# All Questions

429 views

### Export to Excel gives error for large lists

This is my data mwedata.dat I do this: ...
1k views

### Poisson solver using Mathematica

I am looking for some help with a Poisson solver I am writing in Mathematica. The code is quite long with Arrays plugged in, so the full details can be found at http://pastebin.com/uSrSDcW6 I am ...
2k views

### Will Mathematica install and run on Raspberry Pi computer?

My club is considering buying a Raspberry Pi computer for tinkering. Can Mathematica be installed on and ran from it?
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466 views

### Plotting multivalued function using ParametricPlot

I'm having a bit of trouble making a ParametricPlot from two curves. I defined two functions p and g as: ...
234 views

### WolframAlpha queries unevaluated despite internet connectivity?

WolframAlpha is a built-in symbol in MMA8, yet expressions with WolframAlpha and the equal sign operator remains unevaluated ...
764 views

### 1D Euler Equations

Is it possible to accurately solve the 1D Euler equations in Mathematica using NDSolve? For example, let us consider the problem given here: http://www.csun.edu/~jb715473/examples/euler1d.htm Using ...
436 views

### Scaling edge thicknesses

UPDATE There may be some confusion as to the specification of the problem. kguler's answer doesn't really answer the question. I'll try to elaborate a bit at the bottom of the post. One problem ...
653 views

### Simpler way to fill date gaps with zero values

One basic problem when working with data like sales and dates is the case where you dont't have sales in all days, so you have to fill it to take information as average or to make a plot. See this toy ...
438 views

### Implementing a LineStyleFunction for line plots

I have data in the form: {{0, 3, 4}, {1, 3, -1}, {2, 4, -1}, ...} and I would like to implement something similar to ColorFunction for the style of a line. ...
2k views

### Eigenvalue / Eigenvector Calculation

I'm currently trying to compute the three smallest eigenvectors for a 34 by 34 matrix. While I was expecting this to take some time, Mathematica has been running for the past 3 hours, which seems ...
4k views

### How to find circular objects in an image?

How could I use morphological processing to find circular objects in an image? More specifically, I need to detect road signs. I need to get the "80 speed limit" sign from this image:
582 views

### Unexpected results from NDSolve

I am trying to solve a stiff reaction diffusion system with NDSolve. However, it does not produce the expected results. My problem is a spherical cell with 5 ...
584 views

### MovingAverage[] and Fit[] with data containing DateLists

I have data which has the following appearance: data = {{DateList, Real}, ..., {DateList, Real}} It's easy to visualize the data by using ...
199 views

### Forcing efficient numerical arrays

I encounter strange behaviour of Mathematica when evaluating multi-dimensional arrays of double-precision data. Mathematica can express large arrays of machine-precision numbers using a specialized ...
388 views

### Why is AstronomicalData so slow?

I'm having trouble getting some pretty simple functions using AstronomicalData to perform at anywhere near the speed I need them to. For example, I have many ...
853 views

### How do I get rid of a “jump” in my plot?

How can I prevent plotting functions from "connecting" inside a plot points that should "wrap around" outside the plot? For example, how do I eliminate the horizontal lines running across the ...
294 views

### Asymptotic Rate of Growth

How can I calculate the Asymptotic Rate of growth of a function, for instance like: $X^3 - X^2 - X -1$ EDIT: For instance, as you can see in this graph, after the 1200 the function approximates to ...
299 views

### saving Manipulate data inside a notebook

I want to send a few Manipulate Plots and regular plots to my advisor in a notebook. I ...
341 views

### How to implement hive plot for graphs in Mathematica?

I'm trying to implement a version of the hive plot advocated in [Kryzywinski, et al., 2012]. There are many examples of such graphs on the author's webpage. It would be good enough for me to have ...
227 views

### Customizing FrameTicks in DistributionChart

So I have been fighting with this for a while. I'm trying to get custom frame ticks on both the left and right side of a DistributionChart. It's not going very ...
175 views

I was creating some custom notations using the Notation package and it works fine. I put it in my default personal package, and it loads fine on Mathematica's startup. To make it complete I need just ...
478 views

### Easy way to export Graphics3D as triangles with VertexNormals?

I would like to export an arbitrary Graphics3D object as a text file containing: list of vertices vertex normals triangle faces ...
677 views

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1k views

### How can I connect to a remote machine?

My friend and I are trying to set up remote kernels. He has a server at home running 1 kernel off of a Linux-based server. We're both on 8.0. I manually set ...
4k views

### How to play with Facebook data inside Mathematica?

I saw this post from Wolfram here and I would like to know how to import facebook data into Mathematica.
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### Launching remote kernels - will it help RAM needs?

Given the exasperating RAM needs of my Mathematica program, I contemplated launching remote kernels to run my Mathematica script. This is a two part question: Part 1 If I launch a remote kernel(s), ...
163 views

### Test First row of matrix

What is a good way to test the first row of a Matrix to check if one of the values equal a value. For instance, In this example, I want to get vector in the second row that has the bigger value in the ...
320 views

### How to improve this dynamic progress bar code

I created this progress bar to use in my codes: ...
2k views

### Factorisation diagrams

Here is a way to visualize the factorisation of natural numbers. How do we get this or a similar kind of output using Mathematica? See the list of images generated for number from 1 to 36:
310 views

### Modules that initialize themselves on first call

I use a lot of functions that extract a specific data item from a file with many data items. I want these functions to load data (slow) and return the item (fast) on first call, but just return the ...
1k views

### Get x and z coordinate from an image and make a parametric surface

In this blog entry, this step is mentioned: I grabbed an image of a Peugeot wine glass from the web and used the Get Coordinates function to digitize its outline, which I fed to Interpolation to ...
656 views

### Don't simplify an expression

I have an expression that I want Mathematica to fully expand without any simplification afterwards. I want the output to look like the following example. ...
148 views

### Intersection of conditions

If I have a list of conditions: {cond1,cond2,cond3} and I want to use an If[] statement to test the intersection of these ...
647 views

### ListPlot with Joined set to True

Let f[x_]=9x^2-2x-3; I want to make a table of f at x ={-1, -0.5, 0, 0.5, 1, 1.5, 2}. ...
1k views

### ColorFunction in Histogram[]

Let's say I have a Histogram: Histogram[RandomVariate[NormalDistribution[10, 2], 500]] and I want the bars positioned to ...
2k views

### Parameters in plot titles

My issue is how to mix strings with variables, specifically in the context of PlotLabel: I can put a string as my plot title, and I can also put a variable as a ...
635 views

### Dynamically remove element from list based on test

Suppose I have a list l = {a, b, c, d, e, f....} I would like to remove one of each pair {x,y} if some function ...
3k views

### How to generate a random tree?

Is it possible to generate a random tree without explicitly constructing a random adjacency matrix that satisfies tree properties? How about a random directed tree? Edit: incredible answer by ...
1k views

### Improving NDSolve speed for heavily stiff problems

Having looked around the intergoogles and Mathematica.SE, I thought I'd pose a question with a minimum working example. Here is the situation I am trying to improve: I am solving a 4th order non ...
198 views

### What BarChart Option controls Joined line thickness?

Is there a named option that controls the thickness of the line segments that appear in BarChart with options ...
243 views

### How to partition MatrixPlot graphics?

Is there an easy approach - hopefully built-in - to partitioning MatrixPlot graphics into rows or columns (or both) of graphics sharing the same underlying options? ...
311 views

### Plotting two functions with dependent input function

I have defined a function: myJ2[n_] := 1/n* Total[RandomVariate[NormalDistribution[0, 1], n]^2] This is basically an approximation to the gaussian integral. I ...
557 views

### Loop and do operations on Matrix, then graph the results

I'm trying to do some operations to a matrix in a loop, and then I want to graph the results. The results are pair of numbers. Can I store the results of each iteration on "something" and the use ...
253 views

### Scale plot display area (within the frame) [closed]

I have 2 data sets of equal length. I've done a LinearModelFit of them which gives me: ...
62 views

### Make PlotMarker explanation [duplicate]

Possible Duplicate: Creating legends for plots with multiple lines? I have a ListPlot of data points. To distinguish between datapoints coming from different sources, I give them different ...
869 views

### How to vary color of fill between listplots based on y-distance between them

I have two lists with the same x-values but different y-values. I have used ListPlot to plot and fill the space (line) between them; however, I would like the color ...
378 views

Bug still present in version 10 under Windows. In a recent posting, Belisarius solved a problem related to the display of arrows on the x and y axes by setting ...