This Tag is used for two things: Questions regarding improving execution speed and questions where various methods are compared for execution speed.

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11
votes
3answers
321 views

Intermediate display similar to PrintTemporary

Using MMA we often come across situations like the following cityLIST = CityData[#, "Name"] & /@ CityData[]; This code if you evaluate will emit some display ...
17
votes
3answers
332 views

sudden increase in timing when summing over 250 entries

I see a sudden increase of Timing by a factor of thousands when I sum over 250 elements of a matrix rather than over 249. So for instance, this table contains sums ...
20
votes
2answers
300 views

Incorrect Timing of Total

For demonstrating how fast C-compiled functions can be, in one of my courses I use the following function for finding the sum of a list of reals: ...
3
votes
2answers
134 views

Reflecting lines in ellipses: speed up the code?

I have the following code which calculates a list of points that a line would take after bouncing off various ellipses. ...
2
votes
1answer
120 views

Graphing the amount of time a function takes

I know I can find out the amount of time a function takes to run like this: In:= function1[100] //Timing Out:= {0.043334, Null} How can I graph this over a set ...
11
votes
2answers
662 views

Why is ParallelMap way slower than Map

I recently tried to use ParallelMap instead of Map and to my surprise encountered that ...
7
votes
4answers
229 views

Getting AbsoluteTiming to display in hours, minutes, and seconds

I'm doing some extended length calculations and was wondering how I could get AbsoluteTiming to display in hours, minutes, and seconds. I googled and found nothing, ...
6
votes
1answer
740 views

Simple countdown timer in Mathematica

I dug around a bit and did not find a simple and clear implementation of countdown stopwatch in Mathematica. I am looking for a function that takes as an input a certain integer and then counts down ...
2
votes
0answers
62 views

Why is this function taking so much more time when its argument reaches 250? [duplicate]

I am observing something which I do not understand with the following function function: ...
5
votes
1answer
149 views

Systematic increase in runtime [duplicate]

When I run this simple code, which repeats many times the exact same operation (a differential equation), the runtime (given by Timing) increases systematically, ...
2
votes
2answers
282 views

Good coding for a sequence of derivatives

People on this site keep telling me that good MMa practice avoids the use of loops. The code below calculates the same Table of derivatives two different ways, ...