# All Questions

1k views

### Thickness of logarithmic tick marks

Bug introduced in 8 or earlier and persisting through 10.4 or later I'm trying to plot a graph wit a logarithmic y-axis. Since I'm exporting the graph to pdf and later printing it, I want to ...
368 views

### Make a scatter plot

Considering I have weather data for last 10 years for London, how can I make a scatter plot that will show the previous day's temperature as a function from today's temperature?
312 views

### Finding average error of the data

Considering I have some data, and I want to fit the data to a linear fit and find the average error from the linear fit, how can I do that using Mathematica? I have ...
123 views

### How can my Manipulate be aware of a local variable inside a nested Module

I have 3 sets of 5 x-y points: RandomInteger[10, {3, 5, 2}] I want to display only one set of points at a time, and use a slider to move on to show the next ...
222 views

### FullSimplify ratio of two gamma functions

I have the following input m = 2; Gamma[n + m]/Gamma[n + 1]; FullSimplify[%] It gives me 1+n For ...
1k views

### How to solve fluid flow problem based on Navier-Stokes equations?

Does anyone know or can provide any examples how fluid flow problem can be formulated and solved in Wolfram Language? Simplest cases of 1D or 2D flows based on Navier-Stokes equations or even their ...
139 views

### Improving the speed/efficiency of multiple (finite range) convolutions for a causal response plot

So I am looking at modelling the response of a system that is excited by multiple pulses over a period of time. The way to find the response at time t is to take the convolution between the impulse ...
90 views

### how to use Tooltip with a Dynamic point

consider this example: ...
172 views

### Random reals according to conditions

I'd like to create a list of triplets $(x,y,z)$ which satisfy the following properties: $$0<x<1/2 \\ 0<y<1/2-x \\ -1<z<-2(x+y)$$ Basically I would like to uniformly generate random ...
140 views

### How to “merge” various graphics 2d into one 3d graphic? [duplicate]

I did some calculations and as result got a 2D graphic, but at the beginning of the work I used a constant parameter. What I want is to make a 3D graphic with this parameter as an axis, varying from 1 ...
3k views

### Convert spectral distribution to RGB color

Presume I have a spectrum as a function of wavelength (an example being the blackbody spectrum): I want to convert that to a single RGB color to display on-screen, i.e. the "color" of that object ...
677 views

### How can one draw a network with nodes and links in a grid shape?

I'd like to be able to use MMa's graphics to make something like this which I know must absolutely be possible (and probably easy) with MMa. I don't actually even need different colors (though ...
89 views

### How to copy text from InputField without adding spurious spaces?

The problem happens when you copy text from an InputField and paste it into another: Mathematica inserts spaces in unnecessary places, such as around any ...
192 views

### Complex result for Real vectors in VectorAngle

I was expecting a real angle using VectorAngle when passing real valued vectors, but I obtained a complex angle: ...
140 views

### Get rid of “Testing Notebook” toolbar

I was messing around with different styles and tried the MUnit style. I converted back to Standard Report but I still see the toolbar for testing notebook. Is there a way to get rid of it?
202 views

### Why am I getting a kernel crash on Chop?

Solve bug (see answer) introduced in 9.0 and persisting through 10.2.0 First post, hopefully I figure out the formatting easily. Please forgive me if this posts ...
204 views

### How can I make a “self-referential” replacement operation self-contained?

Fairly often I find use for replacement rules that call themselves on the right-hand side of the rule, e.g.: ...
1k views

### Test a wooden board's vibration mode

Here is a wooden board, with dimensions shown on the picture below. How we can use Mathematica's newly build-in finite element analysis features to show the different modes of its vibrations. Assuming ...
165 views

### How to ReplaceAll independent of depth?

I have a big list which in principle can be described as this more compact list : ...
214 views

### How do I choose only one branch of ArcTan?

I have a problem concerning ArcTan drawing a graph using ListPlot. I import a table of data: ...
186 views

### Plotting 2D color function on the plane [duplicate]

Suppose p is a some point in the plane. The function f[q] defined as ...
156 views

### Is it possible to Compile the function with string argument? [duplicate]

As we can see from the Compile documentation, the typical arguments for Compile should be ...
497 views

### Using compiled function inside NMinimize

Consider this code: ...
246 views

### Download a notebook (or any type of file) from the cloud

Let us say that I have a Notebook in the Wolfram Programming Cloud called foo.nb. If I try CloudGet["foo.nb"], what I get back ...
210 views

### How to use Compile

Consider the code below: variable = Sin[x]; fun = Compile[{x}, variable ]; fun[1] When I do this I get the error: ...
86 views

### Faster code for solving an equation with parameters

I am new to Mathematica and wanted to solve an equation that depends on parameters. The code is below ...
84 views

### Adding an unused column creates an error in JoinAcross

I'd been having trouble using JoinAcross on two datasets. After going through the answers to my original question and fixing my code, I find I'm now having a ...
58 views

### Create custom mappings of Mathematica Expressions => Java Objects?

I would like to call a JLink-based java function from Mathematica with a Mathematica Span[] object as shorthand, like so... ...
178 views

### Missing functions in the Raspberry Pi V10 release

There are a few Mathematica users beside myself that are running it on a Raspberry Pi, and we found out it does not always perform the same as the Desktop version [1][2]. During the testing of the ...
289 views

### Removing Linear drift from an oscillating data

I have an array of 800,000 data measured at 1.1s time gap. It is oscillating data but has clear linear drift. I want to remove this linear drift. But the estimates by ...
350 views

### How to obtain non-trivial solution of equal ratios

How can I obtain a non-trivial solution of the following: $$\frac{a}{b+c}=\frac{b}{c+a}=\frac{c}{a+b}$$ The answer is $a=b=c=1$.
207 views

### Avoid creation of OwnValues when inserting transformation rules into ExperimentalOptimizeExpression

I have a large list of transformation rules that I want to simplify. I find ExperimentalOptimizeExpression works as it gets me the answers. My question is: I ...
62 views

### How to extract data from a plot? [duplicate]

Here is the equation I want to plot, ...
95 views

### Evaluating standard functions of general quaternions symbolically

Mathematica can easily compute exponentials and logarithms of concrete quaternions: ...
250 views

### Does a running evaluation continue after the PC wakes from sleep mode?

Are there any issues with running a process on Mathematica, putting the computer to sleep, and then waking the computer sometime later? It seems to work just fine on my test process (appending data ...
179 views

### Issue with Mouseover within Geographics

When using Graphics, I can change the color of the object with the use of Mouseover. ...
58 views

### Is there any metadata-holding mechanisms in Mathematica programming similar to Java annotations?

I'm re-implementing some tools previously implemented in Java in Wolfram Language. Is there any metadata-holding mechanisms in Mathematica programming similar to Java annotations?
171 views

### Space around indices in Mathematica 10

When i write something like f(x_0) in traditional form mm puts white space around the index, so that especially the distance to the end parenthesis looks weird. In mm 9 I could reduce the issue by ...
94 views

### Matrix consisting of the matrices [duplicate]

I need Dirac Matrix in my work. They consists of PauliMatrix and ZeroMatrix, which is: ZeroMatrix:=IdentityMatrix[2]-IdentityMatrix[2] I define Dirac Matrix as: ...
109 views

### How to explain the behavior of Rule inside these functions [duplicate]

I'm trying to define a function that takes an expression and spits out a pure function involving a replacement rule of that function's variable. An example would be a function ...
386 views

### How to make a stereogram in Mathematica? (2)

Given a tiled background and a depth map, both of the same dimension, I tried to produce a stereogram using the following codes which was adopted from the method given by Simon Woods, but in a ...
1k views

### Is this 30% slowdown in Mathematica 10 due to DownValues lookup time?

Running several numerical self-programmed packages I realized already some time ago that Mathematica 10 needed between 20 and 40% more time. I did already report this of course with a simple example ...
211 views

### Dynamically transform one Graphics to another

I would like to have two Graphics objects displayed side by side such that: they are mirror images of each other if I change the left-hand one interactively using ...
2k views

### How to make a depth map from a 3D model?

Given a 3D .obj model, for example a rabbit. How can we make a depth map out of it? Any idea or help would be much appreciated.
94 views

### Edit built in symbol

I would like to add new attributes to built in symbols (e.g. ElementData or PolyhedraData) so that I can still call the symbol ...
166 views

### Generate a dynamic interface with sliders out of a list of rules

I would like to generate a function which takes a list of rules as input and generates sliders which are altering the values of the list. Then I would like to use this function in an dynamic module as ...
763 views

### Export dataset to JSON including Unicode Characters

I'm experiencing a weird issue. Consider a dataset defined like this: dataset = Dataset[{<|"a" -> 1, "b" -> 2|>, <|"a" -> 3, "b" -> 4|>}]; ...
283 views

### Median of Dataset in Mathematica 10

Bug introduced in 10.0 and fixed in 10.3 I'm having trouble calculating the median of a Dataset[] in Mathematica 10. The situation is as follows. Consider a ...
I get the error "The function Te appears with no arguments." when running this code. I'm not sure why. Is it because of the $Abs[\Gamma]$ ? ...