# All Questions

52 views

### Is it possible to calculate with declarations only?

simple Example: maximize $u(x), x$ solution would show constraints: $\frac{\partial u(x)}{\partial x} = 0$ $\frac{\partial^2 u(x)}{\partial x} < 0$ etc... or do I always have to explicitly ...
389 views

### How to simultaneously change the color and thickness in ContourStyle?

When plotting contours with ContourPlot, one can use the option ContourStyle to change the contours of the plot. With the ...
42 views

### Addition of all elements of two sets with each other [duplicate]

Let $S_1=\{a_1,a_2,\ldots,a_m\}$ and $S_2=\{b_1,b_2,\ldots,b_n\}$ be two sets. I want to list all $a_i+b_j$ for each $1\leq i\leq m$ and $1\leq j\leq n$ in a set. Is there a commend in mathematica for ...
894 views

### Solve symbolically a transcendental trigonometric equation and plot its solutions

I currently have the equation below for a beam with a hinge at various locations, the variable a can vary between 0 and 0.5.  Tan\left( {a\sqrt \alpha } \right) + Tan\left\{ {\left( {1 - a} ...
109 views

### Why won't mathematica plot the 3D Contour of this function?

I want to find the 3D contour of the equation1: ...
137 views

### Get part of lousy data

I want to get part of large data. some part of this data is as follows: ...
159 views

### Legend in a Show

I am trying to put some legends on a graph but I am not able to do that. This is my code: ...
121 views

### How can I speed up this code？

There are 4 variables in this multiple sum, and only 2 are used. This question has the similar scenario as the previous one How can I speed up this code with multiple sum？, but the calculation ...
164 views

### Format-Size-Larger/Smaller shortcut disabled in M10?

It seems that the keyboard shortcuts for enlarging/reducing the font size (ALT+= / ALT+-) don't work anymore in M10 as it did in M9. If I select the text (or code) inside a cell they work. But if I ...
461 views

### Does FindFit support complex numbers or doesn't it?

Inspired by this previous question: Findfit doesn't give the good fit; Changing the starting values will not change the results. Consider the following complex-valued dataset. ...
281 views

### Command to insert item into list

Is there a command to insert an item into a list such that they form pairs? In other words to take InsertObject[{a,b,c},d] which will output ...
61 views

### How to make a discretized NMinimize more precise

I am using Mathematica for physics research and I want to minimize a Hamiltonian equation with respect to two variables (I have also discretized the problem). I have a single constraint. When I plot ...
193 views

160 views

### Expand 2f[x] to f[x]+f[x] (Simplify sums of ArcTan)

I'm trying to simplify an expression with sums of ArcTan, for which I've written a transformation rule that works for simple sums, so that ...
927 views

### Why is the new PositionIndex horribly slow?

This issue has largely been mitigated in 10.0.1. New timings for the final test below are: ...
155 views

### VoronoiMesh for 3D points

I believe that this is a doc error in V10 (this was programmed to be but not implemented). The new VoronoiMesh should work for 3D set of points. The ...
105 views

### Warning and Errors during Compile

I defined a compiled function cf = Compile[{{x, _Integer}, {n, _Integer}}, z = (n^x); Binomial[n, #]* StirlingS2[x, #] *(#!)/z & /@ Range[x]]; and I ...
541 views

### Normal // Association // Dataset workaround for some user query operators

Given example tabular data (ie, with rows and columns, or "data frames") ...
327 views

### How to get a uniformly distributed list of points from a B-spline function [duplicate]

I created a spline function from a list of points and made a plot as follows: ...
174 views

### Poincaré Section

I have encountered somewhat the same problem as here. But with the equations, $x'(t) = p(t), p'(t) = - x(t) - y(t), y'(t) = q(t), q'(t) = - y(t) - x(t)$ My code is, ...
333 views

### Findfit doesn't give the good fit; Changing the starting values will not change the results

I have some complex data: ...
56 views

### Cannot save array to CSV file from EvaluationMonitor[]

Here is my Mathematica function. ...
238 views

### DeleteCases that match partially [duplicate]

Say I have a list of strings L , L2= "some_text-to-delete" and I want to delete all the Li that match with "text" or "delete" DeleteCase only gives the ones that match exactly...
102 views

### How do i import a list of files, choosing the name

I have this list of files, i'm using FileNames[{"*.txt"}, NotebookDirectory[]] to import it, but i just want the ones without inelastic on the name. How can i select just by the name? Thanks ...
119 views

### Autocomplete of non-global functions

In Mathematica 9 and 10 they added autocompletion. Out of the box this works great, but when I set the CellContext to "Notebook" instead of the default "Global" (following this) it no longer ...
83 views

### Reduction of repetitive calculations in Table

If I generate two tables inside a function which are function[n_, x_, y_]:=( table1 = Table[i* x/n^x, {i,1,n}]; table2 = Table[i* y/n^y, {i,1,n}]; ) where ...
83 views

### Using PatternSequence on its own in ReplaceAll?

Say I have this list: list = {0, 1, 2, 0, 1, 3, 0, 1, 4} and say I want to remove consecutive sequences of 0 and 1. I'd normally go for this: ...
87 views

### A problem with “RiccatiSolve::ncsol: Cannot compute a stabilizing solution to the matrix equation ”

I have a SSM ( State Space Model ) and I want to calculate its optimum gains unisng LQOutputRegulatorGains[] command. When I run the code, it solves the equations ...
173 views

### Setting and changing MetaInformation for arbitrary objects

I work with a lot of dynamic data in {{date, datum}. . .} format, ...
97 views

### Kernel quits on closing notebook

Mathematica quits (exits) when the single notebook I'm working on is closed. How to prevent this? Win7, v10 Mathematica
142 views

### Hungarian Algorithm using BipartiteMatchingAndCover Function

I have a bipartite graph with two sets of vertices. ...
134 views

### Distance between data and curve

I have two datasets: ...
139 views

### Using levels in MapIndexed

I am trying to use MapIndexed to manipulate a matrix of data but I am having trouble getting the levels parameter to work the way I would like. Suppose that my data ...
287 views

### Bug in handling backslashed Cyrillic symbols in v.10.0.0?

UPDATE: In version 10.1.0 the described bugs are fixed. Now both the inputs "\б" and "\\б" are interpreted as ...
123 views

### Optimizing a functional using variational calculus

Here I am, trying to get the trajectory $(x(t),y(t))$ that will minimize the following Lagrangian (i.e. the integrand of the functional) between $(-1,-1)$ and $(-1,y_{eff})$ where $x_{eff}$ is defined ...
265 views

### Dispatch not behaving like a normal expression in Mathematica 10

In Mathematica 9, I used to be able to do rules = Dispatch[{'a' -> 1, 'b' -> 2}] rules[[1]] to extract the rules from ...
85 views

### Save plot by pressing on button

I want to save a certain graphics by pressing a button. Thinks work fine for something like this ...
92 views

### Can I change the font of all elements in my barchart with one property?

I have this BarChart: created with this code: ...
365 views

### How to set an absolute path name using SetDirectory?

I tried the following: Directory[] /Users/John SetDirectory["Library/Mathematica"] ...
512 views

### Shorter syntax for Fold and FoldList?

I find it tedious to write out the following: a = {1, 2, 3, 4}; Fold[f, First @ a, Rest @ a] f[f[f[1, 2], 3], 4] It ...
110 views

### How can I make labels with units and then position the label to the right of a bar?

I want to add units to my numbers to display them as the labels of my chart. I tried this: ...
575 views

### Where is the “Function Navigator” and “Virtual Book” gone?

Under V9 "Help" was a Item each for "Function Navigator" and "Virtual Book" to find and one could work with it. Under V10 these Helpers are gone. Although under Documentation/English/System the ...
3k views

Note: Answering my own question as a wiki for future reference. When loading a .Net DLL: ...
671 views

### Mathematica 10 crashes on copy/paste

Mathematica 10 crashes in the following (simple) situation: FormulaLookup["gas"] This command will produce a long list of possible formulas. Then I type the ...
147 views

### Multiple down-values with exactly the same lefthand side

I was working on an answer to this question, when I was sidetracked by what I bring up here. I wanted a function, which when given a string representing a binary number, would convert the string to a ...
50 views

### Why TeXForm[] do not display to notebook if followed by OutputForm[] in same cell?

Can someone please explain to me the logic of this: In one cell, when writing ...
411 views

### Are there any tutorials on version 10 notebook templating and report generation? Are there missing docs?

I am trying to understand the new templating in version 10. While there is a general documentation page with links to docs for each new function, so far I am unable to find any report generation ...
50 views

### how to create a slope field in mathematica? [duplicate]

Anyone have any good resources for learning mathematics, already sufficient in JAVA. not math... only in calc 2. I want to plot the slope field of ...