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3
votes
1answer
424 views

Exporting/Importing a Table of complex numbers

I'm generating a long table of list of the form: PN={{1,2,1+i},{3.5,2.6,2}...},{...},... Using: Export["PN.dat", PN, "Table"] ...
3
votes
1answer
41 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 ...
2
votes
4answers
206 views

How do I find the position of the maximum value in each column of a table?

Given a table of values, I know how to find find maximum values, but how do I find the position of the maximum value in each column. For example, given ...
2
votes
3answers
207 views

how can I generate a sequence of assignments?

I want to make a sequence like follows r[1]= r[2]= r[3]= r[4]= .... r[n]= The above r[i] represents coordinates which I have ...
2
votes
3answers
167 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 ...
2
votes
2answers
505 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
317 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 ...
2
votes
5answers
174 views

Is there a way to use Table[] without having to calculate my function twice?

I'm trying to use Table[] more to be more in the spirit of Mathematica. So for example, I might replace this piece of code: ...
2
votes
2answers
131 views

How to initialize several elements per iteration with Table?

I would like to initialize this kind of vector : {0,0,1,1,0,1,0,1,1,1,1,1} with Table. I tried ...
2
votes
2answers
158 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 ...
2
votes
3answers
311 views

Plotting many tables in a single plot

I have several lists. ...
2
votes
3answers
91 views

Table is divided into several sheets when imported in excel

i wanted to calculate a Student-t table with ...
2
votes
2answers
60 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
562 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 ...
2
votes
2answers
325 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 ...
2
votes
2answers
205 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 ...
2
votes
1answer
184 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 ...
2
votes
2answers
181 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.: ...
2
votes
1answer
200 views

Find points on the surface of a Graphics3D object

If I have a Graphics3D object that was generated from manipulations to PolyhedronData rather than via an explicit equation, for example the Spikey (for which the entire code can be found here The ...
2
votes
2answers
162 views

How can I create a table of sliders?

I'm trying to do the following: I have a table: w = Table[ToExpression[ToString[h] <> ToString[i]], {i, 1, Length[c]}] This table is suposed to generate ...
2
votes
3answers
104 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
186 views
2
votes
2answers
548 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: ...
2
votes
1answer
199 views

How can I create a colour image using raw black and white data? (FITS data cube)

I have a data cube containing pictures of a galaxy across a thousand wavelengths. I want to take the data for the image slides in the red and blue parts of the spectrum, and have them represented in ...
2
votes
3answers
179 views

How to make a defined symbol stay in symbol form?

How to make a defined symbol stay in symbol form? w = 3; g = 4; {w, g}[[2]] 3 I want the output to be ...
2
votes
1answer
396 views

How to convert an output to a graphic that can be selected like a plot?

EDIT: István Zachar informed me of the Rasterize[] command, which does exactly what I need. Danke! I have a self-built function that uses Grid[] to create a table that is more presentation-friendly ...
2
votes
2answers
81 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 ...
2
votes
3answers
77 views

Reduction of repetitive calculations in Table

If I generate two tables inside a function which are function[n_, x_, y_]:=( table1 = Table[i* x/n^x, {i,1,n}]; table2 = Table[i* y/n^y, {i,1,n}]; ) where ...
2
votes
2answers
100 views

Specify column width while exporting

I am trying to export a set of data into a file but I can not force mathematica to keep a certain width for each column. For example, when I export a table: ...
2
votes
2answers
365 views

How to export a table of complex numbers?

I'm having problems exporting a table of complex numbers. I have: ...
2
votes
1answer
218 views

Mathematica 7: Problems when evaluating Fourier inside a ParallelTable

after I got such a great response for my first question on this site, I'm very encouraged to asked my second one! So here it is, very generally: To speed up a "row-wise" (i.e. 1D) operation on a ...
2
votes
1answer
80 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 ...
2
votes
1answer
115 views

Export CSV from tables

I am reading my csv which looks like: float,float,float,integer,boolean I read it with: ...
2
votes
1answer
640 views

How to export/import function values [duplicate]

I have a function with two variables: f[x_,y_]:=f[x,y] = ... I calculated some values (they are fractions like 435345345/3424242424) and would like to store the ...
2
votes
1answer
38 views

Plot several columns of table with variable number of columns and display the legend accordingly

I use this command to plot all values from the 1st column of Table "results" against all values from the 2nd column: ListLinePlot[{results[[All, {1, 2}]]} Now, ...
2
votes
1answer
98 views

Multiple plots using dynamics

I am studying Dynamic and DynamicModule, and I have tried to make a simple plot of a family of real functions. The number of functions should be a dynamic variable controlled by a slider. So I have ...
2
votes
1answer
40 views

Can I use what “headerlines” removes from a CSV as TableHeadings for the table I create from that File?

I am reading in some data from a CSV file that has a line which gives titles to each "column". Here is an example: ...
2
votes
2answers
108 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
2answers
211 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: ...
2
votes
1answer
152 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 ...
2
votes
2answers
151 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 ...
2
votes
1answer
84 views

Minimize amount of evaluations with fold/table/thread or something else

I can't figure out how to use fold/table/map/distribute or whatever to get this: ...
2
votes
1answer
187 views

How to parallel this nested table efficiently?

I have an 8 core CPU and want to parallel evaluate the following nested Table Table[Table[expr[i,j], {i,1,10}], {j,1,4}] But ...
2
votes
1answer
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 ...
2
votes
3answers
65 views

How to manipulate one column of a table using the value in another column

Let's imagine I have the following table structure data = {{a, b}, {c, d}, {e, f}}; and I want to transform it into the following table ...
2
votes
1answer
69 views

Listplot x axis - Using tranpose of two tables?

I'm trying to augment the x axis of a listplot to fit the number of steps. Secondly, since there are a large number of steps (50), there will be 50 ticks which will make the graph messy. How do I get ...
2
votes
2answers
103 views

How do I assign specific data points in an array to a new array?

I am trying to learn how to script/program in mathematica and I am retyping some simple C and FORTRAN programs into Mathematica as a way to learn. I am writing a Monte Carlo code to calculate the ...
2
votes
0answers
104 views

Want explanation of when different looping constructs are appropriate [duplicate]

For example when would you use a Do loop over a For loop? For which tasks would you use Map, ...
2
votes
0answers
127 views

correct usage of ParallelTable

I am trying to parallelize my script. Here is a MWE of how I have done it: ...