# All Questions

2answers
543 views

### How to add a vertical line to a matrix?

Today, I want to write a program to show the solving process of a the inverse of a matrix, and I use the Elementary Transformation, so I need to add a vertical ...
3answers
131 views

### MapAt a function at specific positions

I'm trying to solve for $p3$ in 3p3-5 = p1 + p2 at positions where p1*p2 == 0: ...
2answers
633 views

### Modifying parameters: Set::setps in the part assignment is not a symbol [duplicate]

Ok, this will probably be a silly question, but I can't get my head around it. I'm making a simple module that, given a list and two integers, will swap the position of the elements in the list.(...
3answers
221 views

### Weird output of DistributionChart

I have a larger data set and want to display it using DistributionChart. ...
1answer
1k views

### NDSolve and Piecewise functions

I want to clarify upfront, This is not a please help me get the answer to my homework question. I know what I need to do I just do not know how to get mathematica to do it. I am working on an ...
1answer
206 views

### Visualization/colorization of many outliers in a BoxWhiskerChart

Imagine a larger data set which I want to display using BoxWhiskerChart. ...
1answer
186 views

### How can I load << MathWorldCurves?

I'd like to recreate in Wolfram Programming Cloud the plot in http://mathworld.wolfram.com/notebooks/SpaceCurves/Slinky.nb How can I load ...
2answers
256 views

### Plotting (Graphing) a Quadratic Function with Vertex and Roots

I'm new to Mathematica and I'm not really familiar to the Mathematica functions and the language. Could any of you help me plot a quadratic with the following characteristics: vertex at (1.5, 1.75) ...
0answers
191 views

### Derivatives of Convolutions with Integration by Parts and Delta Functions

I am not even certain how to approach this problem. f[x] is a pdf: positive definite, normalized, and approaching 0 at +/- Infinity p[x] is f[x] convolved to a normal dist of mean = 0, variance = v. ...
1answer
94 views

### How to plot multiple orbits with more than two functions

Using a program given to me (which was designed to have a particle orbiting another of infinite mass), I tried to extend it to the motion of two particles orbiting a common centre of mass. I have a ...
1answer
496 views

### Formatting ticks of axes to scientific format and modifying the labels [duplicate]

I was trying to plot a function, but had a problem with the tick labels staying close to each other (top plot). DiscretePlot[RmvsB[b], {b, bmin, bmax, bstep}] ...
1answer
354 views

### How to open *.sif files with Mathematica [duplicate]

While I am processing my data collect from an Andor EM-CCD, I find it diffcult to import the file into mathematica. I think mathematica can open this kind of files since that Matlab can open it. So if ...
1answer
407 views

### Indeterminate expression 0^0 encountered

I'm new in Wolfram Mathematica so the the question may seem quite simple. I define the following function ...
2answers
423 views

### Given a system of inequalities, how to make Solve find out that two variables should be equal?

Given two boolean variables x1 and x2 (in the sense that they are in the range [0,1]), if I try to solve the following equation system with Solve: ...
3answers
274 views

### Improving selection of elements from large multidimensional array

Frequently in my profession I deal with large arrays of data. Typically these are mixed types including integers, strings, dates, and reals. To recreate a typical data array: ...
4answers
411 views

### How to eliminate the white gaps in the graph

Here is my code ...
1answer
194 views

### What's wrong in FunctionPeriod?

FunctionPeriod[Sin[16 Pi x/5 - Pi/8], x, Integers] 80 then I ListPlot the function: <...
4answers
217 views

### Plotting recursive from a for loop

our assignment is that we have make a plot for the possition of 1's From the recursive function if a[n-1] is even then ...
1answer
293 views

### Compile nested Sums

I want to compile an expressions that contains nested Sum-expressions. A simple example that gives me problems is: ...
0answers
65 views

### Show actual Interpolation function [duplicate]

Is there a command to show the actual function when using the Interpolation command? For example, f = Interpolation[{1, 2, 3, 5, 8, 5}] returns ...
1answer
128 views

### How to plot a 2-D function of points which is a function of points from the Unit Circle

Consider the set of points $(x,y)$ such that $x^2+y^2=1$. Consider the functions $f(x,y)$ and $g(x,y)$ and I want to plot the set of 2-D points whose co-ordinates are $\left(f(x,y),g(x,y)\right)$. An ...
0answers
436 views

### A documented syntax of FileNames doesn't work?

Documentation discrepancy present through 10.3 According to the documentation for FileNames under Details: However when I attempt to use this syntax I get an ...
0answers
42 views

### Numerical Error with Matrix operations [duplicate]

A is a 3x3 matrix, b is a 3x1 vector. I try to convert [A|b], a 3x4 matrix, to [I|0]. So the formula is right multiple ...
1answer
460 views

### How can I read compressed .Z file automatically by Mathematica?

When I read .Z file by something like jpldatstring = Import["ftp://cddis.gsfc.nasa.gov/products/jpl/2003/jplg0040.04i.Z"] Unfortunately, it turned out that "...
1answer
132 views

### Rename a list of files [duplicate]

I need to rename a list of files .bmp having name like 1.bmp, 2.bmp,...,155.bmp. I want to get a list of files having the same number of digits in name like 001.bmp,002.bmp....,155.bmp. I am trying ...
0answers
64 views

### How to update Plot and some output inside NDSolve callback (StepMonitor)

I have the following problem. I am calling NDSolve to solve a system of first order differential equations (nothing fancy), except that the number of equations measures in thousands and the number ...
2answers
93 views

### Error using Nsolve with system of two equations: “Use Reduce”

Having some odd behavior with some mathematica code I am running. I am solving a simple system of two equations but mathematica gives an error and asks to use Reduce? I looked up in the manual but ...
1answer
127 views

### Manipulating parameters in a complex algorithm

I have a complex algorithm that depends on: A wavelet basis A number of sampling points out of a distribution A thresholding value I want to be able to play with different scenarios using ...
1answer
147 views

### Calculate the relationship between the duration of two oscillating functions

I am trying to quantitatively determine the relationship between the length of two oscillating functions. Meaning, what is the duration of the green spike in relation to the blue square? Does anyone ...
0answers
78 views

### How to select default graphics device for charting?

Is there a way to tell Mathematica to use a specific graphics device for charting? My laptop has two graphics devices; an on-board Intel chip and a Nvidia graphics card. I noticed in Mathematica's ...
0answers
355 views

### J/Link doesn't work with Java 8?

I have some code that successfully uses J/Link (well... until today when something I was doing something with it that crashed the JVM, so), and I recently tried running it under Java 8. I then get a ...
1answer
76 views

### How to Overwrite the DisplayFunction?

How to overwrite the display function of TemplateBox? For example, if I have: ...
1answer
120 views

### Casting Dataset internal type from Assoc to Struct

Using: planets = ExampleData[{"Dataset", "Planets"}]; The full form of this projection displays the internal type def: ...
3answers
438 views

### How to replace the first occurance in an expression instead of replacing all?

Is there a function that replaces the first occurance of the expression instead of replacing all? For example, if I have HoldForm[x + 2 + 4 + x] /. x -> 4, is ...
1answer
960 views

### How do I store values in a for loop into an array and then plot that array? [duplicate]

What my title said and I want to plot the values of the array. still new to mathematica and programming so its hard to formulate my question just right
7answers
1k views

### How to assign a list of numbers into letter grades

Here is my list: ...
0answers
64 views

### solving nonlinear equation [duplicate]

I typed this below code in mathematica 9.0 but wasn't solved: ...
3answers
919 views

### Finding the surface area of a 3D convex hull

I have noted several instances here and here where ConvexHullMesh, introduced in v10 has been used to greatly simplify some geometry problems. Determining the ...
0answers
27 views

### Coloring problem in plot3D with transparent texture [duplicate]

I need to plot multiple surfaces with textures. Each texture is a matrix plot with transparent background. In this way, we can see the multiple surfaces from the top. ...
2answers
248 views

### Another weird plotting result

I asked a question this morning here, which has been resolved. However, I got another problem. I want to add some lines to the graph, which turns out glitched. The code is as follows, ...
3answers
321 views

### Random Integer Sequences

I want to construct a random square matrix in the following manner: a) Three states [0 | 1 | 2] are repeated ...
1answer
109 views

### JordanDecomposition in Mathematica

I'm trying to find the Jordan Decomposition in Mathematica for  A=\left( \begin{matrix} 2& -5& 8&-12\\ 1& -2& 4&-8\\ 0&0&2&-5\\ 0&0&1&-2 \end{matrix} ...
1answer
164 views

### Unable to compile to C

I used to be able to compile to C without problems, but from one day to the next, when I try to compile something, e.g. ...
2answers
70 views

### parsing a list or vector

I have a table of elements that generate a list q[i_]=i; B=Table[q[i],{i,1,50}] I would like to parse the list meaning, take the first 10 elements, then take ...
2answers
112 views

### Make a partition with a rule [duplicate]

I wrote this line of code : {{1, 1, 1}, {1, 1}} /. ((x___ /; Length[x] > 2) -> Partition[x, 2, 1]) generates this error : Partition::pdep: Depth 1 ...
0answers
287 views

### Import displays DICOM images as black rectangles (Mma v. 10)

My problem concerns Mathematica version 10.0.1.0 with OS X 10.9.4, OS X 10.9.5 and it does not occur in Mathematica version 9.0.1.0 (on the same computer and OS). About 90% of my DICOM images are ...
3answers
475 views

### Combining many plots with Show produces wrong x-axis position and wrong filling

The code is as follows, ...
1answer
936 views

### Drawing an arrow or a solid dot on a curve?

I want to draw arrows and the solid dot like in this picture on a curve.
1answer
171 views

### Question about using NDSolve with a matrix equation

I tried to use NDSolve to study a matrix-valued differential backward equation. The following program seems to work: ...
1answer
534 views

### WSTP broken by upgrade to 10.0.1?

Bug introduced v10.0.1 and fixed in 10.0.2 Everything was working fine with WSTP (the successor to MathLink) in 10.0.0. But I upgraded to 10.0.1 today and now I can't compile either my programs (I'...

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