Tagged Questions

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.

151 views

How to create and format a table via menu [closed]

I created a 3x3 table via menu Insert > Table/Matrix > New..., but afterwards I cannot add a new line or column. The tool doesn't add a row of 3 columns, but a row of one column at the end; when ...
252 views

How to imitate list comprehensions for constant arrays?

In Python, ['a'] * 10 generates ['a', 'a', 'a', 'a', 'a', 'a', 'a', 'a', 'a', 'a'] and ...
62 views

Error Resulting from Placing a Dynamic Variable inside of Table

I want to create a list of values, True or False, and to update those values with a Checkbox....
70 views

Count participation of variable list

I have the directed edges of a graph given by a list of variable (vertex) pairs. ...
73 views

Generating a large table of values and selecting some of them following some condition

I am working on a problem where I have to generate a table of components while each component of the table has 18 entries. Six of the indices among 18 run from 0 to 1 while the other 12 can take ...
67 views

Defining an array of functions with multiple indices and one variable [closed]

I have a function f of one variable x and a 4 x 3 array ...
201 views

How to parallelize a Do loop containing URLFetchAsynchronous?

I'm have a simple piece of code: results={}; Do[If[!FailedQ[g = grab[i]], AppendTo[results, g]], {i, 2000000, 3000000}] I had thought that the simplest way to ...
56 views

How align Table column on decimal point yet use text styling?

Form a table such as: data = Transpose[{Range[0, 5], RandomReal[{-5, 5}, 6]}]; Display it by wrapping with TableForm. Is ...
128 views

Is there a nice way to display big nested tables?

I have a really big nested table. I can copy my code here if you wish, that is not a problem, but it will be a lot of it and I am not sure if it makes sense. the end expression is this ...
87 views

Is there a way to create a table where the number of dimensions is parameterized?

I'm imagining the likes of this: ...
40 views

Dot production associated with comparison process of different matrices eigenvectors

With thanks to Guess who in the link module using.. We created functional 5*5 matrices: ...
71 views

Module using for creating a table [closed]

I want to have a 4 tables with using of module. Unfortunately I don't know why doesn't it work ...
88 views

Change data form Table to Array

Ok, I am trying to figure out how exactly to change the data from Table such as ...
48 views

Find element in the table

I have a table ...
68 views

creation a table from a default module [closed]

I have used of bisection method for finding the root of a function: ...
28 views

Exporting data in an output file from a Do-loop evaluation [duplicate]

I want to transfer the output of the following evaluation into a two-columned data file where the first column will be values for a and the second column will be ...
85 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 $(i,j)$...
86 views

Formatting a table of values

How do I display a list of values $\{a_1,a_2,\ldots,a_n\}$ in a two column format? --------- 1 | a_1 2 | a_2 3 | a_3 ...... n | a_n I tried ...
64 views

Controlling the evaluation of other arguments in pure functions [duplicate]

I have a piece of code where I would like to do the something like the following: ...
76 views

Equation Autogeneration

The following is resubmitted as edit here to reflect suggested formatting corrections so indentations separate the lines neatly. I also fixed the unknown D variable which I actually meant to state as ...
132 views

Plot a histogram according to a set of rules using data from two tables

Let's say I have two Tables A={1.0,2.3,1.5,3.0,1.1,} , B={2,10,3,1,0} and I'd like to plot a histogram in the following way: ...
132 views

Plotting entries of one table vs entries of another with a condition on a third table

I have three Tables, say, A={1,2,3,4,5}, B={1,2,3,4,5}, C={1.1,2.2,17,1.5,5} of the same ...
199 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: ...
81 views

Performance of a bootstrap - time of computation not linear with number of iterations

I'm doing a bootstrap based on this thread with the following code (file.txt here): ...
179 views

ParallelTable slower than Table in the presence of an Association?

So after testing some things I am completely reformulating my problem. First an example ...
246 views

Create a table of Mean Values and Standard Deviations from data list

I need to create a table of the Mean Values and Standard Deviations of 18 columns of data from a table. I know how to compute the Mean and Standard Deviation for the different columns, but am unsure ...
48 views

Issue with Table [closed]

I have a quick question about using the table command in mathematica. Suppose that I define ...
67 views

List manipulation performance or how to make independent list copy

I have a task to solve some system of equations with NSolve and print graph of it, depends on parameters. Something like this (maybe it is not a good example and does not always have a solution, but ...
55 views

Generating multiple tables dependent on random variable in loop

I have the following code: ...
314 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 ...
95 views

Fast construction and reshaping of large tensors

I'm trying to construct a large matrix which is derived from some higher rank tensor (the rank of interest to me changes case by case, so it needs to be a general method). Currently, the process of ...
106 views

Why isn't Table iterator value inserted in failed NIntegrate arguments?

Consider this simplest example: Table[{z, NIntegrate[f[x], {x, 0, z}]}, {z, {1}}] Here f is not defined, so ...
90 views

Is there a way to convert a string to a Table indicator? [closed]

I have a list like this: list = {"k1","k2"} I want to use the elements in the list as Table indicators: ...
35 views

Fibonacci series up to 300 terms [duplicate]

I tried to generate a list of Fibonacci numbers up to 300 terms and gets a runtime error. f[0]=0; f[1]=1; f[x_]:=f[x-1]+f[x-2]; Table[f[x],{x,1,300}] Is there ...
185 views

Slicing multidimensional table

Say I have a multidimensional list created in the following way grid= Table[{i, j+1, k+2}, {i, 0, 1}, {j, 0, 1}, {k, 0, 1}] grid={{{{0, 1, 2}, {0, 1, 3}}, {{0, 2, 2}, {0, 2, 3}}}, {{{1, ...
89 views

Importing Data Issue, Breaking Up Elements

I am trying to import a comma delimited text file as a Table and I am having two issues: First, the file imports all of the numbers that should be separate columns as a single string. This is not ...
104 views

NSolve and Loop - getting error that does not occur with single instance

I am having difficulties getting this code to work. Code: ...
347 views

Usage of Piecewise/RSolve to solve an equation based on condition

I am trying to compute price of call option on a stock using the finite difference method. I have a VBA code for it, and I am trying to find out how I can use Mathematica memoization functions and ...
84 views

Table of ParametricPlots crashes Kernel

I can usually crash the Mathematica Kernel by using Table to generate a List of ...
72 views

Matrix iteration failing after second step

I am calculating 11x6 matrix using different logics as in below code. Problem is in Do loop in below code where I have two different criteria to update matrix "fd". I am expecting logic in IF which ...
66 views

How can I manipulate this list?

I performed a loop with Table where I solve a system of 4 equations that depends on two parameters: eta and p. I create two lists for each parameter as follows: <...
73 views

Delete permutations of subtables in a table [closed]

I've got a table of tables: $A=\{\{a,b\},\{b,a\},...,\{a,b,c,d,e\},\{e,d,c,a,b\},...\}$. How do I do to remove backward duplicates, or more generally permutations of duplicates in the table? For ...
57 views

172 views

How to apply list of values to a list of functions

I have the following: first= {1+a,2+a,3+a,4+a} and a list t={0,1,2,3} I want to evaluate the first element of "first" at ...
90 views

Data Table Manipulation in Mathematica 10

I would like to select columns from a table by column name. I tried the solution described here: Data Table Manipulation in Mathematica: Step 2 . I am using Mathematica 10. (I would write a comment ...
26 views

How do I set a PlotStyle when plotting a Table of functions? [duplicate]

I want to plot several functions each with its own color. A MWE is as follows : Plot[{2 x, 3 x}, {x, 0, 1}, PlotStyle -> {Red, Green}] which works fine. Now, ...
76 views

ListLinePlot plots my table, but the table doesn't contain numerical values

I am trying to export a table of data to file, but the code does not appear to be returning numerical data even though ListLinePlot can plot it. Can you please ...