# All Questions

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### How to set image DPI?

For publications usually images in TIFF format are required in high resolutions. Where can I change settings for images that are being saved (using RMB click "Save Graphic As..."), so I don't need to ...
33 views

### What is wrong with this Cobweb plot

Something is wrong with my cobweb plot code but I couldn't figure out where do the mistakes come from. So basically we have the iterative map $x_n == x_{n-1}^{2} - 3 \mu$. I would like to draw a ...
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### If I have 4 kernels, why cannot I perform computations in parallel? [closed]

As Mathematica is quite slow, I want to run some computations, and until they are done I would like to work on something else. It is said that my version of Mathematica has 4 kernels. So why when ...
34 views

### How can I connect to a SQLServer database without login details?

I create a New Database in MS SQLServer 2012, specifically I didn't mention any Login details. I created tables in that DB. Now I want to connect with Mathematica. For that purpose I wrote the ...
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### Where can I find description of errors and warnings?

I am trying to solve numerically quite simple equation using NSolve[]. NSolve writes a warning: ...
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### Why mathematica returns list of rules instead of values in NSolve. Why outputs from different functions are inconsistient (NSolve/FindRoot) [duplicate]

Functions like NSolve return list of rules instead solution values. I have two questions: 1) how to change such list to list of values, for example ...
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### How to assign values to a function at discrete points? [duplicate]

Suppose we are interested in a function f[x] that is defined only at discrete points: x = {1.1, 2.1, 3.1, 4.1, 5.1} We want to ...
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### Different behaviours of Default Argument

I don't really understand the behaviour of Default Argument. If I execute this command in Mathematica: In: {f[a], f[a + b]} /. f[x_ + y_.] -> p[x, y] ...
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### CUDAQ[] returns False in version 9 while true in version 8

CUDA works in version 8 but not in version 9. Is there a way to fix the problem in version 9? I've installed the latest CUDA from the official website https://developer.nvidia.com/cuda-downloads
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I have a question about InputAutoReplacements. ...
116 views

### Sharp background image in plot

How do I get rid of blurry transitions between pixels of the background image below. It's the fault of Texture[], previously discussed in this answer. I haven't ...
44 views

### Problem with extracting specific contour from a ContourPlot

I am trying to exctract contours of specific value (2.6*10^-6) out of a ContourPlot and measure their area. Below you can see the code. It is noticable that not all of the relevant contours showed in ...
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### At what point should MLSetMessageHandler() be called?

I have an Installable MathLink program written in C. I would like to use a custom message handler. At which point in the C source code should I call ...
87 views

### Why don't these styling rules work when viewed in TableForm?

m = RandomInteger[{-5, 5}, {10, 10}]; m /. {x__, y_ /; y > 0} -> Style[{x, y}, Red] % // TableForm When m without style ...
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### Recursion depth exceeded

Below is my code for numerical solving of PDE with Crank Nicolson scheme. ...
52 views

### How to get a solution set of a nonlinear system of equations?

I'm trying to find the solution set of {x, y} variables for the following system of equations: ...
70 views

### Cannot solve system of linear equation sums?

I cannot get mathematica to solve: The problematic code: ...
61 views

### Resampling when using image as Texture

How to get sharp pixel boundaries with Texture? I'd like to have only black/white in the example below, no gray. ...
28 views

### Import/Export Cluster Object [duplicate]

I want to export and then import back in a cluster object from Agglomerate. After the import, the imported object does not behave as a cluster - for example, ClusterSplit does not recognize it as a ...
98 views

### Using single replacement rule to convert algebraic expression

I have been trying this problems for hours and cannot find any helpful clues. How can I convert $Sinh[3\theta]+Sinh[\theta]$ to a rational function of x given $2Sinh[\theta] = x-x^{-1}$ by using only ...
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### Beginner's question: Gap between FrameLabel and BarChart

I have a BarChart (Mathematica 9.0.1) ...
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### vectorized operations is not efficient?

Consider the following example: ...
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### How to create internally optimized expression for computing with high WorkingPrecision?

I have large dataset and need to fit rather complicated function on it with different values of one of its parameters (this parameter must be fixed in every fit). I use the ...
70 views

### Generating a list of all factorizations

What is the best way to generate a list of all factorizations of some number $n$? I'm quite new to Mathematica so this might be obvious. I have been trying some basic stuff with ...
86 views

### Why do these two different zetas produce the same value?

Zeta[-13] == Zeta[-1] == -1/12 Why do these two different zetas produce the same value?
113 views

### Solve this equation symbolically

I am trying to solve the equation for the quantity r = y/x symbolically: 3/y^4 == 3/x^4 + a/(x + 2 y)^4 with the requirement that we need to perform the ...
33 views

### How could I find the correct values for every array that would lead me to unique summation number for every unique chain? [migrated]

I have 9 arrays, each array has 9 values, I need to get the proper values in every value's position for every array, and that would give my a completely unique summations for every value's chain from ...
71 views