Linked Questions
40 questions linked to/from Scan vs. Map vs. Apply
13
votes
1
answer
2k
views
When to use @@@ vs. /@ [duplicate]
So much thanks to Szabolcs in improving sequence.. for complete explanation. I am so glad to read all explanation which fundamentally remove the problem. But in number 4 of its explanation pointed to <...
- 4,787
1
vote
1
answer
395
views
Misunderstanding the difference between Map Apply (@@@) and Map (/@) [duplicate]
Here's a minimal working example of a problem I'm having:
...
- 1,003
1
vote
1
answer
118
views
I keep writing functions like this one: subtract[{a_, b_}] := Subtract[a, b] [duplicate]
(Edited to provide an example)
Recently I have found myself writing silly functions like the following, which is just a new arity of Subtract in which the arguments are inside a list.
...
- 1,240
0
votes
1
answer
57
views
Struggling to Apply "Differences" [duplicate]
It looks like the following code should work, and allow it spits out error messages saying I have too many arguments, the code spit out after the error message looks like exactly what I want to ...
0
votes
1
answer
77
views
Problem with Apply [duplicate]
I have am trying to obtain the average of the distance from the mean radius for each shot in a group of shots at a target. I am having problems with the very last line. The output of the last line ...
- 177
1
vote
0
answers
59
views
Simple question about compared Map (/@) against Apply first level (@@@) [duplicate]
Does the function Map (/@) is equivalent to Apply to first level (@@@) ?
he way that I see this head functions are that both are equivalent. Please, comment if they have a fundamental difference.
- 1,418
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 :
<...
- 2,144
597
votes
19
answers
154k
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 ...
203
votes
3
answers
53k
views
Alternatives to procedural loops and iterating over lists in Mathematica
While there are some cases where a For loop might be reasonable, it's a general mantra – one I subscribe to myself – that "if you are using a ...
- 270k
75
votes
7
answers
5k
views
Functions vs. patterns
Every time I define a new function, I wonder which construct I should use: true functions obtained by using Function, or rule-based syntax. For example, these are ...
- 14.9k
63
votes
8
answers
105k
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?
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- 6,836
53
votes
2
answers
2k
views
Head and everything except Head?
I have been working on picking expressions apart using Head and Part and encountered a little mystery. Consider the canonical ...
- 8,651
18
votes
5
answers
2k
views
Iterate until condition is met
I want to find the first 5 prime numbers of the form $n^6 + 1091$. I have used this code:
Timing[Select[Table[n^6 + 1091, {n, 10000}], PrimeQ, 5]]
Which gives ...
- 883
23
votes
3
answers
2k
views
When must I use the Return function?
In a comment to my answer to this question, QuantumDot asks, "Where can I find more information on when I must use the 'Return' function?". I found this too deep a question to be answered by leaving a ...
- 107k
29
votes
1
answer
3k
views
Two ways to map a function on a list: Which one is faster?
There are two ways to make a function listable on the list: Use Map or use SetAttributes. My question is, which one is faster, ...
- 1,751