Mathematica

Mathematica

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## How Do I Use Indexed with NIntegrate in Mathematica?

I'm having trouble using Indexed[] with NIntegrate[] in Mathematica. I want to evaluate something like NIntegrate[Indexed[t, 1], {Indexed[t, 1], 0, 1}] with a lot more variables (indices). ...

## wrong value from atan2 function in excel

I am trying to calculate the angle between two latitudes and longitudes but I am getting wrong result of atan2(X,Y) when used on Excel. β = atan2(X,Y) = atan2(0.05967668696, -0.00681261948) It ...

## Why MATLAB is slow in this case compared to Mathematica

I have this code in Mathematica: n = 5; k1[x_, t_] := t^2; k[m_, n_] := (1/(m!*n!)*D[k1[x, t], {t, n}, {x, m}]) /. {x -> 0, t -> 0}; kmn = Table[k[i, j], {i, 0, n}, {j, 0, n}]; kmn // ...

## Equivalent MATLAB code from the Mathematica code

I have the following in Mathematica n=5; Xt = Table[t^i, {i, 0, n}] The Mathematica outputs the following: {1, t, t^2, t^3, t^4, t^5} I want the equivalent MATLAB code. Please note the symbolic ...

1 answers | Aug 1 at 20:26 by NoMan on stackoverflow.com

## Mathematica: adding a list of lists elementwise

I have a list of lists of numbers. I add them into one list by adding all of the first elements together, all of the second elements together, etc. For example, if my list were { {1,2,3}, {1,2,3}, ...

## plot not showing legend when used in Miktex

A have density plot in Mathematica as ShowLegend[ DensityPlot[Sin[x y], {x, 0, \[Pi]}, {y, 0, \[Pi]}, Mesh -> False, PlotPoints -> 30], {ColorData["LakeColors"][1 - #1] &, 10, " 1", ...

1 answers | Aug 1 at 8:21 by zenith on tex.stackexchange.com

## How to work with DESLib in Wolfram SystemModeler 4.1

As a newbie in System Modeler 4.1 I am interested in queuing systems and found the DESLib, especially the ArenaLib. Unfortunately DESLib 1.7 seems not to work within this environment (version ...

## Trouble in proving that $\|x\|_p = \max|x_j|$

We define p-norm in this way: $\|x\|_p = \{\sum ^N_j=_1|x_j|^p\}^ {1\over p}$ We know that It change to $\|x\|_p = \max|x_j|$ when $p \to \infty$ How can I prove this ?

## Colour ListPointPlot3D points by index in Mathematica

Is it possible to colour points based on list index value? E.g. suppose I have a set of coordinates l1 := {{20.729858261394142, -11.014787072072988, 20.910738872021085}, {26.754953134772755, ...

2 answers | Jul 29 at 17:34 by pbs on stackoverflow.com

## Range gives me something else in place of 0, why?

I wanted to put some FrameTicks to a Plot with xticks = Range[-2, 2, 0.2] and got {-2., -1.8, -1.6, -1.4, -1.2, -1., -0.8, -0.6, -0.4, -0.2, 1.11022*10^-16, 0.2, 0.4, 0.6, 0.8, 1., 1.2, 1.4, 1.6, ...

## Mathematica Manipulate[] slider initial position

the initial position of a slider when using the Manipulate[] command is always the left side. Is there an option to set a different position at which the slider is positioned when the notebook is ...

2 answers | Jul 28 at 17:41 by Eli Duenisch on stackoverflow.com

## Paste Mathematica code so that's it's broken into separate input cells

I often copy Mathematica code from websites (such as SO) to a notebook. The code usually gets pasted as a single input cell. I'm looking for a simple way to paste it as several input cells for ...

## fixed point iteration to find out second order non-linear diff equations

I am working on some model analysis, getting two diff equations and after I convert them into matrix form, I have equations looks like $$[A][X]=C\times\big(\exp([B][X])-1\big),$$ where $C$ is a ...

## How to change the contours and legend in mathematica contour plot?

The ContourPlot function in Mathematica automatically gets you a legend and contours with colors on the plot which are uniformly distributed ( for example, blue color from 0.1 to 0.2 function values, ...

1 answers | Jul 27 at 21:10 by Maria on stackoverflow.com

## Mathematica: ListPlot with only special points lableld & PointSize

I tried now a couple of hours to get a 2D Listplot of the following kind. A ListPlot data of points should have a "3rd coordinate" like time (years) running with them. This works so far, but is just ...

1 answers | Jul 27 at 14:07 by edwin bubble on stackoverflow.com

## Minimizing NExpectation for a custom distribution in Mathematica

This relates to an earlier question from back in June: Calculating expectation for a custom distribution in Mathematica I have a custom mixed distribution defined using a second custom distribution ...

## pair multiple y-value lists with a single x-value list

I've got multiple lists, which each correspond to the chemical concentration of some species over 49 time-steps of some simulated chemical reaction. I also have a list of system temperature values at ...

1 answers | Jul 26 at 0:57 by Tucker on stackoverflow.com

## Trying to install Wolfram Mathematica on Jessie

I recently upgraded from wheezy to jessie. During the installation Mathematica was removed. Trying to reinstall it via sudo apt-get install wolfram-engine produces the error The following packages ...

## How to make labels for a 2-D figure with Mathematica

Goal: obtain the figure format like this one, Figure C in Fig.5.enter link description here Assume: we draw Sin[x] with the range from 0 to 2Pi. Plot[Sin[2 x], {x, 0, 2 Pi}, AxesLabel -> ...

1 answers | Jul 23 at 16:02 by ycagelulu on stackoverflow.com

## Is this system of inequalities (and equality) tractable?

I have some real parameters here. The $\mu_i$ - for $i=1,2,3,4,5$ - are 'convex coefficents' in that $\mu_i\geq 0$ and $\sum_{i}\mu_i=1$. The $x$ and $z$ are such that $x^2+z^2\leq 1$. The ...

## Frequency of a wavelet filter

Assume that I have decomposed a data set using Symlet Wavelet with six levels. How can I estimate the approximate frequency interval of each level? That would be great if you consider your answer in ...

1 answers | Jul 21 at 8:43 by K-1 on stats.stackexchange.com

## Solving a differential equation in Mathematica

I have a syntax problem solving a differential equation in Mathematica (10th version). The input for the equation I need to solve is as follows: solv = DSolve[{ a*u''[y] - b*u[y] == d, u'[0] == 0, ...

## How do I find many maximums in a list in Mathematica

I have some data that i'm trying to analyze and it has many cycles where it returns to a maximum value. I want to be able to select and pull out all of those maximum values and make a trend line to ...

## In Mathematica/Wolfram language, is there any way to check that an expression evaluated?

If I have a function: Foo[x_] := If[x==2, Print@"Two", Print@"No"] Then if I write the following: Foo[oops]; Foo[5] Where oops is a misspelled name for a global variable, the result is that the ...

1 answers | Jul 20 at 14:43 by Mark Green on stackoverflow.com

## Avoid & Count non-numerical values computing basic statistics in Mathematica

Please consider: dalist={{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, {2.88, 2.04, 4.64,0.56, 4.92, 2.06, 3.46, 2.68, 2.72`,0.820}, {"Laura1", "Laura1", "Laura1", "Laura1", "Laura1", ...

## Using DSolve for a real part of a differential equation (Mathematica)

I try to solve a differential equation (using DSolve) of the form: Sys = {(Re[a T'[x] + b T[x]] == 0), T[1] == 3}; Sol = DSolve[Sys, T[x], x]; Plot[T[x]/.Sol, {x, 0, 1} Where 'a' and 'b' are ...

## extracting text from specific tags in html using Mathematica

For a page with html like this structure: <tr class=""> <td class="number">1</td> <td class="name"><a href="..." >Jack ...

## Convergence of a hypergeometric function

The hypergeometric function, ${}_{2}F_1(a,b,c;z)$ can be written in terms of a power series in $z$ as follows, {}_{2}F_1(a,b,c;z) = \sum_{n=0}^{\infty} \frac{(a)_n (b)_n}{(c)_n} ...