# Tagged Questions

Questions on the manipulation of List objects in Mathematica, and the functions used for these manipulations.

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### Given a list made up of subsets of an alphabet, how can I use associations to create a Boolean dictionary of the given list

I have a list of 30,000 elements, each of the element is a list in itself {{a, b}, {p, q, r}, {a, p}, ..., {z, x}}. Second one contains unique elements ...
323 views

### Input a square matrix and return a list of the matrix entries read by antidiagonals

I have a square matrix: {{1,2,3},{4,5,6},{7,8,9}} and I want to get a list: {1,2,4,3,5,7}
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### Cases Except - Selective Exclusion

Please help me use Cases,Except on list data. I just want to remove all primes, or equivocally to see only the values in the list produced that aren't prime. the prime factorization of those values ...
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### How get repeated elements from two lists

How to write a code that takes an certain element related to a given subset in a LIST 2, that occurs also in a LIST 1? for example, there are two lists: ...
59 views

### Compute the evolution of percentages from a data file

My data is stored in external .out files which contain six columns and a large number of rows. I know that I have to provide a small sample but the structure of my data is so unique, so I provide the ...
202 views

### Generate lists that satisfy a condition in an efficient way

The following code produces lists of sublists with maximum length 5 that shuffle zeros around an ordered list (here {1,2}). It produces all permutations while ...
244 views

### How to produce a table with column and row headers included?

I have searched and have not found a solution. n = Table[i^2 + j*3, {i, 3}, {j, 7}] // TableForm Export["stuck.xls", n] ...
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### How to split (large) arrays like this?

I want to split this table (list/array) ...
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### Extracting parts of a list subject to a condition

I've got a list like following: ...
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### Select equation in a list of conditions

I have an equation list {a'[t]==b[t],c'[t]==d[t],x'[t]==y[t]} and upon running FullSimplify[] it becomes ...
120 views

### convert list to equation form

Suppose I have a list condition={f'[t]-3,g'[t]-f[t]} and now I want to use DSolve on it so I need to convert the list to <...
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### How to use Manipulate to cycle through a list of lists over a function

So I can do something like this which I like: Manipulate[i, {i, {1,2,3,4}}] It lets me pick which specific values I want to allow to be chosen for my function. ...
324 views

### Lookup construction using data matrix and Reap/Sow versus AppendTo`s

I am a user of MMA9 and made my own kind of Lookup, which is now a standard command in Version 10. In my program there is a section in which by means of a StringReplace[ ]-command containing a lot of ...