# All Questions

420 views

### Efficiently extracting an array subset given a separate array

I have two arrays. The first array consists of tens of millions of rows and three columns with a string, a number, and a string. ...
270 views

### How can I compare the previous value and the current value implemented during NestWhileList?

I am trying to write a part of my code. I am using NestWhileList. However, I couldn't find out the right syntax for testing. It should compare previous result and current result and continue if it is ...
293 views

### Changing parenthesis size for typography

I am using Mathematica to layout some mathematical formulas for publication. The guidelines specify that in case of nested parentheses the encompassing ones need to be bigger than the inner ones. So ...
193 views

### How to import data from Blender or 3DS max file? [duplicate]

I would like to ask how to import a file from Blender 3D application and make a isolines plot. What I intend to do is to make a terrain model in Blender, and make a topographic map of it in ...
419 views

### How to eliminate the zero real part of a purely imaginary number?

In Mathematica 9, a purely imaginary number, e.g. 0.9 I, will display as 0. + 0.9i in the output form. How can I eliminate the ...
225 views

### Syntax error: newline character interpreted as multiplication

I'm getting this error in Wolfram Workbench, and I don't know where it comes from: "Syntax error: newline character interpreted as multiplication" This error happens around an If[] function, in a ...
656 views

### Percentage axis ticks

To create a percentage axe in some plot I use this Ticks configuration: ...
101 views

### A good choice to find solutions of ODE

In order to rephrase the question. I would ask you to take a look at the following problem: I have this system of ODE:  \begin{cases} \dot{x}(t)= x(t)[r_1(t) -b_1(t)x(t- \tau(t)) - c_1(t)y^m(t)] ...
922 views

### Can mathematica solve this equation?

I have the following Mathematica code to solve an equation coming from isoparameteric finite element for quadratic tetrahedron element. I need to get the iteroplation fast and accurate. I only find ...
472 views

### Grid layout problems: different sizes when rendering on Mac and Windows

From the documentation for ItemSize: {w,h} make all items the specified width and height and In Grid, w is measured in ems, and h in line heights. This ...
296 views

### Use of Mathematica to generate report

I would like to generate a report for codes written in Mathematica, but I don't see basic features such as: Table of Content generator List of Figures Abstract Bibliography and other standard ...
325 views

### Is there a concise form of Which or similar conditional?

Suppose that I want to write a function fun that takes an Integer num as input, and returns ...
378 views

### Specifying unlabeled FrameTicks in Plot

I am running Mathematica 7. Suppose that I plot $\sin(x)$ for $x = 0..10$ and frame the plot using Frame -> True: ...
248 views

### How to view all graphs available in GraphData?

Is there a "gallery" view of all the graphs available in GraphData? I realize that some graphs may not lend themselves to such representation (e.g. some may have ...
368 views

### Compiling LinearSolve[] or creating a compilable procedural version of it

Earlier today I had a discussion with a representative at Premier Support about the 2 questions I've asked here over the past couple of days: Seeking strategies to deploy a function securely ...
562 views

### How to add derivatives to Hermite Interpolation?

I try to use InterpolatingPolynomial[{f[1]=2,f'[1]=3,f[2]=6, f'[2]=7, f''[2]=8}, Method->"Hermite"] in WolframAlpha, but it's wrong.
2k views

### How to modify function argument?

Usually in programming languages, function arguments are normal local variables, which can be modified. Is this not true in Mathematica? ...
559 views

### Problem with NIntegrate in NonlinearModelFit

We are receiving many error messages when using NIntegrate with NonlinearModelFit. Here is a much-simplified version of the code. It arrives at the correct answer after several messages saying that it ...
369 views

### How to figure out how to make WolframAlpha work predictably

I'd like to get football data out of Wolfram|Alpha and into Mathematica 9, but I'm having some minor difficulty. Naturally, I'd like to know how to accomplish this task (details below), but I'm more ...
806 views

### How can I get a running sum for a list?

I've got following data I'm reading from a file: ...
1k views

### Ways to compute inner products of tensors

One way to evaluate the following sums is combining Table and Sum: $u_{abcd} = \sum_{e=1}^3 v_{aeb}w_{ced}$ $q_{ab} = \sum_{d,e=1}^3 v_{d e a}w_{deb}$ It will look like ...
265 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: ...
741 views

### Adding precision for the calculation of a function

I have some function $f(x)$ I wish to evaluate, which is yielding divide-by-zero errors for sufficiently large inputs. How do I increase the precision with which this function is evaluated in order ...
575 views

### How find the first element of a list greater than zero (or another criterion) when there is a symbol in the list?

I need to find the position of the first element of a list that is either greater than zero (or some other criterion) or a symbol. Something like ...
332 views

### What is the best way to export a table of numerics with legends ready for Word?

I want to put my table output into an MS Word document without having to edit it in word after, so I want to export it ready for Word in final version with complete legends and title. Is it possible ...
643 views

### How to get shadows in Graphics3D?

It was a shock to me when I found that in Graphics3D a surface is always transparent to the light sources: ...
9k views

### Placing x-axes label below rather than at end of axes

By default Mathematica places the x-axis labels at the end of the axes like Googling has suggested a way around this is to use Frame- for example ...
1k views

### How can I get Mathematica to produce better Fortran code?

I am new to Mathematica and I am trying to get to it to produce some expressions in Fortran code. However, it seems that Mathematica will output duplicated expressions, that is, expressions the need ...
839 views

### Optimising 2D binning code

I have a set of (x,y,z) data, 45,000 to be precise and I want to bin the z values in 256 equidistant bins based on their (x,y) values. The final array should be a set of 256x256 array with each slot ...
356 views

### Handling holidays in financial time series

I have two lists: list1and list2, which are financial time series with only 2 variables—date and price. The problem is: these ...
58 views

### Fit text to a path [duplicate]

Possible Duplicate: Movable text on a curve This is a common feature among vector-based graphics suites (e.g. Illustrator), so I was wondering how it could be done in Mathematica. Here's an ...
168 views

### func::usage needs to be run twice? [duplicate]

There is an annoying problem that I can't figure out why it's happening. I have defined a usage for a my function tensorA: ...
147 views

### need help with finding right syntax for an IF statement

I am working with two multi-variable functions A and B. They depend on some counting factors ...
560 views

### How to write this without For loop

Suppose I have a few lists of numbers and want to exponentiate element-wise, then sum up everything into a polynomial. For example, if I have ...
313 views

### Suspecting bug in Parallel Framework

I've reduced my actual problem to: ParallelEvaluate[ Module[{slot=1}, Slot[slot] ] ] gives error messages that I think shouldn't be there. It seems I can ...
700 views

### How to stop the Kernel from running wild?

How to abort or stop this (accidently large defined) SparseArray production? s = N[SparseArray[Table[{2^i, 4} -> i, {i, 30}]]] Alt+. or Alt+, seem to give ...
223 views

### Is it possible to use PatternTest and Optional value on one Pattern simultaneously? [duplicate]

Possible Duplicate: How to Combine Pattern Constraints and Default Values for Function Arguments First a simple example: define a function "add" with two arguments, and its second argument ...
1k views

### What is the best way to make a plot complete with legends so it is exported-ready for Word?

I want to put my Plot output into an MS Word document without having to edit it in Corel first, so I want to export it ready for Word in vector format complete with legends, expressions, axes, and ...
23k views

### How to create a new “person curve”?

Wolfram|Alpha has a whole collection¹ of parametric curves that create images of famous people. To see them, enter WolframAlpha["person curve"] into a Mathematica ...
309 views

### Is it possible to induce Mathematica to chop off parts of Graphics objects that exist outside of a Frame?

I am running Mathematica 7. In a Graphics environment I am setting Frame -> True (and using ...
1k views

### Can I improve the importing speed of Excel data?

I have data in an Excel spreadsheet that has 4 rows and 1,000 columns. I am using Import as follows: ...
300 views

### Concatenate strings from different levels of list

After a lot of trouble I've finally come pretty close to what I want to do. I now have a list that looks like this: ...
110 views

### Confused behavior using Dispatch to sort one list relative to another

I have a need to sort the entries of one list into the same sequence as the entries in a reference list. Because I have rather large lists involving strings, I'm trying to use Dispatch to accomplish ...
231 views

### How to automate x[i]→x_{i}?

I have several Mathematica expressions in which subscripts are expressed with square brackets. E.g. x[12] is meant to represent x12, etc. If I evaluate ...
147 views

### NumberForm and units

NumberForm can be used to print Quantities to a specified precision. For example, x=Quantity[5.123456789,"Meters"]; 5.12346 m Print[NumberForm[x,{4,2}]] 5.12 m ...
207 views

### Changing size and color of a Text on version 9

I am running v9 on mac pro and think that I am doing something wrong. When commenting the solution of a particular exercise I add a text cell (command 7) and type the comment which is nothing more ...
495 views

### How to format a large Number

There is a large number a = 123456789012345678901234567.123456789012345678901234567 By format with AccountingForm ...
208 views

### What's the kernel launch command syntax?

I want to configure a remote kernel, but the box it'll run on doesn't have a fixed hostname or IP address. I can however get its IP address by running a shell script. (For the moment I'm only worrying ...