5
votes
0answers
84 views

Possible JLink memory leak (during) object creation

Using MMA 9.0.1 on win7-64. When creating a large number of java objects I noticed memory being consumed in huge quantities (several Gb). This memory is returned/deallocated after my call ...
0
votes
2answers
761 views

Problems with NIntegrate

I'm having trouble to do the following numerical integrations: ...
2
votes
1answer
150 views

Generate conditions seems to not work [closed]

I am trying to compute the following integral Integrate[E^(I*k*Omega*t), {t,0,T}, GenerateConditions->True] for which Mathematica returns ...
1
vote
2answers
242 views

Generic Matrices

A multivariate Gaussian distribution for $k$ dimensions looks like this: $$\frac{1}{\sqrt{(2\pi)^k|\mathbf \Sigma|}}\mathbf e^{ -\frac 1 2 \mathbf x^T \mathbf \Sigma^{-1}\mathbf x }$$ $\mathbf x$ ...
0
votes
2answers
120 views

Manipulate expression overlaid on plot of data

I am trying to use the Manipulate function in Mathematica and want to plot an expression over a scatterplot of (x,y) data. I can programme the ...
1
vote
1answer
206 views

Checkbox Matrix

Is it possible to create a dynamically changing binary $n \times n$ matrix $A$, which appears to the user as a $n \times n$ matrix/table of checkboxes and the user can change the entries of $A$ by ...
0
votes
2answers
78 views

solving series of matrices by simply multiplication

I have a number of matrices {2*2} containing element in series ....so by what method I solve that ... ...
0
votes
3answers
382 views

How to display the value of a very small number instead of “0.” [duplicate]

I need to perform an integration. There is one particular value, which may be very small that is showing up as 0.. Is there any command in Mathematica 9 that will ...
0
votes
2answers
148 views

Cannot plot a list in ListPlot3D

I have this data files: ...
1
vote
1answer
145 views

Integrate and NIntegrate yield different results for double integral

Evaluating a double integral with bivariate normal distribution yileds widely different results depending on the method used. I define a bivariate normal distribution with ${10, 3}$ and ${8, 1.5}$ as ...
0
votes
1answer
61 views

sorting of expression with complex parts

I have an expression: a + i*b + d + i*e + r = 0 Now I want Mathematica to sort this like: a + d + r + i(b + e) How can I ...
1
vote
3answers
357 views

How to show the intersection points of three functions?

How can I show the intersection points of three functions in my Plot? I really can't figure it out. ...
0
votes
1answer
110 views

Combining list x-y data with a list of errobars into one list (mathematica-style)

Suppose I have a list of data I can ListPlot: { {x1,y1}, ... } , and a list of y-errorbars: {erry1, erry2, ... } Is there ...
3
votes
1answer
205 views

What's the differences between the shift-enter and MakeBoxes running?

I know the example usages of MakeBoxes in the Tutorial like this. but I want to know a subtle distinction between (1) and (3) ...
7
votes
2answers
323 views

How to get rid of nested matrices

If I type into Mathematica TensorProduct[IdentityMatrix[2],IdentityMatrix[2]] It gives me a result that has nested matrices. How do I turn that into a normal ...
0
votes
0answers
63 views

Graphics elements in a 2D lattice [duplicate]

I'm trying to write a small piece of code that will take the RHS of a first order linear ODE and return a slope field sampled at a few points. I have written: ...
2
votes
2answers
211 views

Alternative for MapThread in listable functions

How can I rewrite this more efficiently taking advantage of flo, dem, and Nsup being ...
3
votes
4answers
294 views

How to find all symbols in an expression and perform an operation on them?

========== motivation =========== Suppose, for example, I have an incoming expression like m = (3-I)x + 4(x y)/(Cos[y]) I want to find all the symbols in ...
2
votes
3answers
192 views

PlotLegends question

Two lists: ...
3
votes
1answer
145 views

How to color a BSplineSurface

I am trying to color a BSplineSurface in a complex way but not having any luck using ColorFunction. I can use ...
0
votes
3answers
639 views

Formatting Fortran complex number output for use in Mathematica

Here is a list that was orignially output from Fortran. {{"(0.277336296055697, 0.120000000000000E+000)"}, {"(-1.489297392708939E-002, 0.340000000000000E+000)"}} ...
2
votes
1answer
105 views

Print notebook with all cells opened

I have a long Mathematica notebook where some cells on multiple levels are closed for clarity. When I export the notebook as a PDF via Print or ...
4
votes
3answers
231 views

How can I reproduce the MatrixForm, NumberForm, XyzForm behavior?

I wish to write a function like MatrixForm, that affect only display but not evaluation, i.e. a function that automatically is stripped away from output. More ...
0
votes
1answer
185 views

How to fix problems solving for values of BSpline function?

I generated a spline function called f using the BSplineFunction with domain {t,0,1}. ...
1
vote
2answers
647 views

“not a list of numbers” and “cannot be used for replacing ” [duplicate]

I am trying to plot a function which is based on the solution of some equation; I could get the correct figure but only after lots of warnings are printed out. The following is a minimum version of ...
1
vote
1answer
113 views

references in a nested matrix

I have a nested matrix n: ...
3
votes
2answers
158 views

Overwrite contents of a cell

I am trying to figure out a way to change the contents of a cell that has previously been evaluated in my notebook. To do this, I'd like to overwrite the cell. I've seen questions like How to pipe ...
0
votes
3answers
67 views

Saving many plots in files [duplicate]

I made a table of ten plots: Table[Plot[u[t, x] /. wws, {x, -10, 10}], {t, 0, 10, 1}] I want to save them all to my file system. I know, that I can save each ...
3
votes
4answers
2k views

How to add PlotLegends in a Show function?

I have multiple ListPlot in a Show where i want to add PlotLegends, but adding the ...
1
vote
2answers
152 views

Unexpected Plot3D behaviour

The following illustrates what appears to be an incorrect Plot3D for this polynomial. I have forced the function to complex argument, changed ranges. In contrast, ...
2
votes
1answer
162 views

Clear inside a loop

I want to solve a system of differential equations and each time I want to change two parameters. To prevent wrong result I want to clear every assignment after solving the equations in each ...
4
votes
2answers
156 views

Number of complex roots for the system of polynomials

I have a system of algebraic equations. For example: $$ \left\{ \begin{aligned} x^2 y + 2 x y + 2 &= 0,\\ y^3 + 2 x + 1 &= 0. \end{aligned} \right. $$ (In my problem the system contains 16 ...
4
votes
0answers
111 views

Import Excel data forcing links (ie workbooks) to be updated

We have noticed importing data from an Excel spreadsheet doesn’t update links. The problem with this is if you import a spreadsheet that comprises of linked workbooks data and those workbooks have ...
2
votes
1answer
124 views

How can I speed up this multi-equation Solve problem?

I'm trying to solve a set of equations (chemical kinetics for a complex system, but don't worry about that). I ran it for 24 hours and I got no output. Here is the relatively simple code (I want to ...
1
vote
3answers
238 views

Answer when integrating by partial fractions

Evaluating $$\int \frac{x^2-x+5}{(x-2) (x-1) (x+3)} \, dx$$ Version 9.0.1 gives the following answer $$\frac{1}{4} (-5) \log (1-x)+\frac{7}{5} \log (2-x)+\frac{17}{20} \log (x+3)$$ It seems to ...
1
vote
0answers
152 views

What's a non-trivial Mathematica program involving conscious choice of stack vs. queue data structure?

In a typical computer science algorithms course, much attention is given to the discussion of queues vs. stacks as a data structure programmers need to consciously choose from to achieve algorithmic ...
2
votes
1answer
492 views

Find area of polygon on a sphere from a set of latitude-longitude points

Given a list of latitude and longitudes say ...
1
vote
1answer
263 views

How to plot on a symmetric axis/frame

Say one had a function that was itself asymmetric about the abscissa, but one desired to plot it on a symmetric ordinate. How can this be achieved with Plot ...
3
votes
2answers
415 views

Saving graphics in Adobe Illustrator .ai format

How do I save a ListLinePlot graphic as an Adobe Illustrator file (with extension .ai)?
0
votes
0answers
34 views

Speed up series expansion [duplicate]

I have a rather complicated function that I need to expand it in series, which is quite straightforward but takes a long time. I was wondering if there is a way to speed up such a calculation: ...
0
votes
0answers
117 views

To solve an equation

I am trying to solve the equation: Solve[Re[Integrate[(2 c - (r^2) Exp[- I 1.4746])^(0.5), {r, 0, 31.7576}]] == 2.1216, c] I want to integrate an expression in ...
26
votes
2answers
842 views

Specifying non-conflicting PlotTheme options

A bug or limitation in 10.0.0 affects a few of these examples; it was resolved in 10.1.0. I am trying out Mathematica 10 on https://programming.wolframcloud.com. ...
3
votes
1answer
219 views

Combining ArrayPlot and Plot

I have two plots. plot1 is a colour graph generated using ArrayPlot. plot2 is a function plotted using Plot. I want to do two things. Scale the axes of plot1 to be the same as plot2 (instead ...
0
votes
2answers
135 views

How to use Assumptions in a Series Expansion

I want to series expansion the expression $\frac{1}{2} \left(e_1+e_2-\sqrt{e_1^2-2e_1e_2+e_2^2+4V_{12}^2} \right)$ up to second order in $V_{12}$ using the assumption $e_1>e_2$. So I tried ...
3
votes
1answer
203 views

How to control frame thickness in Grid object exported to .pdf?

I would like to export a Grid object to a .pdf document (preferably as part of a notebook). Here's an example: ...
2
votes
2answers
269 views

Extract desired solutions from Reduce

I have the function a = 1 - 3 Sin[theta]^2 Cos[phi]^2; which I solve for 'phi' when $a=0$ sol = Reduce[a == 0, phi] which ...
1
vote
1answer
100 views

Limit the output of financial indicators list

Imagine I have a list of Forex data as below: ...
1
vote
3answers
269 views

Chart with its ticks in geometric progression

I have to render a chart with an axis that has ticks with the following values: 250, 500, 1000, 2000, 4000, 8000 I first thought it was a logarithmic scale. But ...
5
votes
1answer
521 views

Problem When Trying to Export Graphics with Transparency to SVG

I'm trying to export a graph as a graphic to an SVG file with transparent background. When the background is specified as a color (or unspecified), it works just fine. When the background is specified ...
0
votes
1answer
193 views

Creating a Network from a Output

So I used the locator pane to derive the positions of a vertex on a picture. The picture was the Maryland Power Grid and the vertices were the generators and loads of the power system. When I clicked ...

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