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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2
votes
1answer
113 views

Table with some editable cells

I have a table: I want it to be editable only where the zeros appear. I read this post Generating an editable table that can be used as input because it's almost exactly what I want, but I couln't ...
5
votes
8answers
541 views

How to add a column to a table that counts the number of times the lines appear?

I am at a complete loss at this. I have a table with 2 columns and n lines. Some of the lines are repeated. What I want to do is add a new column that counts the number of repetitions of each line. ...
2
votes
2answers
323 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 ...
1
vote
2answers
163 views

dropping a row with at least one value larger than a particular value

So for instance I have M X N table. I want to drop any row which has an element larger than, say, one in the second or the third column. I guess I have to do some sort of pattern matching. But not ...
1
vote
1answer
78 views

Removing outermost braces [duplicate]

I want to calculate the Kronecker product of several matrices in different orders. the number of these matrices must be changeable. ...
2
votes
3answers
133 views

One-column table not properly displayed by TableForm

I want a table with a single column of data, and with headings along both the rows and the column. One might expect it to work like this: ...
2
votes
1answer
245 views

Using a web-crawler to search website for occurrences of keywords

Given this list of cities: ...
2
votes
1answer
186 views

Loop in solving multiple matrix calculation

I am wondering is there a way to use loop, like Do, For, to rewrite the last line in the code. I tried to use ...
0
votes
0answers
31 views

Table of values for functions with random variables [duplicate]

I'm trying to get a table of values for functions with random variables. First of all, i have a function like that: ...
1
vote
2answers
236 views

A fast way to compare interval

I have a list of intervall. Some of these intervals are disjoint, some are overlapped and some are included in others. To leave no ambiguity about my explanation, you can see the following examples: ...
0
votes
1answer
231 views

Factor vector out of a matrix

I am wondering how to factor a[1],a[2],...,a[4] out of sim so that I can write sim as the ...
0
votes
0answers
35 views

Adding columns of data to a matrix [duplicate]

I create a matrix of values using Table. Here's my code: ...
1
vote
0answers
116 views

scatterplot from 3d table

I am using this code: ...
0
votes
1answer
83 views

Strange behaviour of “Make Table” with exponential function

I am trying to create a simple interpolation of 1-Exp[-x^2] function, over the logarithmic grid, but I am stuck due to some unexpected behaviour: ...
0
votes
1answer
127 views

Dealing with nested lists

This question is strongly related to: Map and Apply a function on a nested list I am in a bit of a rut in terms of my MMA skills and looking to improve my coding. I've realized that rather than ...
4
votes
2answers
667 views

What is the Mathematica way of joining two tables?

Is there a special Mathematica way of joining tables of data together, so that I would get similar functionality as if I was running a database with sql? For example, I have one particular table ...
0
votes
1answer
79 views

Drop last element of parts of a list [duplicate]

just a simple question for now I guess: I have a list: list={{1, 2, 1}, {1, 10, 1}} I simply want to Drop the last element of the two entries of the list, that ...
1
vote
3answers
199 views

How to print horizontal lists in TableForm?

How to print the table with the first column as $\{1,2,3\}$ instead of $\begin{array}{c} 1 \\ 2 \\ 3 \\\end{array}$? ...
0
votes
1answer
87 views

Export data as XLS file

data = WeatherData["WMO44207", "Temperature", {{1950}, {2013}}] This list contains 11400 records ... date,temperature value .... I want to export all records as ...
5
votes
2answers
422 views

Labeling a grid

I have m = {{0, -1, -2, -3, -4}, {1, 0, -1, -2, -3}, {2, 1, 0, -1, -2}, {3, 2, 1, 0, -1}, {4, 3, 2, 1, 0}}; And a grid ...
0
votes
0answers
27 views

How to put the values/points in a loop into a plot? [duplicate]

I've already make the do loop..it has 200 points..how am i going to put those points into a plot?do i need to make a list@table before doing the plot?here's my loop example, ...
0
votes
1answer
33 views

How to use more/less black textcolor in function of the value of numbers in a table?

A few weeks ago, I viewed in the Mathematica Documentation any page withmultiple examples using diferent styles dpending on the value of the number in position (i,j), but I can´t remember... and I ...
2
votes
2answers
765 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. ...
1
vote
1answer
92 views

How to create list of delayed rules? [duplicate]

I am trying to make a ButtonBar that prints the name of the card in question. What I have so far is as follows: ...
1
vote
1answer
81 views

Optimizing evaluation time

I have the following code and it takes like foreeeeever to evaulate: ...
0
votes
0answers
61 views

How to compute variances from a matrix/table

I have created a matrix/table with an imported dataset. I want to know what the variance is for 3 values at a time but across 68 columns. I would like to do this in an automated way rather than 1 set ...
2
votes
2answers
167 views

Automatically highlight certain cells

I am looking for a method to highlight certain cells in a table/Grid based on meeting some user defined conditions. As an example: ...
2
votes
1answer
248 views

Export CSV from tables

I am reading my csv which looks like: float,float,float,integer,boolean I read it with: ...
0
votes
1answer
84 views

Creating If statements programmatically [duplicate]

I want to write an algorithm that returns a sequence of numbers, starting from a specified point but stopping once a criterion has been reached. For example ...
5
votes
3answers
344 views

TableForm with a title

My question is rather simple. I want to put a title into a table. For example, consider a list with depth two and a title ...
4
votes
3answers
783 views

Using If statements internal to Table [duplicate]

Is there a way to use If statements with Table? To give a kind of ridiculous example that captures to spirit of what I'm trying ...
1
vote
2answers
149 views

`Slot` (#) interfering with evaluation

In the following I am using one function makeFunc to assemble two functions a[t] and b[t] to ...
2
votes
3answers
175 views

Extracing information from a table

I am new to Mathematica. I have created a table of real numbers. I want to create a new table that contains the set of values of $i$ such that, in my original table, the $i$th entry is greater than ...
0
votes
0answers
907 views

Fastest way to create a NxNxNxN dimensional matrix

I have a function that outputs a complex number Func[x_,y_]:= blah blah; I have constructed a table of all possible values of this function. ...
0
votes
1answer
74 views

Implementation of a Hanning filter

I'm implementing a package for in-house signal processing. I wrote here a quite trivial function implementing a Hanning windowing of the signal. ...
0
votes
2answers
166 views

Selecting index position of data from a table that is less than a certain value

I have a table of numbers with a few thousand entries, and I'm trying to find the first index that is less than a particular value. An example of the table I'm working on is as follows: ...
4
votes
2answers
192 views

How to make sure Table or Do only runs through specific values?

I often need to generate or run through very large numbers of integers (we're talking {i, 1, 10^9} and higher) and want to add certain integers to a list, say ...
2
votes
2answers
908 views

Parametric plot of multiple graphs on the same axes

I'm trying to plot on a single axes system multiple graphs but ran into a problem when tryinf to label my graphs. Here's what I've used so far Mathematica code: ...
0
votes
0answers
199 views

Savitzky-golay filter

How to use Savitzky-golay filter on csv file? I have file.csv in this format: 0.1,1.6,2.8,0 0.2,1.2,2.3,1 0.7,1.5,2.4,2 0.6,1.2,2.7,3 0.4,1.4,2.9,4 0.3,1.3,2.5,5 ...
0
votes
1answer
123 views

Slow evaluation of complicated Table

I have a system of recursive equations x[t+1]:=f[x[t],p[t-1],a[t],a[t-1]]; p[t+1]:=g[p[t],x[t-1],a[t],a[t-1]]; a[t+1]:=h[x[t],p[t],a[t],a[t-1]]; I want to ...
2
votes
2answers
320 views

Converting from TableForm to Grid

I wonder if there is an easy way to convert from TableForm to Grid. I have an existing data format that uses the Table function that I’d like to prettify…. Let’s setup a nested table as follows: ...
0
votes
1answer
74 views

Using Derivative with list in curly brackets

I'd like to make a formula for a sum containing Derivative where the number of arguments in the latter depends on an input parameter n. Also involved is a list ...
2
votes
2answers
72 views

How do I get the heading elements from the TableForm option TableHeadings?

The following, table = TableForm[ConstantArray[0, {3, 3}], TableAlignments -> Right, TableHeadings -> {None, {"One", "Two", "Three"}}] generates ...
2
votes
2answers
575 views

Fast way to extract data from a list

I used data=Table[{i,f[i]},{i,1,n}] to produce a list, here n is greater than 2^20 = 1048576. The function f(N) runs in time ...
5
votes
2answers
304 views

How to create this list more elegantly

There is list containing some $(i,j)$ values of indices. Now i want to create a matrix of dimension n $\times$ m whose entries are 1 for the indices corresponding to the given list otherwise its ...
5
votes
2answers
276 views

Single Legend for a Table of Plots

For this toy problem ...
2
votes
2answers
188 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 ...
0
votes
2answers
164 views

Define a function on a parameter argument set to zero

Say I have an expression (matrix) that depends on several variables. f= {{a, b+c},{2a-b^2,c^5+a b}} I want to define new matrices with the single parameter ...
3
votes
1answer
72 views

Table doesn't replace inside conditionals (If, Which) [duplicate]

This: Table[If[cond, y], {y, 1, 3}] outputs this: {If[cond, y], If[cond, y], If[cond, y]} The ...