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

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3
votes
2answers
115 views

Sublists of Random Permutations

What is an efficient way to create a list of (psudo)randomly chosen permutations? I'm trying to create a list like below: ...
1
vote
2answers
246 views

How to append to a list of lists elegantly [duplicate]

I have have list of lists and I would like to be able to append an element to the start of each list. I am sure there must be an elegant solution. EG: a and ...
1
vote
1answer
101 views

ListLinePlot of data imported from an Excel file [duplicate]

This is a continuation of another very similar question about how to plot structured data using ListLinePlot. Here is a sample data imported from an Excel file: ...
1
vote
3answers
128 views

Complement[] changes order of elements?

Consider this example: Complement[{a, y, c, d, e}, {a, c}, {d}] (*{e, y}*) However, I was expecting the result to be: ...
7
votes
3answers
299 views

Issue with very large lists in Mathematica

I have a need to work with very large arrays of data in Mathematica. The length of the list is not known upfront. The typical size is a few hundred thousands elements and could easily go beyond a ...
3
votes
1answer
124 views

How to efficiently select elements from a Hash?

How can I write an efficient version of the following selection statement: Keys[Select[hash, # < constant &]]; // AbsoluteTiming hash can be made from: ...
3
votes
2answers
114 views

Wrapping Interval Notation for Take

I'm trying to implement the solution to a math problem in Mathematica, but my code can't handle a particular boundary case. I think that I could implement a function that would do what I want it to, ...
0
votes
3answers
114 views

How to manipulate with external data?

I have a .txt file which contains a lot of triples (a, b, c) (one per row) which should be coefficients of my equation ax^2+bx+c=0. I want to include each triple in .nb file and solve each equation. ...
-2
votes
1answer
144 views

How can I produce a list of solutions for a function which is updated with updated variables using for loop?

I need to loop over a set of equations, solving for X and adding the new X value to the old X value at each step. The output I need is a list ...
10
votes
3answers
199 views

Pick with nested list

I have a list of pairs of values. Some of those pairs are invalid based on another list. I would like to select only the valid pairs. ...
7
votes
3answers
215 views

Mapping a function over the parts of a deeply nested Array

I have two tensors: tensorS = Array[Subscript[s, #1, #2, #3, #4] &, {2, 16, 16, 19}]; tensorR = Array[Subscript[r, #1, #2, #3] &, {2, 16, 19}]; ...
12
votes
5answers
736 views

Is there a way to riffle more than two lists?

I thought Riffle would generalize such that Riffle[{a,b,c},{1,2,3},{x,y,z}] would return ...
2
votes
2answers
120 views

How to make functions from datasets

I have a csv that encodes the results of plugging certain parameters (say, A and B) into certain functions (say, ...
2
votes
1answer
70 views

Manipulating lists with uneven amounts of entries

So I have a list like so list={{a},{b,c},{d,e,f},{g,h}} and the basic logic I want is to be able to manipulate each of the nested lists individually. So If I ...
7
votes
2answers
601 views

Finding the coefficient of a certain power in a generating function

I want to compute $(t^1+\dots +t^5)(t^2+\dots+ t^6)(t^3+\dots +t^9)$ and find the coefficient of $t^{15}$ for example. $t$ is an indeterminate Now in Maple this is simply as ...
0
votes
2answers
162 views

Indirect transformation based on a list of data points

I have a set of data which describes the Intensity function $Int(q)$ as a function of $q$. The data list provided below provides the shape of $Int(q)$ versus $q$.How can I use this information to ...
5
votes
1answer
170 views

How to efficiently select element in a list of lists?

How can I write an efficient version of the following statement? Cases[list, {_, feature_} /; feature < constant]; // AbsoluteTiming List is of the form, list ...
3
votes
3answers
198 views

Breaking up combined data into several smaller data sets

I have one combined data with first number as the x-value and the remaining as different y-axis values (y1,y2,y3...). How do I break this combined list, data= (x,y1,y2,y3...) into smaller lists, such ...
6
votes
2answers
247 views

Is there a bug in the Part function of Mathematica 10?

I am using Mathematica 10 now. I typed code below {{1, 2}, {2, 4}, {3, 6}, {4, 8}}[[;; , 1]][[1]] and this gives result 1 ...
2
votes
1answer
85 views

How to select elements with a specific style of a list?

Suppose I have a list: where 3 'up's of the list are red(I've made it to Cell Expression as follows). ...
3
votes
2answers
572 views

Why does a certain CSV file import properly into LibreOffice but not into Mathematica 10.0?

I'm working on a project involving data manipulation and it involves working with CSV files. I know that the files are properly formatted as when I import them into LibreOffice, all of the columns ...
8
votes
3answers
313 views

How to remove a line of a matrix if not all elements are numeric?

I have a matrix a n columns and m lines. I'd like to efficiently remove the lines that are not entirely composed of numeric ...
1
vote
1answer
76 views

Appending functions to a list [duplicate]

Could someone please explain the difference between these methods, and possibly a nicer way to get the first result? (This is a toy example and in my real program I'd like to use ...
2
votes
3answers
439 views

Alternatives to Append/AppendTo for generating a list in an interactive DynamicModule?

I have a stack of timelapse microscopy images that I am trying to segment frame-by-frame using some of Mathematica's image processing functions. I have created a little interactive DynamicModule with ...
7
votes
1answer
319 views

Tuples without self-loop

I have a simple question coincerning the Mathematica function Tuple. Currently, I apply the following code ...
16
votes
8answers
710 views

UnFlatten an array into a ragged matrix

Trying to unflatten an array that was part of ragged array of sub matrices. As input we have flattened array: ...
8
votes
5answers
229 views

How to do DateDifference on table items containing dates

I have a Table with data in form {{date}, value}: ...
6
votes
0answers
80 views

Listable compiled functions used in NMinimize [duplicate]

This is an example from MMA: cListable = Compile[{x}, (x-1)^2, RuntimeAttributes -> {Listable}] In case of single entry: ...
7
votes
5answers
528 views

Find patterns in a list

again, I have a list like this: ...
3
votes
1answer
91 views

Use Style on list elements

I have a list like this: list = {0, 0, 0, 1, 1, 1} I want to color all the 0's in red, but I dont want to count through all the elements, like in my solutions, ...
6
votes
2answers
153 views

Is there a built-in function to map a list of heads to a list of data?

Assume that this built-in function is called func. What I want is func[{f,g},{a,b,c}] will return the following result: ...
3
votes
1answer
96 views

Part specification error only in LogPlot

I've a problem. I defined a simple list and a function like below: lst := {5, 10, 20} f[m_] := lst[[Floor[m/10]]]; and drew a plot ...
6
votes
2answers
153 views

Return value of Reap when using tags

I've noticed a behaviour of Reap that I don't quite understand yet. Suppose I want to Sow several values during a computation. ...
18
votes
4answers
423 views

Make MapIndexed listable

My goal is to apply MapIndexed to every element of a nested list without destroying the arithmetic operations within the elements. For example, let's start with ...
1
vote
2answers
686 views

Computing 10-dimensional volume of a 9-sphere [closed]

I'm trying to compute 10-dimensional volume of a 9-sphere with radius r using Monte Carlo. ...
1
vote
1answer
159 views

Strange behavior of function (memory leaks)

I have some funtion: ...
30
votes
5answers
1k views

How to understand the usage of Inner and Outer figuratively?

Description: In Mathematica the functions like Thread, Inner, Outer etc. are very important ...
2
votes
2answers
169 views

How to get the current index during a Scan iteration?

Is there a special keyword to get the current index in Scan ? For example, let say I have the following code : ...
7
votes
2answers
362 views

Converting a string into a nested list of strings

The following string can be converted easily into a list with ToExpression ...
3
votes
2answers
117 views

How to modify the elements of a list in a loop?

I have a list with points coordinates. And I'm trying to traverse it and perform some matrix operations on each point. But I have a problem with storing modified points in the initial list instead of ...
2
votes
1answer
254 views

How to build a list of constraints for NMinimize

Let's say I have aset = {-1, 0, 2}. I would like to create a variable Var that takes values from that set, i.e. ...
7
votes
5answers
350 views

How to display operations on list elements

When applying some arithmetic operation on two lists, I'd like to display the actual operations between the elements of each list. For example, {1, 1} + {1, -1} ...
1
vote
3answers
161 views

How to ReplaceAll independent of depth?

I have a big list which in principle can be described as this more compact list : ...
0
votes
1answer
241 views

How to plot data points in the form X, Y, E(X, Y) where X and Y coordinates are not ordered?

I have got a file with field values (RF simulation of a resonator) which consists of 3 columns: X and Y cartesian coordinates ...
1
vote
1answer
812 views

Remove curly brackets _completely_ to map a function to the elements of a list [duplicate]

Most list manipulations can be done with Flatten, Partition and Take. I didn't managed to ...
2
votes
4answers
258 views

Import xls data with dates

I have an excel table that have 2 columns, the first one are dates, and the second one are values. I want to plot the value vs the date. I need to: first clean all the non numbers strings like ...
10
votes
1answer
617 views

How to split a Dataset into training and testing for machine learning?

Suppose I have iris data In the Dataset Format. How to split the iris data Into training and testing for Machine learning? For example,Transform the data for Classify.
6
votes
3answers
447 views

Rotate lines around their midpoint

I am trying to rotate a series of lines by the same angle around their centre point. Say each line is defined by a co-ordinate at each end, simplified example below of a typical dataset. ...
1
vote
1answer
102 views

How can I write a function which takes another function of a variable and the variable itself as arguments and gives a list of critical points?

This is an exercise from Power Programming with Mathematica by Wagner. I need a function which takes a function and a variable as arguments, like this: critpts[f_,x_]:= and then on the rhs I've got ...
3
votes
1answer
134 views

Read and write files

I have a text file, its content is(for example): ...