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Questions tagged [table]

Questions on the use of the Table[] command and other functionality related to lists. Use [tag:matrix] for matrix algebra and related methods, and [tag:list-manipulation] for questions about transforming or operating on existing lists.

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42
votes
6answers
3k views

How to visualize/edit a big matrix as a table?

Is it possible to visualize/edit a big matrix as a table ? I often end up exporting/copying big tables to Excel for seeing them, but I would prefer to stay in Mathematica and have a similar view as in ...
14
votes
3answers
5k views

Table of Variables

I use a list of variables {x1, x2, x3} to Solve a particular set of equations. I am now trying to generalise this depending on ...
8
votes
3answers
8k views

Importing multiple files using a for-loop

once again I am stuck solving a seemingly easy problem :( I would like to make a List of tables by importing data from several txt-Files. Importing the data into a table works so far and I am able to ...
21
votes
5answers
2k views

Instruct a Table to only evaluate until a condition is fulfilled

I am looking for the way of building a Table of pairs of numbers in a fast way. My true table evaluates huge functions, and I see no way and reason to show those cumbersome expressions here. Let us ...
16
votes
6answers
1k views

Calling Table with custom iterator

I often find myself in situations where I, for example, need to build a table for some expression, but want to set the number of points rather then the step size, so the code ends up looking like this ...
13
votes
2answers
2k views

Is there a Break[] equivalent for short-circuiting in Table?

I am running Mathematica 7. The following is admittedly a silly example, but suppose that I have a list list whose entries are either ...
2
votes
3answers
3k views

How to create functions of arbitrary number of variables? [duplicate]

In the following code what would be the simplest way to generalize it to say some $N_f$ number of $z$ instead of just $z_1$ and $z_2$? ...
9
votes
3answers
837 views

How do I avoid scoping collisions of iterator variables?

Yesterday I had an issue that kept for quite a while. My code wasn't producing the right results. Now I know why and I am wondering how to avoid the issue in future. Consider the following code. <...
8
votes
3answers
5k views

How to make a table from two lists?

I have two lists. ...
4
votes
2answers
308 views

Mysterious behaviour of ParallelTable

This question is related to Export bug in combination with ParallelTable?. The following code shows an even stranger bug than in the upper question. The y-axis should always be logarithmic, but in ...
20
votes
3answers
2k views

WYSIWYG table creating and editing

In Microsoft Office OneNote 2010, creating and editing tables is easy. There are simple toolbar controls for creating tables: , and editing them once they exist: . My question is, what's an easy ...
19
votes
17answers
7k views

Generating a list of numbers that are not multiples of 4

I want to write simple code that will list all numbers from $1$ to $n$ that are not multiples of $4$. And in this case I consider that ...
13
votes
3answers
1k views

Fast way to export large amount of data in “Table” format

I have about a million 3D points, say data = Table[{1. x, 1. y, 0.}, {x, 1000}, {y, 10^3}]~Flatten~1; I want to visualize them, but ...
6
votes
2answers
1k views

Single Legend for a Table of Plots

For this toy problem ...
8
votes
1answer
300 views

Export bug in combination with ParallelTable?

I am programming with Mathematica 10.3.1.0 on Windows 10 Professional 64 Bit and have an i7-4940-MX 3,1 GHz processor (4 cores). When I use in the example code below ...
12
votes
5answers
557 views

TableAlignments -> Left not working

Bug introduced in 7.0 or earlier and persisting through 11.0.1 or later For a very simple dataset TableAlignments->Left does not work: ...
3
votes
2answers
444 views

Problem with NumberForm when exporting

I have a two-part question regarding NumberForm First question In my attempt at answering this i stumbled upon a strange behavior by NumberForm when the final result is exported. Lets say I have ...
2
votes
1answer
591 views

Nice presentation of correlation matrix

IO have those data as a text file ...
1
vote
1answer
3k views

Append[] is not working for empty list [duplicate]

I am trying to create an empty list and add an element but the list is not being populated. My code ...
1
vote
1answer
824 views

How to use Table to assign values to variables in a list?

I'm trying to do the following: R = {a, b, c, d, e, f, g, h, i}; Table[R[[n]] = RandomInteger[{0, 20}], {n, 1, Length[R]}] My intention is to assign a random ...
0
votes
2answers
2k views

Table of a two variable function

I would like to generate a table using a function of two variables. I tried the following: Table[{a, b, f[a, b]}, {a, 0, 5}, {b, 0, 5}] which does work as I ...
14
votes
7answers
787 views

How to properly inject iterators into table? [duplicate]

Goofing off on a prior question, I was fiddling with other methods, which led me to the need to inject a constructed set of iterators into a table construct. Now, ...
4
votes
2answers
636 views

Deleting vertices from a Graph and preserving structure

My goal is to remove vertices from graphs (and the edges from them) and then take GraphComplement to find out cut sets in graphs with sink and source such as here. ...
18
votes
1answer
596 views

Strange behavior of Table

Whenever I run the code a = 0; code := (a++); Table[code; a, {1000}] I get a list of 1000 zeros. However, if I replace 1000 with 100, then a get a list equal to ...
1
vote
4answers
401 views

How can I write the natural numbers less than $n$ that are coprime to $n$? [duplicate]

How can I write the natural numbers less than $n$ that are coprime to $n$?
23
votes
2answers
904 views

Unexpected behaviour from Table[]

The following code in Mathematica 11: iList = {i, -10, 10, 2}; Table[i, iList] produces this result: {i, i, i, i} Where in ...
6
votes
3answers
221 views

How to create a variable List

I need, given "n", create a list {a1,a2,...,an}. For example: Given n=3, the list that must be created is composed by the symbolic variables {a1,a2,a3}. Sorry if this question is simple. Does anybody ...
5
votes
6answers
1k views

How to generate a table with i != j

I want to generate a table with two indices (say, i and j) such that elements with i = j are omitted. How to achieve it ? Following is a simple example of what I want to do. ...
3
votes
2answers
119 views

Faster use of Condition for a large array (see the example)

Here is the example/problem. I have a array of $n$ random number. n = 2000; p = RandomReal[{0, 9}, n]; I have to create a $n\times n$ sparse matrix with $(i,j)$...
2
votes
1answer
330 views

Operations on dynamic arrays [duplicate]

When I do a simple operation like this fib = Table[Fibonacci[i], {i, 15}] and then look to find the position of a certain value, everything works fine: ...
1
vote
1answer
501 views

Function to marginalize a table over given parameters

Let us say I have generated a table tab with entries {p1,..,pd,chi2[p1,..,pd]} of dimension ...
1
vote
1answer
817 views

Can Table be used inside Manipulate?

EDIT: CHanged the code. Please try again t see if it works well on our PCs. I am creating a simple Manipulate[] notebook. However when I place Table[] in the code, like: ...
1
vote
1answer
242 views

direct assignment to the element in a Table

I have already asked a related question here why set values in this way doesn't work? But I think I have to write the question which I encountered explicitly? ...
0
votes
1answer
698 views

Table with the logarithmic step

Suppose some function y[x]. I need to calculate the table of the value of this function with the logarithmic step of the coordinate, i.e., the operation which corresponds to the Mathematica's command ...
2
votes
2answers
2k views

Get positions of all non zero matrix elements

I want to find all non zero elements of a table and I want to create a list that contains the name of the table the element was removed from, the position of the element, and the value of the element. ...
2
votes
2answers
1k views

Create a matrix of matrices using Band and ArrayFlatten [duplicate]

I can easily write a simple Band matrix using: SparseArray[{Band[{2, 1}] -> a}, {Dim, Dim}] where a is a number. Now, I ...
0
votes
1answer
62 views

Create bold headings and rows in `TableForm` if `x` is prime

In the following table ...
10
votes
5answers
1k views

Relational joining of tables

A common thing to want to do with data is to combine it (at least I thought this was a common thing). In SQL there is the idea of table joins "select id,v1,v2 from A,B where A.id=B.id" kind of thing. ...
5
votes
4answers
419 views

AccountingForm w/o significant figures

Basically I want to build a chart like something I would do in Excel. It should look like this: Here is the formula I'm using and what I've done so far ...
18
votes
6answers
6k views

Multiplying two dimensional data by a constant

I have a list of lists of the form: {{1, 2}, {2, 4}, {2, 8}} But I want to multiply only the second dimension of that data by a constant. I know I could do this ...
6
votes
2answers
592 views

Why doesn't ParallelTable work on this very simple example?

For some reason, I'd like to use ParallelTable with a variable number of iterators. Table[a[1], {a[1], 0, 10}] works fine: ...
4
votes
1answer
691 views

Errors when using ParallelTable inside a package

I'm developing a package that contains a function that requires evaluation of an expensive Table, so I use ParallelTable instead....
2
votes
2answers
514 views

How to sort Table/Matrix including legend(Labellings)

I want to sort table including its legend for graph I have table similar to M1 M2 M3 1 5 2 3 1 4 4 2 -10 5 7 11 6 -2 1 ...
29
votes
3answers
2k views

Generating 250 random points crashes the kernel, but not 249

Fixed in 10.1.0. Consider the following function, which generates uniformly random points on the surface of the 2-sphere: ...
8
votes
1answer
339 views

What is the most straightforward solution to save integers right aligned into a text file?

As an example I have a data list of dimension {10, 5}: ...
8
votes
4answers
333 views

Optimising Table wrapping over a Select

Suppose we have the following lists: ...
3
votes
2answers
361 views

Generating an editable table that can be used as input

Say I have a number $n_{max}$. I want a command to generate a table like 1 1 2 2 3 3 4 4 ... nmax nmax where the second column is editable, and this table can be ...
13
votes
2answers
378 views

Map vs. Table for index-specific operations on 2D arrays

Many experienced users on this site tend to use Map (and its variants, MapAt, MapIndexed, etc.) rather than Table. When applying the same operation to every element of an array, Map does seem more ...
13
votes
1answer
150 views

Can't make more than 249 Internal`Bags in a Table

I need a lot of Internal`Bags so I made them with Table. It works fine for 249 or fewer Bags...
9
votes
1answer
1k views

Smoothing out data points in a ListDensityPlot

I stumbled upon this problem when I was trying to make some nice smooth ListDensityPlots of my numerical data. In short, my problem is that I let Mathematica plot two copies of basically the exact ...