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user 18811
Questions on filtering or selecting data based on certain criteria. This is to be used with primary tags such as list-manipulation, string-manipulation or signal-processing, with the primary tag indicating the specific use case.
-1
votes
3
answers
151
views
Create table of elements which belongs to specific sets
I would like to produce elements (preferably by Table or For-If commands) that they belong to specific sets. For example I want to write positive integers from 1 to 100 such that they are $2 \pmod 3$, …
- 848
2
votes
Create table of elements which belongs to specific sets
Using MemberQ I wrote the following code and it worked:
A1={2};
A2={3,5,6};
A3={7,8,10}
Union[Flatten[Table[If[(MemberQ[A1,Mod[i,3]]==True
||MemberQ[A2,Mod[i,7]]==True||MemberQ[A3,Mod[i,11]]==True),i …
- 848
2
votes
2
answers
78
views
Select subsets from a list based on a criterion?
Assume we have a set of numbers, for instance $A=\{2,3,4,5,6,7,8,9,10\}$ and we are looking for the sums of reciprocals such that they are less than one. I mean I am looking for all $S_B$'s
$$
S_B=\su …
- 848
0
votes
1
answer
91
views
Produce result faster than "Table[If[...]]"
I would like to generate a list of output satisfying some condition for instance an equation but faster than the following code:
t=4;p=20;
Union[Flatten[Table[If[t<=(4a b d-1)c/(a+b)<=t+1,{(4a b d-1) …
- 848