Linked Questions

602 votes
19 answers
156k views

Where can I find examples of good Mathematica programming practice?

I consider myself a pretty good Mathematica programmer, but I'm always looking out for ways to either improve my way of doing things in Mathematica, or to see if there's something nifty that I haven't ...
7 votes
5 answers
930 views

How to Apply Functions to Lists with Many Curly Brackets?

For example, consider the list defined below. samplelist = {{{1,2,3,4}}, {{5,6,7,8}}}; How would I apply the Times operator ...
64 votes
8 answers
106k views

Assign the results from a Solve to variable(s)

I understand Mathematica can't assign the results of a Solve to the unknowns because there may be more than 1 solution. How can I assign the 4 values of following result to variables? ...
1 vote
1 answer
68 views

How to use syntax instead of double for loop

I would like to find the distance between a point list (i.e dalist) and list of centers (i.e framecenters). I used the following ...
5 votes
1 answer
240 views

Why Cases and Select treat the List differently?

Look at these two examples: In[1]:=Select[f[i], MatchQ[_f]] Out[1]:=f[] In[2]:=Cases[f[i],_f] Out[2]:={} It seems that the Select take $f[i]$ as List, but Cases ...
1 vote
1 answer
58 views

Head of level : question about the Apply function

I am not sure to really understand how the function Apply works at level 2 for example. I have read this question and few others and it doesn't help me :Levels: how do they work? Take the following ...
13 votes
3 answers
3k views

how to efficiently apply function to all pairs of a set (and collect the results)

To build a graph, I need to apply a function f[a_, b_] to all pairs of a list (3500 elements). The function itself returns a link ...
3 votes
2 answers
151 views

What exactly do single brackets represent syntactically?

I'm trying to deepen my understanding of the mathematica language after having messed around with it for a long time. I'm reading the book "mathematica programming Intro". Unfortunately, I don't ...
8 votes
4 answers
676 views

Extract all Values from nested Association

Considering we have an Association: ...
4 votes
6 answers
1k views

Creating a third list from two given lists [duplicate]

I imported 2 lists of the form {{x1,y1}, {x2,y2}, ...} and {{x1,y'1}, {x2,y'2}, ...} into Mathematica. I want to make a ...
0 votes
0 answers
144 views

Indicate level with Replace [duplicate]

Replace[{{x^2, Sqrt[x]}, {x + 1, x - 3}}, f_[x__] -> f, 1] Level 1 of Replace works here as expected with output {List,List} ...
0 votes
0 answers
44 views

Understand the notion of level with apply [duplicate]

There is something I don't understand with the notion of levels with apply. I take this example : Apply[f, {{a, b, c}, {d, e}}, {2}] Mathematica answers me : <...
5 votes
1 answer
1k views

What do brackets around a levelspec option do?

The following code returns the first three integer elements of Sqrt[Range[100]]: ...
0 votes
0 answers
62 views

Where can I find mathematica documentation about @@@? [duplicate]

For example, to build a rule from 2 lists {a,b,c}, {1,2,3}, I use: ...
2 votes
1 answer
82 views

Higher functional programming partial substitution

This h[g_, x_] := g[x] h[Sqrt, x^2] works obviously as well as : f[x_]:= x^2 h[f,x] but if ...

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