All Questions

301 views

ParametricPlot3D line not smooth

Multivariate parameters appear to present a jagged appearance of integrands (using default Runge-Kutta ODE integration intervals?) in ParametricPlot3D plotting on a single argument. Higher Mesh.. ...
158 views

How to add “special” Ticks?

this is my code: ...
73 views

Can not understand the code to join points into line segments

I'm reading the CDF file from Making Formulas… for Everything in wolframalpha blog. It's hard for me to understand the In[17] code of function pointListToLines. I especially want to know what the use ...
222 views

Optimizing Chi-square distance between two distribution

I want to program the chi-square between two distribution Xu and Vu with length N. This function is defined as below: Xu and Vu are real and positive. ...
83 views

TrigExpand Idiosyncracies

TrigExpand[Sin[x]^2 Log[y]] returns sin^2(x) log(y), as one would expect. However, ...
156 views

How to get mathematica to show limit of a recurrence sequence?

I want to find the limit of a such a sequence: $f(n+1)=\sqrt{2f(n)-1}, \, f(0)=a, a>1$ How does one do this? Is it possible to have it show the solution algebraically, like it does with ...
74 views

Can Mathematica do this integral over $\mathbb{R}^n$?

I have the following function: $$\phi_{k,n,r}: \mathbb{R}^n \rightarrow \mathbb{R}, (x_1,…,x_n)\mapsto (1-r^{n-k}e^{\sum_{i<k}x_i})e^{\sum_{i<j}x_i-x_j}e^{(2-n)\sum_i x_i}$$. Is there any way ...
367 views

Multiple-colored regions on a Sphere in Mathematica

The problem: I would like to draw a sphere where the bottom half is one color, and the top half is split into 3 equal regions, each with its own color. I have come up with the following code, by ...
78 views

Changing MathKernel process priority on the startup

In the built-in Documentation there is an example how it is possible to change the priority of the MathKernel process using NetLink: ...
130 views

Evaluate function defined by DifferentialRoot

I have the following sequence of rationals that I want to find the generating function of: ...
242 views

How to exclude some indices in defining Table?

Suppose I define a table using Table[n, {n, -n0, n0}] (where n0 is some positive integer) but I want n not to take the value ...
133 views

BSpline or other curve through arbitrary ordered sequence of two-dimensional points

How does one create a BSplineCurve or other smooth curve passing through each point in an ordered list, where the curve may be non-simple, i.e., can double-back ...
94 views

How to show output of a matrix in m(1,1)=a11 m(1,2)=a12 …in this way…i have 50 *50 size matrix

How to show output of a matrix in m(1,1)=a11 m(1,2)=a12 ...in this way......i have 50 *50 size matrix so i want to do it efficiently. output to be shown like m(1,1)=a11 (in fortranForm) m(1,2)=a12 ...
92 views

Output of matrix in FortranForm

matr2 = Table[FortranForm[matr[[i, j]]], {i, 4}, {j, 6}] but i want output to be more like this matrix(1,1)=a11 output in ...
98 views

How restore printing of messages?

In the upper left hand corner of my message window, the button reads "Delete all messages". I don't get any messages at all. How can I get messages restored.
238 views

Compare 2 lists

I want to compare 2 lists. One is very large and I need to compare many times. Lets say Length[list1] I need to know how many times list1 occures in list2. Eg. list1={1, 0}, list2={1, 0, 1, 0, 1, 1} ...
94 views

Lists of integers coprime to another list

I have two lists of integers. The first, p, is a list of primes (for example, {2,3,5,7}). The second is a list ...
143 views

Why does adding 6.1 seconds display as having added 6.099?

Why does adding 6.1000000 seconds to a DateObject display as having added 6.099? If I copy the Out[20] element from this picture, it contains the correct value: ...
142 views

ParallelTable kernels die - maybe Mathlink timeout?

I am new to parallel computing in Mathematica. I am using LaunchKernels[16] ParallelTable[] to parallelize calculations. The ParallelTable consists of approx ...
84 views

citation insertion from bibtex file does not seem to work

When I try to insert a citation in a text cell using the right click citation/insert bibliographic reference, and then choose the Bibtex option, I get the complaining window shown. This happens no ...
227 views

Selection bugs make Mathematica 10 unusable

I'm getting odd selection bugs in Mathematica (10.0.1.0, OS X 10.10) that are making it impossible to use. For example if I simply click before the 'i' in With I ...
86 views

How to define a function that is related to derivative of Jacobi theta function

I would like to make 3D plot of the following function. ...
119 views

RegionFunction generalized to plot a different colour/style for the largest expression [duplicate]

I have several functions of two variables defined in some region, say functions[x_,y_]:={0,x-y,Sin[x^2-y]} I'd like a plot to show at a glance the regions where ...
223 views

DSolve echoes input

I'm attempting to solve a set of coupled, non-linear ordinary differential equations using DSolve, but Mathematica simply echoes the code that I put in: ...
131 views

webMathematica - MathLink linkname missing or malformed

I just installed webMathematica on Linux Debian + Tomcat7 + Mathematica 9.0. I'm getting this error web testing any example. HTTP 403 - MathLink linkname missing or malformed. The error is also ...
114 views

Combination of interpolations doesn't work?

I have tables of function values f[i_] and g[i_] and I need to plot various combinations of the function and its derivatives ...
798 views

Mathematica 10 cannot solve definite integral [duplicate]

Bug introduced in 10.0 and fixed in 10.0.2 Mathematica 10 fails to solve the following integral, saying that it does not converge. ...
137 views

Matrix multiplication

I want to multiply 1000by1000 matrices but MMA runs out of RAM. ...
572 views

draw part of parabola using graphics

today I was doing my physics homework. one of the questions was draw velocity-time and position-time graphs from the acceleration-time graph. So for the first step I draw acceleration-time using ...
96 views

Slowdown of Flat attributed function

I was trying to write an associative function f using the attribute Flat. ...
123 views

121 views

Eliminate symbols from Lists

I'm working with a list of roots of a 3rd order polynomial family, so i get a list this way: ...
117 views

Producing a minimal Gröbner base

Mathematica has the command GroebnerBasis[{p_1,...},{x_1,...}] that returns a Gröbner base for some set of polynomials. I want to know if there is a command to do ...
72 views

editing entries of a sparse array + sparse Smith normal form

Why does the following code ...
173 views

Restricting Numbers in a Matrix

I am generating a random N x N matrix, but with a certain restriction. What I'm trying to do is that when there's a "1" in a position, all neighboring positions must turn to "0" (so if [i,j] = 1, then ...
88 views

Graphs Plotting Discontinuous

I'm trying to plot a graph from the eigenvalues of a matrix I created. The graph shows with discontinuities in it and I was looking for some feedback. Here's the code: ...
110 views

Manipulate list in function

I have some problems with lists and functions. Basically I just want to cut all entries from the right side, which contain 2. ({2,1,2} should become {2,1}) ...
295 views

Real-like jet engine flame

I’m trying to make rocket flame and jet engine fire that is a Graphics3D object so that it can be used with a 3D rocket project. There are many types of such flames, but for starters I would like the ...
103 views

How can Map be given access to the keys of a Dataset?

Consider an example Dataset: ...
105 views

Increase Precision in Numerical Integration

I need to generate a table of Chebyshev expansion coefficients of trigonometric functions (in this case Cos[2 Pi t] to very high accuracy. Code is: ...
81 views

Different kind of numeric erros when plotting recursive functions

I have been trying to plot some numeric solutions to a Hamiltonian system. Basically I have ...
330 views

Best fit equation from a scanned image

I am trying to extract a curve from a scanned graph and find a best fit equation. For example, starting from: How could one find an equation starting from the image file ?
70 views

Consecutive integers that can be written as the product of three distinct primes

Mathematica novice here. I want to start with a list of integers that are the product of three distinct primes m,n, and o, where 2 <= m|n|o < 2000. ...
220 views

ParametricNDSolve and plotting problem

I have a problem with ParametricNDSolve: ...
182 views

Adding walls to a region plot

I've done this code: Plot3D[x + y + 1, {x, 0, 1}, {y, 0, 1}, RegionFunction -> Function[{x, y, z}, 0 <= y <= Sqrt[x]]] Producing this image: In ...
121 views

Distance between vectors does not match distance between probability distribution [closed]

I have vectors that describe shapes. I am doing Euclidian distance between vectors to get the similar shapes and I get a good results of all classes. Theoretically, two similar shapes (shapes in a ...