Mathematica

Mathematica

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## How can I plot error bars in Mathematica on a bar graph?

I'm working with Mathematica and I'm trying to plot a bar graph. I can plot just the bar graph, but I can't get the error bars to work. The only one I can manage to get to work is using ...

## mathematica physical constants without units

It is helpful to use physical constants included in mathematica. Unfortunately they all include units. This provides errors when trying to integrate numerically. Is there a way just to get the value …

## Sound Recording not working

I have a Dell Inspiron 1525 running Windows Vista. I intend to record a sound input on my PC using Mathematica 9. It's fairly simple with the command: SystemDialogInput["RecordSound"] Afterwards I …

## Latex vs Mathematica for typesetting?

I'm currently an undergraduate engineering student, and I am confused. I have a fairly decent (basic) knowledge of Latex for typesetting documents. I was wondering if anyone has used Mathematica for …

## How to set the step of plotting by one of axes in Wolfram Mathematica

I have a data such as list of points x,y,z. I added interpolation by splines as f = Interpolation[{#[[1 ;; 2]], #[[3]]} & /@ data, Method -> "Spline"] And after all I try to plot ...

14 hours ago

## Mathematica help ~ converting elements in a matrix to string

I have this 10x10 matrix (or Array) in Mathematica whose elements which have the value -1 or +1. I want to change all the -1 to a string " " (here its just the spacebar) and all the +1's to the symbol …

## issue with Set function

Tables often come with column headers. Indexing the columns with the header is a natural thing to do. Although a proper dictionary is the usual solution in such a case, I find it often practical and …

## How to create a function directly from the output of Solve

If I evaluate Solve[f[x,y]==0,x], I get a bunch of solutions like: {{x -> something g[y]}, {x -> something else}}, etc. Now I want to convert each of those x->somethings into a function. …

## How to set the default image resolution for exporting?

I know Export["image.png", image, ImageResolution -> 300]. But it there a way to set the default value for ImageResolution?

## ButterWorth Filter in JavaScript

I am working in JavaScript. I want apply butterworth filter for a data on online. I did the below code to filter. It Filters the data but Some problem. I need any algorithm to implement butterworth …

## Uzawa Algorithm with mixed constraints

I have difficulty resolving an exercise about Uzawa algorithm (with basic requirements: J is a quadratic function and a symmetric matrix A) gi =−1+ max(0, 0.625−10(ti −0.4)^2) with ti=ih Then we …

## Roots and Weights

I use a Mathematica package to compute roots and weights (and other things) but the package gives me only the expression of the roots in $\omega$-basis (basis of fundamental weights) and in the ...

## Create a graph using Mathematica and Python

I was wondering how I would go about using Python to create a Graph with Mathematica. I want to be able to use python code to invoke mathematica to create a new graph, using data from a CSV file.

Apr 16 at 13:00

## Why is a big loop within a small loop faster than a small loop within a big one?

This is my Perl code $big=10_000_000; #A:big loop outside my$begin_time = time; foreach my $i (1..$big) { foreach my $p (1..10){ } } my$end_time = time; my ...

Apr 16 at 12:29

## Wrong result of a recursive relation

I took this code from here on page 15. The code: s[i_] := s[i] = 2*s[i - 1] - 3*(s[i - 1])^2 s[0] = SetAccuracy[3/10, 20] Do[Print[s[i]], {i, 0, 40, 10}] Output: 3/10 0.33333333333333 0.3333333 …

Apr 16 at 12:16

## a width of interval on each step of iteration

Tell me please , is in Mathematica a standard function which can find a width of interval? I have to find it for each iteration. (*Newton's method*) step[f_, iter_, inter_] := Module[{x = …

## How do I export a higher resolution image of a Mathematica Graph object?

How do I export a re-sized version of the output I get from a call to GraphPlot (or TreePlot if they produce different output) to a jpg file? Currently, I'm simply calling Export[file_name, G] where …

Apr 15 at 14:32

## Find min of $\frac{\left( \sum kx_k \right) \left( \sum x^2_k \right)}{\left( \sum x_k \right)^3}$

With $n \ge 2$ and $x_1,\ x_2,\ \dots,\ x_n > 0$. Find the minimum of: $$M = \frac{(x_1 + 2 x_2 + ...+ nx_n)( x^2_1 + x^2_2 +...+x^2_n)} {\left( x_1 + x_2 +...+ x_n \right)^3}$$ For specific …

## the Newton's method in the mean of Interval

I have to write the Newton's method in the point which is the mean of Interval. and in 'While' loop it could be while the function(point)>eps. point = Mean[inter]; step[f_,inter_] := ...

## How does the base of a group determine the “sort” of the elements in the group

I'm trying to study groups in Mathematica, and I've asked a question on Mathematica.SE that perhaps only someone from Math.SE could answer. Related: How does GroupActionBase affect the order of ...

## Finding normal, tangent, and binomial of a Bezier function in Mathematica

I'm currently trying to find the normal, tangent, and binomial across an iso-surface. Here is the code I have to find them: graphT[curve_, t_] := ( varbez = BezierFunction[curve]; temp = varbez'; …

Apr 14 at 23:28

## procedure with iterations of the first step Newton's method IN POINT

I have to write the procedure with iterations of the first step Newton's method in Moore's form in Mathematica8, exactly on this example: GIVEN: f[x_]:=x*x-8*x+7; inter={5, 9}; eps = 10^(-6); TO ...

## What are the labels for minor ticks in a log scale graph?

What are the labels for the minor ticks in a log scale graph? I would like to label them. So, I want to know how to calculate the value for each of the minor tick.

Apr 14 at 15:00

## mathematica FullSimplify cowardly refusing fully evaluate real parts of a complex number?

I'm wondering if there is a different command than FullSimplify to tell mathematica to do the computation requested. Here's three variations of a simplification attempt FullSimplify[Re[ …

Apr 14 at 14:43

## Mathematica quits calculation automatically

I have this little program that is adopted from a Wolfram demonstrations project (link here: http://demonstrations.wolfram.com/PercolationOnASquareGrid/). I want to see what happen if I increase the …

Apr 12 at 18:51

## Mathematica logo in LaTeX?

Is there any command for inserting the Mathematica logo, in the same way Matlab's can be inserted with \Matlab?

Apr 12 at 15:31

## Save Plot Options of Mathematica into a single variable

How can I save the numerous Plot options in Mathematica into a single variable

Apr 11 at 12:31

## Converting octave matrix function in Mathematica

I'm trying to solve a problem: I need to translate an octave code in mathematica but I'm struggling with those lines. function g = NeumannBoundCond(f) [nrow,ncol] = size(f); g = f; g([1 nrow],[1 ...