# All Questions

16 views

### How to make the output digital?

I tried the following codes, but the output is not in digital form. : ( Input: Output: Thanks.
16 views

### Union sorting after ignoring some digits

I have a list with its bellow elements: {-0.7071067811865476, -0.7071067811865475, 0.7071067811865475, 0.7071067811865476} If I use Union, but there is no change. Because the numbers are different. ...
13 views

### Export Plot3D in Mathematica 10.1 is Rasterized by default

When I use Export to export Plot3D to pdf format, I get different behaviour in Mathematica 10.1 compared to 10.0. In particular, ...
22 views

### Mapping Linear Model Fit Over An Arbitrary Number of sets

I have multiple sets of data, and I want to apply Linear Model Fit sequentially to each set of data. For example, below tstlst contains 3 data sets. Right now I ...
22 views

### Numerical Error between Sqrt vs Norm

Not quite sure how to reconcile this discrepancy: Norm[{16,14,4}]//N (*21.6333*) Sqrt[Abs[16]^2+Abs[14]^2+Abs[-2]^2]//N (*21.3542*)
30 views

### Gaussian Pulse Fitting with N pulses

Im in way over my head here and am fully aware of it, and hoping for some help. I've been assigned to a project where I am given data: Smooth it with a moving median: and then need to find ...
40 views

### FEM: This is not a polynomial error

Executing the program below I get the This is not a polynomial error message. I don't have an idea why I am getting this -- any suggestions ? ...
29 views

### Image smoothing with own smoothing function

I have thousands images similar to the following one: This image was produced with the following color table: ...
29 views

### Using Epilog to increase text size

I have a plot with labels positioned using the epilog function for convenience. I would like to increase the size of axes labels within the epilog function but I haven't managed to figure out a way to ...
28 views

### Partial Derivative of f with respect to x1

How can I calculate the partial derivative of a series like e.g. $$a = \sum _{i=1}^n \left(2 x_i^2+z\right)$$ with respect to $x_{1}, x_{2},... x_{n}$ using Wolfram Mathematica? I tried it with: ...
29 views

### Complex Contour Plot of Three complex variables function

eqn[x1_, y1_, x2_, y2_, a1_, a2_] := ((a1 + I a2) - (x2 + I y2))/(((x1 + I y1)(x2+ I y2)) - (a1 + I a2)) How can I plot the eqn? I need contour plot for ...
28 views

### What is the difference between Update, Run Package, Save and Install for packages?

I am building a package, using Mathematica 10.0.2.0. I notice in the displayed window for the package there are buttons labeled Update and Run Package; on the File menu, there is an item for Save; ...
22 views

### Problem with using WorkingPrecision with LogPlot

In looking at the issue referenced in LogPlot does not show all points, I noticed that use of WorkingPrecision causes really odd results on my system. A related ...
34 views

### MatrixRank of a large but sparse matrix

I want to find the rank of a very sparse, quite rectangular matrix mat, but I'm running out of RAM (I have 16 GB) if I try to use ...
40 views

### Easy way to bind rect to geometrical 2D line?

I got stuck with the following problem. For some calculation and visualization purposes I need to draw different shapes (like rectangle) with proper slope on custom line. The trivial example: ...
33 views

### 3D interpolation [duplicate]

I have four column data with first 3 column denoting x,y,z and fourth column energy. x variable is actually angle. Now I want to interpolate over all three indepdent variable (x,y.z) with ...
8 views

### Create formula to get a value [migrated]

I have clients whichs pay a monthly fee. I would like to know the accumulative total for a given quantity of month for a given fee. Plus I get 2 new clients every month. Let's say a client pays ...
36 views

### Strange result of DeleteCases in an association

The function DeleteCases can be used for associations, also with level specification. Here is an example where some values are associations: ...
32 views

### LogPlot does not show all points

LogPlot ignores points which are going to "too high" values: LogPlot[1/x, {x, 10^-12, 1}, PlotRange -> {{-.1, 1}, All},Frame -> True] gives: I'd rather ...
60 views

### Connect to USB Serial Converter

(I'm using Windows 7 & Mathematica 10) I have a sensor with RS232 serial interface. The sensor came with a RS232-to-USB converter and corresponding driver & software for data transportation. ...
275 views

### How to put an imported image in a Disk?

(This question has probably been asked before but my searches return no results.) The image below contains various ( lightblue filled ) circles ( made with the Disk function ), I want to fill them ...
163 views

### How to do make Plot automatically figure out a domain interval?

When you tell Wolfram|Alpha to plot something, it automatically figures out a reasonable domain to plot it over. When I try something like Plot x^2 + y^2 = 1000 ...
64 views

### Manipulate a 2D point controlled simultaneously by Locator and its coordinates

I'm trying to have a point in the plane which can be manipulated both using Locator as well as inserting its $x$ and $y$ coordinates. My attempts at doing this are: ...
81 views

### Solve a differential equation using the power series method

I used the power series method to solve the differential equation y’’+y=0 with y[0]=0 and y’[0]=1 using the following code. In this code “y” is considered as “y = Sum[c[i] x^i, {i, 0, n}] + O[x]^(n + ...
79 views

### How to enter piecewise functions into Mathematica [on hold]

I'm trying to enter a piecewise function (named eq30) into Mathematica. However, it seems not to work. The expression I entered is ...
58 views

### How do I make a Graphics3D Object act as a Button?

What I'm trying to do is to create a series of Graphics3D objects and let them control the display of corresponding Graphics3D objects in a different Pane and maintain the Graphics3D feature at the ...
51 views

106 views

### Random non-overlapping disks in a square

I've found a nice code snippet by @belisarius from this question, that I'll reproduce here for reference: ...
7 views

### Can someone tell me what mr is in the following code? [migrated]

I found this algorithm to convert a rotation matrix into a quaternion but i can't seem to understand which matrix mr is? If mr is the rotation matrix then what is mat? ...
57 views

### Performing a convolution for smoothing a function

I want to smooth a one-dimensional oscillating function by convolving it with another function that I'll call the screening function. This screening function should have a trapezoidal form and go to ...
48 views

### Linking to C++ files [duplicate]

I have written mathematica file that does manipulations on a certain set of points. I would like to access code that someone else has written for a least square fit in C++. How do I access this C++ ...
61 views

### Solving a transcendental equation

I want to solve the a transcendental equation, e.g. NSolve[-(1-x)*Log[1-x] - x*Log[x] == 0.5, x] Mathematica is not able to solve, wheres WolframAlpha -- is able ...
51 views

### How do I extract units from an expression

I need to take the units off of this expression: (5 Coulomb)/(6 Second) In order to do some unit simplification. Is there any way to do this? I have tried Case, but could not get it to work ...
41 views

### Set control A to a specific value if control B is ever changed?

I've had trouble with this and issues similar to this in the past, where I need to track when a controlled variable is changed. Basically I have two Sliders (call ...
52 views

### Converting a quantity to a decimal form [on hold]

I have a function giving me this: (5 Coulomb)/(6 Second) as output. I want this in decimal form and would like to have the variables taken off the end for unit ...
58 views

### Reduce Inequality

How can I reduce the inequality in terms of modulus of alpha. ...
120 views

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41 views

### How to get DistributionChart to show normalised densities?

I am having some issue getting DistributionChart to show bin widths as expected, or perhaps it is in my interpretation of the plots. I have four data sets, all of the same length, and plot them in ...
251 views

### Fitting - Exponential

I'm trying to fit the following data using Mathematica, but unfortunately im not getting any decent results. ...
216 views

### Efficiently test membership for a list of values

I have two lists: excluded and values. I would like to efficiently determine whether ...
45 views

### How to use locally scoped dynamic variables in Manipulate for expression and control parameters

I have a Manipulate that has dynamic variables that I want to use in the displayed expression and use in the parameters for the manipulate controls. I only ...
33 views

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43 views

### Write a function pollard[n, B] that tries to factor an integer n, using Pollard's p − 1 method with at most B iterations [on hold]

This is what I got but it seems it's not working. When I test it, it just goes through and nothing gets returned. Is there something I'm missing? ...
22 views

### How do I get rid of the marks at the top of bars in DiscretePlot? [duplicate]

I for some data I have ...
21 views

### How to make 3D error bars in a plot? [duplicate]

if I have the following data in this format and the error bars are the same for each point: ...
199 views

### What is the idiomatic way to shift and extend a list by a number of elements?

I have a lists, list, and want shift it right by a given number of elements, m, extending the list by repeating the last ...
12 views

### Comparing association using MatchQ [duplicate]

For me below query results into False.I expect it to return True. ...
50 views

### How to delete blank valued keys from nested association?

Considering we have: acs = <|"A" -> <|"a" -> " ", "aa" -> "asd"|>, "B" -> <|"bb" -> " "|>|> How can we come to have a result ...