# Tagged Questions

105 views

### Improving the speed of evaluating Table with nested functions

I am a Mathematica novice working with a stack of 1024 x 1024 WatershedComponents (or MorphologicalComponents) label matrices ...
330 views

### A problem involving classification of data

Toady, I encountered a problem while trying to classify certain data. I have the coordinates of six points. ...
351 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. ...
306 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 ...
48 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 ...
23 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, ...
346 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. ...
75 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 ...
165 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 ...
97 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: ...
166 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 ...
467 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 ...
295 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 ...
134 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 ...
105 views

### Delete False values from a list [closed]

I have table: t = {False, False, False, a <= 456, a <=567, a<= 897} I want to delete all values which are 'False' and make my table to looks like: ...
69 views

### Testing a List inside of an Table if it is != 0 [duplicate]

I'm new to mathematica so I hope this is not a too stupid question, but I couldn't find a solution in the mathematica documentation. I've got a normal table, initialized with "0" as entries. In the ...
213 views

### How to convert the following list into a LaTeX table?

How to convert the output of the following code In[43]:= Func[x_]:=Select[Range[x],Total[IntegerDigits[#]^3]==#&]; Func[1000] which is Out[44]= ...
43 views

### Store results of inequality [duplicate]

I eveluated some values using Reduce commend and I store them in a Table ...
109 views

### How to create 2k sized vector in k sized loop

I want to solve a system of simple differential equations. At some point I need to solve non-linear system of algebraic equations with Newton method. I would like to efficiently create a right hand ...
187 views

### Interactive grid

I would like to create an interactive grid, whereby one number from a grid is selected by the cursor ("3" in the example below), and all other numbers in the grid are highlighted that are related to ...
144 views

### Combining graphics & lists / tables

I have: created with: ...
132 views

### Efficient Table Generation & NDSolve Error

I'm currently working on solving an SEIR model with data from the CDC. I've created a function to calculate the Square difference for the model and want to create a table of values for the 4 variable ...
27 views

### Eliminate some value from a matrix [duplicate]

I have a function that return a table consisting of a 2D points. These points are either {x,y} or {0,0} ...
162 views

### Taking a percentage of data from a list or a table

I have a list of data and for the calculation I only need the a of portion of the data. I know that Take[data, {1,100}], for example, is taking line 1 to 100 of the ...
204 views

### Deleting parts of groups that do not have equal dates

Find the intersection of dates within the pair and remove the other dates & corresponding prices. Also keep the list in same format as it currently is in. Let me explain: Each stock has closing ...
133 views

### Creating a Table of Items for GIF creation

I want to create a table as shown below so that the steps from the first item to the second item, and the second item to the third item, etc. can be animated. I am not at liberty to post tested ...
45 views

### List elements and iterator name collision [duplicate]

Let there be two lists, exp = {{i, i}, {j, j}}; exp2 = {{r, r}, {o, o}}; and there are two Table commands to access them. Then, ...
170 views

### Replacing all values in a table > $T$ [duplicate]

I want to generate a table of Euclidean distances from the points in a list to a given point, e.g.: ...
74 views

### How does PolarPlot render a nested list of functions?

I am getting unexpected plots from PolarPlot when I provide a list of functions that I generate using Table. I suspect the ...
83 views

### order items of a table

I am trying to change order of a table. ...
81 views

### Sublist inside simple list

I have a doubt to confirm. Let there is a list f = {{l}, {c}, {d}, {e}, {1, 2, 3}, {3, 4, 5}} And I expect it to be traversed as a normal list which I can do ...
724 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 ...
254 views

### Create a table with inline conditions

I am trying to create a table with conditionals inline. For example, I'd like to create a 2 dimensional table like this: ...
286 views

### How to populate a table using a rule replacement

I am trying to populate the rows and columns of a table by using a rule replacment. To generate a table that looks like this For example Sc would be row 1, column 1. An example of a record looks ...
715 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 ...
154 views

### How can I create a new tables out of a table and plot it

I have the following problem. I have a table, call it m, which is labelled by 3 indices (say i,j,k), each of them running from 1 up to 100. I would like to be able to construct a new table which would ...
308 views

### Summation over 3 lists

I have three lists. As an example, a = {10, 5, 6, 8, 7}; b = {4, 8, 9, 7, 9}; c = {7, 5, 12, 4, 1}; I want to get x(i)=\sum ...
29 views

### Error in extracting a column [duplicate]

I imported excel data to Mathematica using this command. kuruzD = Import[ "C:\\Users\\TMH\\Documents\\Problem Set 4\\kuruzData.xlsx"][[1]] //TableForm I want to ...
208 views

### Extracting data from a table under conditions

I have a very large table with two columns. Let's say the name of first column is E and the name of the second is P. How can I get the E values when P = 0.
444 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} ...
150 views

### writing a function using multiple variables

I am fairly new to Mathematica and am trying to write a function for the equation: xx = [x/(Sqrt[h^2 + d^2 + y^2]))*(Sqrt[h^2 + (d + yy)^2]) where h, d are known ...
1k 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 $z_2$? ...