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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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### 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 ...
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: ...
892 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 ...
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 ...
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 ...
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 ...
2k views

### Display 10^n as power

How can I tell MMA to display input of the form 10^n as $10^n$ and not e.g. as 1000 for $n = 3$ or the rational $\frac{1}{1000}$ for $n = -3$. This would help to ...
1k views

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### 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 ...
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 ...
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 ...
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, ...
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 ...
376 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 ...
386 views

### How to build a list of elements satisfying a certain property without building a list of all elements first?

Is there a way to directly build a list of elements that satisfy a certain property? More precisely, I am looking for a function IncludeIf (this is a placeholder ...
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 ...
150 views

### Can't make more than 249 InternalBags in a Table

I need a lot of InternalBags so I made them with Table. It works fine for 249 or fewer Bags...
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 ...
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: ...
7k views

### Is there a Mathematica equivalent to MATLAB's logspace? [duplicate]

Possible Duplicate: How can I get exactly 5 logarithmic divisions of an interval? I want to use Table to generate a list of items, but want the indices to be ...
450 views

### Display a list or array as a centred triangle

How can I get Mma to display an array like {{2, 1, 0, 0}, {1, 0, 0}, {0, 0}, {0}} as an upside down triangle where the first row is the base and the last row is the tip, with each row centred ...
852 views

### Best way to handle nested Maps?

I often find myself working with lists of lists of data, gathering data, performing computations, and producing a variety of different sorts of output. Intuitively, it seems like this should be done ...
188 views

### What is the best way to use errors in mathematica M12?

Since ErrorListPlot has been superseded by new functionality in ListPlot for Mathematica 12.0, what is the best way to handle ...
182 views

### Specialized form of Outer[f, list, list] for symmetric f

Consider a function f that is symmetric with regard to its two arguments i.e. f[x,y] == f[y,x]. Using ...
207 views

### How to correctly implement in a new function the scoping behavior of Table, Sum and other commands that use Block to localize iterators?

It is documented that "Block is automatically used to localize values of iterators in iteration constructs such as Do, Sum, and Table." Therefore the dummy index (iterator) in a Sum is shielded ...
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. ...
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. <...
317 views

### Correct way to generate large data sets (i.e.forward yield curve )

I would like to generate a set of forward yield curve matrix of size 1000 x 100. First I defined my SparseArray of 1000 x100: ...
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 ...
236 views

Background & Question So if you're reading this you probably think Mathematica is pretty great - at least I do. The function Table by itself take someone ...
114 views

### How to implement a resumable Table?

Motivation (my sob stories) Too many times I've run a notebook for hours and then Mathematica crashes (FE or Kernel, mostly FE) and things are lost. I've made various attempts at custom solutions ...
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 ...
4k views

### How can I format a table to look nice?

I have this code, but I would like to see the results well formatted. How can I obtain a well formatted data with alignment similar to this one? Instead, I obtain the result you see here (click to ...
1k views

### Why does a table with a defined constant in its index compute 10X slower?

I need to do some iterative summations. Here is a minimum working example: ...
5k views

### How to make a table from two lists?

I have two lists. ...
768 views

### How best to join tables, which have different lengths on the same column values which exist in both tables?

I think my problem is pretty simple, and in SQL this would be trivial. I have two tables ...
333 views

### Optimising Table wrapping over a Select

Suppose we have the following lists: ...
1k views

### Why is building a table of function values so much slower than just plotting the function?

Here is a function that take some time to evaluate: n = 1000; coeffs = RandomVariate[NormalDistribution[], n]; f[x_] := Sum[coeffs[[k]] Sin[k x]/k, {k, 1, n}]; ...
338 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}: ...
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 ...
2k views

### Suppress warnings in ParallelTable

I'm using ParallelTable to evaluate a function that involves NIntegrate. There are a lot of ...
1k views

### Merging two Lists

I have two tables. One is given by T1 = Table[{x, y, 0.}, {x, 0, V},{y, 0, V}] and from a calculation I have the second, a list of points {x, y, z} ...
369 views

### Formatting a table to look nice

my current code is: ...
415 views

### Can Mathematica Take Advantage Of a AMD Ryzen Threadripper 2990wx 32 Core Processor?

I have a student version of Mathematica. I'm currently running it on my 8 Core Desktop. On my current Desktop I use it for Numerically integrating expressions 1000s of times, the ParallelTable ...
224 views

### Grouping the list of numbers that have common.

I am working on some simple problem. It is like puzzle.. Let's say I have some list input={{1,1},{1,2},{1,3},{2,3},{3,3},{4,4}} Which means 1 can go and back to ...
201 views

### Why does Table behave differently in Mathematica compared to WolframCloud?

In Stephen Wolfram's elementary introduction to the wolfram language it says you can use the table function like this: Table[5, 10], to create a table of the ...
275 views

### How to make a table with a jump in range?

I'd like to use Table to generate a list of numbers that includes a gap. For instance, this accomplishes what I want: ...
127 views

### Combine Table with Riffle

I have table of function f[x,a]. For the sake of easy reproduction, let's limit it to a few entries - the original is over ...
### How to make a table of $\sum_{i=1}^n$?
I want to create a table of $\displaystyle \sum_{i=1}^n i^k$ for $1\le k\le 5$. The output I want to obtain is a TeXForm output as follows. \begin{align} \sum_{i=...