================================== Top new questions this week: ==================================
[String operation 1000X slower for special characters] https://mathematica.stackexchange.com/questions/152293/string-operation-1000x-slower-for-special-characters
It seems that the string operation is very slow if we have special characters in the string. Consider this example,
str = StringJoin@ RandomChoice[Join[Alphabet[], ToString /@ Range[0, 9]], ...
- asked by xslittlegrass (12 votes), answered by Alexey Popkov (12 votes)
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[Making a website with Mathematica] https://mathematica.stackexchange.com/questions/152663/making-a-website-with-mathematica
I know many people here have various websites associated with them and I’m guessing do at least some of the development of that stuff in Mathematica.
I recently fell down that rabbit hole myself, ...
- asked by b3m2a1 (11 votes), answered by C. E. (9 votes)
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[Convert association with list key to nested assocations] https://mathematica.stackexchange.com/questions/152676/convert-association-with-list-key-to-nested-assocations
I have an association that maps x, y pairs to values, for example:
<|{0, 0} -> "a", {-1, -4} -> "b", {-1, 1} -> "c", {-1, 0} -> "d", {1, 0} -> "e"|>
I want to convert this ...
- asked by 2012rcampion (9 votes), answered by MarcoB (8 votes)
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[Matching (y/x)^u terms wherever the appear in an expression]
https://mathematica.stackexchange.com/questions/152559/matching-y-xu-terms-wherever-the-appear-in-an-expression
Mathematica keeps rewriting expressions, so it is hard to figure what pattern to use.
I am trying to replace all occurrences of \(\frac {y}{x}\) by \(t\), but Mathematica re-writes ...
- asked by Nasser (9 votes), answered by aardvark2012 (4 votes)
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[Bulletproofing packages against SetOptions of built-ins] https://mathematica.stackexchange.com/questions/152472/bulletproofing-packages-against-setoptions-of-built-ins
Packages are (obviously) written in terms of built-in Mathematica functions. But many (if not, most) of these functions have options, like Expand, Solve, Compile
While a package is active, the user ...
- asked by QuantumDot (9 votes), answered by Leonid Shifrin (12 votes)
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[How can I offset a curve from the given data points?] https://mathematica.stackexchange.com/questions/152298/how-can-i-offset-a-curve-from-the-given-data-points
I am new to Mathematica programming.
I have a question related to my work with this software.
I have the data points below:
{{128.011, 86.7748}, {128.011, 86.7748}, {128.167, 86.7663}, {128.19, ...
- asked by Mukidi Lee (8 votes), answered by J. M. (12 votes)
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[Export[..., "tsv"] drops minus signs from Dataset [horrific bug?]] https://mathematica.stackexchange.com/questions/152355/export-tsv-drops-minus-signs-from-dataset-horrific-bug
Toy example:
First, create a Dataset:
data = Dataset[{<|"x" -> 1, "y" -> -2|>, <|"x" -> -3, "y" -> 4|>}]
Next, export it as a TSV file:
...
- asked by kjo (8 votes), answered by Rolf Mertig (6 votes)
================================== Greatest hits from previous weeks: ==================================
[Entering numbers in Scientific Notation?] https://mathematica.stackexchange.com/questions/36792/entering-numbers-in-scientific-notation
I need to play with a lot of powers such as 10^-3. 1E-3 does not work for it. Is there any
short form for it?
- asked by hhh (32 votes), answered by Rahul (43 votes)
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[Creating legends for plots with multiple lines?] https://mathematica.stackexchange.com/questions/4025/creating-legends-for-plots-with-multiple-lines
So I have a graph with multiple lists, for e.g.
data = {{1,2}, {3,4}, {3,5}, {2,3} . . .} If I then do ListLinePlot[Table[{#1,Log[b,#2]}&@@@data, {b,1,10,2}]] I have no way to generate a legend ...
- asked by Eiyrioü von Kauyf (60 votes), answered by Jens (90 votes)
================================== Can you answer these? ==================================
[Obstacle problem for the heat equation] https://mathematica.stackexchange.com/questions/152491/obstacle-problem-for-the-heat-equation
Consider the problem
$$\begin{cases} \max\{\Delta u -\partial_t u, \varphi - u \} = 0 & \text{ in } (0,T)\times \mathbb{R}^n \\ u(0,\cdot) = \varphi(0,\cdot) & \text{ in } \mathbb{R}^n. ...
- asked by Hiro (3 votes)
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[DateListPlot of multiple time series with data values and legend appearing as the cursor moves over ploted lines] https://mathematica.stackexchange.com/questions/152405/datelistplot-of-multiple-time-series-with-data-values-and-legend-appearing-as-th
This is very similar to my previous question. I want to use "DateListPlot" to visualize multiple time series (n) and see data values and legend as I move the cursor over plotted lines. To begin with, ...
- asked by ramesh (2 votes)
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[Using FindMinimum for a table of functions] https://mathematica.stackexchange.com/questions/152595/using-findminimum-for-a-table-of-functions
I am relatively new to Mathematica and am having trouble with my code running quite
slowly. What I am attempting to do is find the minimum value of a function (a chi^2) of one
fit variable, but this ...
- asked by nsbd88 (1 vote)