# All Questions

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### Output cell written with NotebookWrite dissappears on whole notebook evaluation, yet remains if I individually evaluate it

Create a new notebook with the following two input cells: NotebookWrite[EvaluationNotebook[], Cell[BoxData[ToBoxes[Manipulator[Dynamic[x]]]], "Output"]] and ...
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I've just learned Mathematica can send e-mails using external servers: this is great... ! Now, using this link, I've set this up using my Gmail account. But is it possible to incorporate somewhere my ...
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### Simplify expression after substitution

I tried to substitue variable x of one equation with another variable z (z=nx/(nx+m)). See as follow: ...
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### How do I project a list of strings from another list to use in ChartLabels? [duplicate]

Say I have the following: ...
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After calling some functions, if I look into $ContextPath, I can see that JLink` is in there. Is there a way to find out what ... 4answers 2k views ### How to get intersection values from a parametric graph? I have this graphed: ParametricPlot[{2.4*Cos[t] + 1.6*Cos[3 t/2], 2.4*Sin[t] - 1.6 Sin[3 t/2]}, {t, 0, 4*Pi}] It is a star, and the lines cross each other ... 1answer 163 views ### FullSimplify yielding different results in mathematica 8 and 9 I have been experiencing some problems running a certain mathematica file in version 9. I've tracked the problem to a particular sum that I perform. Running the same code in version 8 and 9 I get two ... 4answers 166 views ### Make which controls are visible in a Manipulate depend on a control value I want to make a simple demonstration using Manipulate in which I have one or two input fields show depending on whether or not another control is True or False. How can I achieve such functionality? ... 1answer 180 views ### Using functions to make loops I'm trying to make a simulation of an electron that goes through a magnetic and electric field perpendicular to each other and to the velocity of the electron but I'm running in some troubles with the ... 2answers 316 views ### Recursive Integral for Volume of$n$-Ball The volume of an$n$-ball (the$(n+1)$-dimensional analogue of a disk) of radius$r$can be found by the following integral recurrence: $$V_0(r)=2r$$ ... 4answers 387 views ### How to bend a logarithmic number line into a circle One way to plot a sequence of numbers on a logarithmic number line is this: ... 2answers 257 views ### Heron's formula for area of a triangle [closed] Use the first form of Heron's formula to give a function areah, which gives the area of a triangle. Test your answer on the isosceles triangle ... 3answers 221 views ### Why does Integrate set the constant of integration to be one in this case? Why does Integrate[(4 x)/(2 x + 1), x] give 1 + 2 x - Log[1 + 2 x] Notice the extra ... 1answer 151 views ### How can I get the beautiful font used in the Demonstrations web site in my notebook? [closed] This question may be off-topic (if it is, I will delete it), but: What is the name of that beautiful monospace font used in the Wolfram Demonstrations source code snippets ? 2answers 301 views ### Optimum number of cog teeth for two step helical gearbox Note: Cross-posted at http://community.wolfram.com/groups/-/m/t/137895?p_p_auth=8QnKtT9I. I am to design a two step gearbox. The first step is to choose the number of teeth in each cog wheel in ... 1answer 79 views ### An equivalent in Mathematica [duplicate] Let's say I have a$n$x$m$matrix$M$in Matlab and I want to substitute the elements of$M$that exceed$15$for$-1. In Matlab I just write M(M>15)=-1 and ... 1answer 187 views ### How can I stack plots so that they are aligned nicely? [duplicate] Suppose that I have two plots (e.g., Plot, ListPlot, etc) that cover two regions of space. I would like to display them ... 2answers 169 views ### Total weight of a graph I need to find the total weight of an WeightedAdjacencyGraph. I have a graph in that form ... 2answers 202 views ### How to print prime numbers [closed] I want to know how can I print out a list of prime numbers. Should I use For, Do, If, ... 3answers 692 views ### How can I type-check the arguments of a Mathematica function? (For educational purposes) I defined the following functions: Translation (in\mathbb{R}^2$): trM[vec_] := {{1, 0, vec[[1]]}, {0, 1, vec[[2]]}, {0, 0, 1}} ... 2answers 132 views ### Problem with Select and Pick I want to filter a data file choosing those elements that match a condition and then plot them. Here is the corresponding code I use: ... 4answers 151 views ### Can I combine two FoldList into one? I want get something like this: {{x, x}, {g[x, 1], f[x, 1]}, {g[g[x, 1], 2], f[f[x, 1], 2]}, {g[g[g[x, 1], 2], 3], f[f[f[x, 1], 2], 3]}} one way is ... 1answer 106 views ### Two quick Mathematica Questions about the dictionary Question1: Get the list of pairs of the form {language,number of words in dictionary}. Call this list langlength What I did was this: ... 0answers 143 views ### NonlinearModelFit is not giving the fit with minimum chi^2 First of all, a bit of background, I am using Mathematica to fit angular distributions of gamma rays, so I apologize for some of the serious messiness in the formulas. The data is simple I have three ... 4answers 782 views ### Mathematica gives wrong result while Wolfram|Alpha is correct Why does Mathematica and Wolfram|Alpha give different results based upon the same code? I know Wolfram|Alpha's 7.85 is correct. 3answers 506 views ### How to use legends from PlotLegends in LevelScheme? I've been attempting to find efficient ways to generate graphics with legends for export, and have been working with both LevelScheme and the new (to v9) ... 0answers 111 views ### FeynRules Package Does any one use the FeynRules package? If so, how can I implement a vertex of one Gluon and two octet scalars? I tried ... 1answer 122 views ### Should I end all definitions from packages with semicolon? I noticed that if I open a .m file in Mathematica and click on the Run Package button, all the ... 1answer 170 views ### Judging the quality of fitting an EventData object to a distribution using LogRankTest I have$389$data points defined in an EventData object and want to judge the quality of fit of this data to a fitted$3$-parameter Weibull distribution. This ... 3answers 833 views ### Minimum spanning Tree from a weighted adjacency graph Note: Cross-posted at http://community.wolfram.com/groups/-/m/t/137658?p_p_auth=8QnKtT9I I have a really big graph, 40x40. Here is my code ... 0answers 100 views ### How do I incorporate metadata using Export? I have Export["file.png",codeThatMakesAGraphicsObject[],"PNG"]; and want to embed some specific metadata information. Is there a simple way to do that? Note ... 0answers 173 views ### Calling a DLL with two inputs and one output I need to call a DLL that requires two real number inputs to get one real output back. I can get one of the simple example uses of DefineDLLFunction to work, but I ... 2answers 278 views ### Placing text inside a region with RegionPlot I am plotting many regions with RegionPlot. I would like to label each region as I plot it so that I get something that looks like figure made with the following code: ... 3answers 641 views ### Insphere for Irregular Tetrahedron I am looking for existing Mathematica code to compute the unique sphere inscribed inside an irregular tetrahedron. I can write it myself, but I would love to find that someone already performed this ... 3answers 775 views ### Strip waste braces in nested list I have nested lists wherein there are a lot of waste levels which looks like l = {{{{{{2, 2}}, 3}, 2, {{2, 33}}, 4, 5}}}; I would like to reduce it to somthing ... 1answer 68 views ### Possible to include additional styles in context menu? I am using Mathematica 9 on Windows 8, and I regularly want to use cell styles such as Section, SubSection and so on. If I click the + button before creating a new ... 3answers 189 views ### Statistical analysis of a data file and its Plot [closed] As the title says, I have an external data file which contains thousands lines of data. The data file contains eight columns and here is what I would like to plot: Let's assume that the length of the ... 1answer 67 views ### Substitute complex functions into complicated polynomials Mathematica has some strange way of sorting terms. It seems that it is using a canonical sort on expressions, e.g.$\mathbb{i} \sin[x] \cos[y] \cos[z]$is returned as$\mathbb{i} \cos[y] \cos[z] ...
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I am trying to upload my CDF files to Blogspot. I tried the follow script: ...
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### Make Entire Area of New Graphic Editable

Create a new graphic via the menu bar: Graphics -> New Graphic. The FullForm expression for this graphic is: ...
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### How to enter a LaTeX integral?

How can I enter a LaTeX integral into Mathematica? For example, I evaluated the expression ToExpression["\int 2*x\[DifferentialD]x ", TeXForm] but Mathematica ...
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### Using free-form linguistic input in a dynamic input field

I've been playing around with dynamic input fields; here's a basic example, which just consists of an input field where the user can enter a function and then a button that can be clicked to graph the ...
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### LeastSquares with some parameters missing

I want to do a partial least squares (PLS) regression using LeastSquares on my data. The input parameters are temperature, humidity and pressure for a given date. ...
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### How to typeset a system of equations

Is it possible to typeset systems of equations in Mathematica, and if so, how can I do it using a big left bracket as one could in LaTeX with \left\{ ... \.? I ...
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### How to work with differentials explicitly?

When working with differential equations with independent (e.g. t )and dependent (e.g., x[t]) variables Mathematica expresses ...
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### Memory Leak while running Animate/Manipulate/Export [duplicate]

While looking into building a simulation for an ant colony, I started encountering some memory leakage issues. ...
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### When should I use Apply (or Function) and when @@ (or &)?

This is a rather general question, which I fail to answer myself. I guess it is mainly due to my insufficient knowledge of the precise terms. If I understand correctly, the following are equivalent: ...
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### Can Mathematica solve integro-differential equations?

I have integro-differential equations like this: ...
I would like to compute the integral $$q_n(x)=\int_{B}^A q_{n-1} (\omega)f(x-\omega)\mathrm{d} \omega,\quad q_1=f,\quad n\geq 1.$$ for a given density function $f$. Basically it is the convolution ...