The efficiency tag has no wiki summary.
1
vote
0answers
66 views
Improving the plotting time of a very complicated expression
The quatity $R$ is defined by a complicated expression in terms of $a_1,a_2,\ldots,a_n$. Now each $a_i$ is a function of $x$, $a_i(x)$. I would like to know what is the most efficient way to ...
7
votes
2answers
101 views
0
votes
0answers
46 views
Does setting FindMinimum constraints improve efficiency? [closed]
I am a newbie and this my first post.
I am using the FindMinimum function to minimize a function of between $19$ and $35$ variables and I do this about $200$ times ...
7
votes
1answer
53 views
Creating a NearestFunction that returns an index
I use Nearest repeatedly for large data sets. For example
pts = RandomReal[{-1, 1}, {1000, 3}];
Nearest[pts, {0, 0, 0}]
I ...
13
votes
3answers
181 views
Common subexpression from two expressions
I am working with some unpleasantly tedious polynomials, which need to be manipulated in various ways (integrate with respect to some variable, differentiate with respect to another). Since these ...
2
votes
2answers
87 views
Mass Symbolic Manipulation with Subscripts? (from plaintext Input)
The simplest example of the change being sought is a greek letter, typed in as plaintext nu, and its may be replaced by the symbol, ν:
expr = 3nu*kx*ky+ ...
0
votes
2answers
111 views
Import large amount of data with time stamps
I have a large data file (150 000 lines) which I want to import in Mathematica. The first few lines look like this
...
1
vote
0answers
54 views
Significant platform-dependent efficiency when importing data?
I'm curious, as I understand that answer this way:
If you are using a Linux derivative or something like cygwin on
Windows, then this is an efficient solution for reading only the third
field ...
4
votes
2answers
77 views
Efficient drawing of convex polyhedron given a set of points [duplicate]
I have a set of points in the 3D space and I want to draw the bounding convex polyhedron of those points. A very naïve solution would be to draw a triangle between every three points:
...
2
votes
2answers
104 views
Importing several huge files with headers & footers
having here several files in ASCII format
http://ge.tt/91rv0Jf/v/0
I want to import, while removing headers and footers and then join the several lists.
...
4
votes
1answer
73 views
How to read off coefficients of tensor-like expression in a speedy way?
I am considering identities involving t[a, b, c, d, ...], where number of indices is fixed. t has the cyclic property so that ...
4
votes
1answer
87 views
Why is Flattening a CoefficientArray so slow?
I have a vector of $n$ degree $n$ polynomials in $(x,y,z)$, each of whose coefficients is an inhomogenous linear expression in $3 n^2$ variables. I want to write down the linear equations in these $3 ...
1
vote
1answer
60 views
Only perform a symbolic differentiation once
I want to define a function that involves a differentiation step that Mathematica can do easily, which might be of the form
...
4
votes
1answer
139 views
A Faster way to combine two Lists of different structures into one of a different structure [duplicate]
I have the following two lists (each containing over 500,000 elements). Here is a sample:
...
7
votes
3answers
308 views
Efficient code for the Ten True Sentences puzzle
I am trying to solve Ten True Sentences Puzzle.
Take a look at the following sentences:
The number of times the digit 0 appears in this puzzle is _.
The number of times the digit 1 ...
11
votes
4answers
414 views
Can you recommend an efficient method for finding the least integer satisfying my inequality?
I tried find the minimum make
$\frac{1}{2}+\frac{1}{2+\sqrt{2}}+\frac{1}{3
+\sqrt{3}}+...+\frac{1}{n+\sqrt{n}}>15$
Following code is so slow when I use condition
...
4
votes
3answers
326 views
How to make brute force coding more efficient?
Hi guys and guysettes,
The little Mathematica I've been using/seen so far, it seems to be all about neat "one-liners" using the underlying functions and working with lists & maps to solve issues, ...
12
votes
2answers
365 views
Difference between AbsoluteTiming and Timing
I need to evaluate the efficiency of my code. Therefore I would like to evaluate the time the code need for some calculations. Mathematica gives me two possibilities for this kind of evaluation:
...
