# All Questions

5k views

### Complex number operations: telling Mathematica variables are real

I want to do Conjugate[a + b*I], but when I do that, the solution is Conjugate[a] - I*Conjugate[b]; when for me, a and b are ...
3k views

### problem with coloring spherical harmonics

I want to color a spherical harmonics. So I write as follows. ...
535 views

### Why does ListPlot ignore some global options?

Bug introduced in 7.0.1 or earlier and fixed in 8.0.1' Why does the following plot no use the global PlotMarkers option? ...
144 views

### Is it possible to use the global definition of a symbol as part of its new local definition set in a Block?

Consider the following expression: Block[{Print = CopyToClipboard}, doSomething[]] Now all calls to Print from ...
680 views

### Flatten nested lists

I have a list as follows lis= {a, {{{b}, {c,d,e}}, {{f}, {g,h,i}}}} which I would like to flatten to ...
462 views

### Finding a point from a set of contours such that it is nearest to a given point

I have several contour lines and one point. How can I find a point in one of those contour lines which is nearest to the given point? ...
265 views

### How to pass composite function list to SortBy?

In order to sort alphanumeric-as-string data of the form {"T3", "T14", "T1", "E2"}, so that "T14" comes after ...
358 views

### Front end crash on Export in 10.2 on OS X

Bug introduced in 10.2.0 and fixed in 10.3.0 Appears to be specific to OS X Mathematica 10.2 is reliably crashing for me when trying to export a pdf that has text with ligatures. For example: <...
287 views

### How do I determine astronomical transit times?

Mathematica, through the "legacy" Scientific Astronomer package, used to have the ability to easily determine accurate transit times of astronomical objects simply, with ...
133 views

### Filling option failing when ListLinePlot given my data

Context I want to do Filled plot such as: ...
1k views

### Simplify an expression containing NonCommutativeMultiply

How does mathematica evaluate the following expression to zero: ...
5k views

### Inverse of a complicated function

Mathematica is struggling to find the inverse of this function f(r): ...
383 views

### Define Log so that negative reals evaluate on lower edge of branch

I need to get Mathematica to evaluate the logarithm of a negative real number using the lower branch instead of the upper branch, so that while ...
278 views

### Selecting items in a list based on multiple conditions

This question has been solved. Thanks for all your help! I have data that looks like this. ...
203 views

### Substituting confidential tagged cells by a “content removed” cell

When producing a notebook with both code and text, I often end up with pieces of code, or even entire chapters, that I don't want to be shown on the final output. I generally hide or close them by ...
349 views

### Caching of Graph Graphics

In this answer, Simon Woods concludes that when you display an expression with head graph more than once, something is getting stored somewhere. I looked into it too and found out this only happens if ...
398 views

### Generalization to AllTrue, AnyTrue and NoneTrue

I am wondering if there is a natural Mathematica way to generalize those functions. To be specific, All three functions AllTrue, ...
2k views

### Why don't * and ^ work as I expected on matrices?

For example, this input... {{1, 2}, {3, 4}}*{{1, 2}, {3, 4}} produces this output... {{1, 4}, {9, 16}} and this input... <...
301 views

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107 views

### Framing a combination of cells in the notebook

In my notebook, I have the following cells, which I tried to put around a single frame with a light blue background color. After entering the cells, I selected all four, then clicked the frame ...
578 views

### How can I scale a plot in vector graphic or PDF form?

I am not at all a computer graphics expert, but it seems that portable document format (PDF) files have a "native size," even though they may (and usually do!) contain vector graphics that can be ...
253 views

### How to count all cliques (not just maximal ones) in graphs?

How can I count the numbers of $r$-cliques in a graph? In other words, the number of triangles, the number of $K_4$, the number of $K_5$ etc. I have tried for example ...
483 views

### CDF and personalized style

I recently created a custom stylesheet. I then created a notebook with the new style, confirmed that the notebook had adopted the style, and then saved a copy in CDF. But when I opened the CDF in ...
396 views

### Treat all variables as local in a module [duplicate]

In most languages, any variable defined inside a function is considered local. ...
152 views

### How to grab output from evaluating input cells in a generated notebook

The notebook expression resulting from ... ...
761 views

### Replace interior of matrix with zeros

I have f.e. the following square matrix: ...
106 views

### Iterator variable not blocked in ParametricPlot

Bug introduced in 10.0 and persisting through 10.2 or later It appears that perhaps the iterator variable r is not Block-ed ...
210 views

### Keywords to find documentation for this syntax

Mathematica allows this syntax, but I cannot find any documentation (or books) that discuss the various uses/advantages of it ...
414 views

### Retrieving duplicates from nested list

Consider the following: data={{1,a},{10,a},{5,b},{4,c}}; In my case duplicates are defined when for {x1,y1} and ...
110 views

### PlotMarkers shadows the settings by Style

The code below gives color-varying points with explicit Style wrappers: ...
749 views

### Finding differences between Pi with varying number of decimals

I have the following code In[32]:= N[Pi, 2] Out[32]= 3.1 In[33]:= N[Pi, 1] Out[33]= 3. In[34]:= N[Pi, 2] - N[Pi, 1] Out[34]= 0.*10^-1 Why can't Mathematica ...
1k views

### Why does Export drop namespace prefixes in the exported XML file?

I am trying to generate an Excel-compatible XML file from Mathematica. First, I created a test XML file by saving a Microsoft Excel workbook as "XML Table". Then I ...
359 views

### Generate PrimePower counting function

Is there a way to generate a counting function for prime powers - i.e. to create a similar function to PrimePi, but including prime powers. The following will, of ...
234 views

### Decomposition of a semialgebraic set into connected components

Is there any built-in function for doing decomposition of a semialgebraic set into connected components? The only way I now can think of is to use ...
277 views

### Remove versus ClearAll

What is the difference between Remove and ClearAll? I thought that "not being recognized by Mathematica", which is the effect ...
423 views

### Finding All Chordless Simple Cycles In A Graph

I am doing a research on networks which consists of polygons with different number of sides. I am trying to find all simple cycles in a network which are chordless. As an example, consider the ...
456 views

### Combining and aligning “chart” type graphics with regular plots

Is there an easy (recommended) way to align regular plots (e.g. ListPlot or Plot) with chart type graphics (...
197 views

### Obtain input expression from history without evaluating

I typed and evaluated an expression, but deleted it from the notebook. For instance, suppose it was In[1]:= Round@SessionTime[] Out[1]= 2 I now want to retrieve ...
900 views

### Indenting bulleted lists in Notebooks

I currently use Word for notes, making nested bulleted lists as I go. I've just started using Mathematica and would like to do the same in its Notebooks, but it doesn't look like it has that ...
597 views

### how to read in a file in the same directory?

Now I am writing a small package. I have written several files and put them in the same directory. And some files need to read in or include another file in the same directory. But when I simply write ...
710 views

### How to make a point's position time-dependent given a formula for the next step?

I've made a program that is just some points on a plane. Red points are cops and green points are robbers. Each point has a vector indicating where it is going to be in the next step of $t$. Right now ...
129 views

### Monitor function doesn't show continious change of values

Bug introduced in 10.0 and persisting through 10.3 Mathematica version: 10.2 Monitor[i = 0; While[i < 100, Pause[0.1]; i++]; i, i] The above code is from ...
264 views

Is it possible to convert the following list of strings to computable numbers with the comments preserved? ...
281 views

### How to “undo” SetOptions (restore defaults)

Say I had some good reason to use, for example SetOptions[Plot,ImageSize->500, LabelStyle->OutrageousPink]; But now sometime has passed, life has changed, ...
1k views

### How to rotate TickMarks in DateListPlot?

Is there a way to rotate TickMarks in DateListPlot to avoid overlap, eg: Part of the code used to generate this is: ...
870 views

### How do I display an expression with negative powers?

How do I display an expression with negative powers? Mathematica seems to always invert a term with a negative rational power. None of the following work: ...
345 views

### Series expansion for small ratio of variables

I have a messy expression of variables that I would like to simplify under the assumption that certain ratios of the variables are small. For example, consider $\sqrt{x+y}\;$ expanded for small \$\...
195 views

### RegionIntersection puzzle

I am using RegionIntersection[] to intersect two rectangles, phrased as Polygon[]s: ...