# All Questions

0answers
194 views

### Can I get access to Amazon's AWS API within Mathematica?

Has anyone tried access Amazon AWS API from Mathematica, I'm assuming the HTTP WebService module of Mathematica would be a starting point. Any suggestions on getting started would be welcome.
0answers
148 views

### Quantity and Trig functions

I have a bunch of data to which I've assigned units using Quantity, including some angular measurements in degrees. I'd like to be able to use these measurements ...
1answer
109 views

### ReplacePart inside For loop

I am trying to replace the last column of the following expression (mat) by doing ...
1answer
592 views

### FeynCalc “May shadow or be shadowed by other definitions”

So I've downloaded the latest FeynCalc from this site and put the extracted folder in user/me/library/Mathematica/application, but when I write the command ...
1answer
315 views

### How do I use FinancialData to obtain company revenue and income?

I'd like to make a plot of a company's revenue and income over time. I can do this via Wolfram Alpha pretty easily, just by searching "Ford revenue and earnings from 2000 to 2012". As such I can, if ...
1answer
270 views

### How can I extract the points from a ListSurfacePlot3D?

How can I get numerical output of ListSurfacePlot3D, i.e., a list of all the points, $(x,y,z)$ , used to construct the plot? Thanks to your help I now have a list of (x,y,z). But the new mesh is ...
0answers
73 views

### List of supported units in Mathematica 9 [duplicate]

Is there a list of supported units in Mathematica 9 documentation? I personal haven't found any; even the physical constants (newly supported as units in 9) can only be found in compatibility ...
0answers
164 views

### Defining and Solving Systems of Equations Using Matrix Tables

I've defined a system of equations, but I been unable to get Mathematica to solve for the individual variables created by matrix tables. ...
1answer
129 views

### Change position of mesh

I'm trying to plot a 3D graphic and I want to highlight the intersection between two graphics: a plane and a surface. I thought that Meshfunction->{#3&} was ...
1answer
255 views

### Plot a graph in a plane

I have a 3D graphics and i must plot a trajectory on a costant plane but i don't understand how to do this. With a simple Show[] command i can't do this. This is the code to plot the graphics: ...
1answer
135 views

### Plot several lines with different starting points on the x-axis

First of all, I would like to apologize in advance if I don't use the correct terms or if I express myself unclear but I just started to work with Mathematica. I'm simulating electricity prices and ...
1answer
663 views

### What technical obstacles prevent all Mathematica code compiling to C

The following represents an attempt at a very simple view of the levels in Mathematica code: We have had lots of questions about deployment and compiling Mathematica code to C. Some of these for ...
2answers
146 views

### Interactively Manipulate Code

Bear with me, I'm a noob; I simply want to create a radio button bar that selects whether I want to add or subtract two numbers: ...
1answer
531 views

### How to find an asymptote of a logarithmic curve

An exponential decay curve has been plotted asymptoting at approximately x=30 (correct for what I am looking at) How can I find the exact value from the curve? I was hoping to be able to use ...
2answers
1k views

### Using FindRoot with an interpolating function

This question bears resemblance to a few other questions on mathematica.SE about finding points of intersection of crossing curves. I know that the guidebook of numerics has an entry about the whole ...
7answers
1k views

### Find continuous sequences inside a list

I have a list which is something like this: {3,4,5,6,7,10,11,12,15,16,17,19,20,21,22,23,24,42,43,44,45,46} What I'd like to to is get the intervals which are in ...
1answer
240 views

### How can I fix Mathematica's text line-breaking algorithm not to line-break so soon?

I have some custom plotting functions that simplify the placement of footnotes and source notes under the plot. It is important that the line length of the footnotes fills up the available space and ...
3answers
525 views

### Rotate a grid, made up of lines, so that it aligns with the xy axes

While working on an answer for another problem I hit upon one of my own. I took the image given in that question and cleaned it up so that I could detect the grid lines: ...
1answer
1k views

### Optimizing a Numerical Laplace Equation Solver

Laplace's Equation is an equation on a scalar in which, given the value of the scalar on the boundaries (the boundary conditions), one can determine the value of the scalar at any point in the region ...
1answer
187 views

### How to restrict ListContourPlot with two criteria?

I use ListContourPlot to show exclusions in a physical parameter space. I have restrictions like A < 5 and ...
1answer
111 views

### Simple Question: Derivative of a path

I have a path V[t_]:={3t^2,2,6t}, and I define F[t_]:=V[t]/Norm[V[t]]. I simply want the derivative of ...
1answer
205 views

Based on this differential equation system: \begin{align*} \dot{x}&=f(x,y)\\ \dot{y}&=g(x,y) \end{align*} where \begin{align*} f(x, y)&=x^2+y^2-25\\ g(x, y)&=x^2-y^2-7 ... 1answer 91 views ### Using Manipulate Feature for Two ODE's So I have not been able to find any examples of the Manipulate feature for two ODE's. I would like to plot a graph of x[t] vs. y[t] and manipulate the initial conditions, v and theta. Thank you very ... 1answer 964 views ### Laurent series expansion Can someone share how to find a Laurent series expansion off(z)=\frac{1}{(z^2-1)(z^2-4)}$$centered at zero on the annular disk 1<|z|<2? 1answer 650 views ### How to find the global maximum of a function? [closed] I tried the following but plotting the function clearly reveals that there is a global maximum around r = 7 (here a = 0.53) ... 0answers 23 views ### Creating Plot with varying scale [duplicate] I have four series of data that I would like to plot side by side. They look something like this: As the y-coordinate goes from 80 to 50 In the first series, the x-coordinate varies from around 20 ... 1answer 655 views ### Plot FindRoot for non-trivial function I would like to plot the results of FindRoot over certain range of inputs. I tried to do this with the code: ... 1answer 221 views ### Plotting Piecewise function, ExclusionsStyle not shown completely Suppose I define f[x] := Piecewise[{{1.7*10^-6, 150 <= x <= 200}}, 0] and then plot ... 2answers 2k views ### How do I evaluate a double or triple integral over a region? Say I need to evaluate the integral \iiint_W f(x,y,z) dx dy dz and W is a region given to me like W = \{ (x,y,z) : 1 \leq x^2 + y^2 \leq 4, 1 \leq z \leq 5\}. I don't how to do this with a ... 3answers 1k views ### How to detect crosses and circles in 60x60 raster images? I have hand-written 60 pixel times 60 pixel squares. I need to detect whether they are empty, x or circle. TextRecognize function fails. Is there some other function to process this kind of raster ... 1answer 145 views ### Combinations which do not have elements in common I can choose 2 letters from the four letters \{A,B,C,D\} in 6 combinations using the combination formula$$\frac{n!}{ r! (n-r)!}$$... 1answer 118 views ### Trying to show an expression is always zero I have a symbolic matrix$$m = \begin{pmatrix}A1 & B1 & C1\\A2 & B2 & C2 \\ A3 & B3 & C3\end{pmatrix}$$and I believe that Det[m] is ... 3answers 261 views ### Dynamically filling matrix with a[[n,m]] = 1/a[[m,n]] I'm building a square matrix, with 1s on the diagonal and elements in U the inverse of elements in L, which are random integers drawn from the sequence 1, ..., 9. Given the nature of the problem I ... 2answers 771 views ### How can I draw a 3D cross-section of a 3-torus embedded in 4D Euclidean space? I have a 3-torus (\mathbf S^1\times\mathbf S^1\times \mathbf S^1) embedded in 4D Euclidean space. How can I draw the cross-section of this 3-torus cut by a 3D Euclidean space in an arbitrary ... 1answer 78 views ### Can I place a link to a package file (.m) in my Applications folder I am developing a package and would like to be able to test it without having to copy the package file to my UserBaseDirectory/Applications folder for each change, ... 1answer 91 views ### PaddedForm adds an additional padding character I would like to get a sequence from "01" to "10". I tried ... 0answers 225 views ### Determining if a point is inside or outside a 3DS (.3ds) or 3DS MAX (.max) object? Imagine I import some 3DS (i.e. 3D studio) file (http://reference.wolfram.com/mathematica/ref/format/3DS.html) or a 3DS MAX file. How could I place this model (say, the 747.3ds file in the ... 3answers 433 views ### How can write a list as a formatted string to a file I have two lists: {a, 1, b} and {b, 1.3, y} My goal is to print them to file test.dat, so ... 2answers 148 views ### Images as labels of barChart I'm trying to create a BarChart on which images are the labels of each bar. A Minimal example of what I'm trying to do: ... 3answers 254 views ### How do I avoid scoping collisions of iterator variables? Yesterday I had an issue that kept for quite a while. My code wasn't producing the right results. Now I know why and I am wondering how to avoid the issue in future. Consider the following code. ... 1answer 94 views ### How could I find the singular solutions of an ODE? Starting with the equation$$y^{\prime\prime}x^2={y^\prime}^2$$I could only get the general solution using DSolve: ... 2answers 240 views ### How can you combine lines in LATEX, and lines Mathematica? supose that You want to make a report about the golden section algorithm, and you want to explain the proccess with text in LATEX, and in every iteration you want to show in that report the values ... 4answers 801 views ### How can I format a table to look nice? I have this code, but i would like to see the results well formated, How can I obtain a well formatted data with aligment?, similar to this one insted what i obatin, you can see here Here is ... 1answer 70 views ### Question about rendering axes [duplicate] I have data points for a circle and would like to plot it with Mathematica. ... 2answers 2k views ### Solving a system of ODEs with the Runge-Kutta method I´m trying to solve a system of ODEs using a fourth-order Runge-Kutta method. I have to recreate certain results to obtain my degree. But I'm a beginner at Mathematica programming and with the ... 2answers 383 views ### Mapping higher dimensions to color, opacity, point size, etc I have a set of points of dimension >3, and I'd like to modify ListPointPlot3D so that the higher dimensions are mapped to different variables, such as color, opacity, point size, etc. so for example ... 1answer 88 views ### Why doesn't my line match my barchart? I'm trying to create a chart that has both a line and a bar chart representation of an expression. Because I'm using the same expression twice, I expect the line and the bar chart to match, but they ... 0answers 227 views ### Is it possible to marginalize one or several parameters obtained from fitting procedure? Statistical model analysis package has a few fitting functions. Their arguments are data points, fitting model and parameters in the fit. The result is a set of best values for parameters, which ... 2answers 365 views ### Combining Two Plots to Create a Zoomed Callout I want to combine two images to create a zoomed callout, as illustrated below. The plot on the right is the zoomed in version of the boxed area on the left. The dotted lines connect the ... 3answers 356 views ### Solving a system of equations with conditions related to the number of solutions The equation below describes a conic with oblique axis:$$9 + 22 x + 9 x^2 + 46 y + 24 x y + 16 y^2=0 It is a parabola, as the coefficients in $x^2$, $y^2$, $xy$ form a perfect square. To find the ...

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