunatelly it hasn't got useful options in this context.
My question is how to pick Notebooks excluding:
Help,
Palettes,
Packages,
...
- asked by Kuba (5 votes), answered by Kuba (3 votes)
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Greatest hits from previous weeks:
==================================
[What is the best Mathematica tutorial for young
people?]\url{http://mathematica.stackexchange.com/questions/733/what-is-the
-best-mathematica-tutorial-for-young-people}
As Conrad Wolfram said at the TED conference, in the future kids should
focus more on new technology. Computers compute better than humans, so
we should focus more on thinking and getting the ...
- asked by noisy (31 votes), answered by Vitaliy Kaurov (17 votes)
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[Problem with
NonlinearModelFit]\url{http://mathematica.stackexchange.com/questions/2309/
problem-with-nonlinearmodelfit}
I'm having trouble with a non-linear fit:
fit = NonlinearModelFit[data,
y0 + A Sin[\[Pi] (x - xc)/w], {y0, xc, A, w}, x]
where data has about 15 thousand points and looks like this:
The data ...
- asked by becko (14 votes), answered by Oleksandr R. (23 votes)
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Can you answer these?
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[Maintaining postfix convention for directives in
notebooks]\url{http://mathematica.stackexchange.com/questions/44606/maintai
ning-postfix-convention-for-directives-in-notebooks}
It seems to be a fairly common convention to write certain 'meta'
functions in postfix form like
f[x] // Simplify
to keep the the mathematical content at the front separate from the
various ...
- asked by Daniel Mahler (2 votes)
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[Function behavior based on
Head]\url{http://mathematica.stackexchange.com/questions/44425/function-beh
avior-based-on-head}
I'm figuring how to implement a function behavior based on the Head of
its argument.
I mean
Unprotect@Head;
Head[p_[x]]:= Kind;
Protect@Head;
function[h_]:= 0;
function[p_Kind]:= 1;
Head[f[x]]
...
- asked by Fabio (1 vote)
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[Controlling output of graphics, the role of ";" and code
structure/formatting]\url{http://mathematica.stackexchange.com/questions/44
630/controlling-output-of-graphics-the-role-of-and-code-structure-format
ting}
";" is described under Compound Expression as a delimiter, such that
only the output of the last item in the compund expression is given.
Situation:
1/ Print[] produces output whether followed by ...
- asked by Julian Moore (1 vote)