# All Questions

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2answers
37 views

### BarChart: First Bin centered at 0 instead of 1

I want to plot an overlapped graphic comparing the experimental and theoretical data of the number of counts in a given time (beta decay), so I show them in a histogram. Because of sometimes the ...
1answer
20 views

### DensityPlot: Error messages and strange bar legend

Bug introduced in 11.1.1 or earlier and persists through 12.0 I want to plot the following DensityPlot with axes given by Trr ...
1answer
58 views

### Trying to use NDSolve to solve a system of non-linear PDEs representing the development of Alzheimer's disease over time

I'm trying to do something very similar to this question, except with a much larger system of PDEs from this paper. The PDEs are equations 1-18 in that paper. Equations 9, 10 and 15-18 have laplacian ...
2answers
18 views

### Create symmetric array of function values

I have function B[i,j] where i,j are integers. Then I create array: b = Array[B, {3,3}] now I set values of ...
0answers
42 views

### Evaluation control inside Compile

I have the following function ...
1answer
30 views

### Log contour Plot does not plot the whole range

I have the following code: ...
0answers
19 views

### Converting a contour plot in mathematica to a contour plot in matlab

Consider the table f[x_, y_] := x^2 + y^2; tab = ParallelTable[{x, y, f[x, y]}, {x, -5, 5}, {y, -5, 5}]; I can produce a nice contour plot in mathematica by then ...
0answers
9 views

### Best approach to Save the BestValidationRound throughout training

I have a network that I would like to train.I would like at the end of training to be able to have the BestValidationRound, from all training Rounds. I would not want to have ...
2answers
38 views

### Using PlotRangePadding given as a range with ListContourPlot

When I am trying to use PlotRangePadding with a fixed range (not symmetric with x and y axes) for a graphic generated by ListContourPlot, it is coming back with an error message that PlotRangePadding ...
2answers
34 views

### Remove extra space between functions and labels, when subscripts are used

I want to plot a function for different values of my parameter, 'y_a', where a is a subscript. Here is my code: ...
1answer
38 views

### How to Add a Constraint on the Derivative of the Model in FindFit

I would like to add constraints on a model and its derivatives and then use FindFit to fit some parameters. An example is below: ...
1answer
150 views

### How do I plot a plane AND a graph in ONE 3D Plot?

I want to plot the Van der Waals-equations, specifically the part in which the Van der Waals loop is shown. First I tried plotting it with the Plot3D[] function, ...
1answer
52 views

### How to definitely switch off the Check Spelling function

I formulated the question entirely enough in the title. Below I give some background to explain why do I need to do such a crazy thing. I have a son of 17 years old who has autistic problems. It is ...
2answers
306 views

### Siginificant speed difference of Integrate between 9.0 and 12.0

I just upgraded from 9.0 to 12.0, and I found some strange difference in timings for the following expressions: a. Integrate[Exp[-a*x^8],{x,-Infinity,Infinity}] b....
0answers
41 views

### How to plot rotated elliptical Gaussian beam in Cartesian coordinate [on hold]

I want to plot a rotated elliptical Gaussian beam (major axis on 45 degrees or between x and y-axis, I tried using given below code. ...
2answers
98 views

### Changing tick labels to percent

Suppose I have a graph with y values between 0 and 1 (say). How would I go about changing the tick labels to percentage (so that 0.1 would go to 10%, and so on)? Documentation seems silent on this ...
0answers
27 views

### Exponential function on matrix returned wrong answer [closed]

I'm using the newest version of Mathematica 12 Suppose the following expansion with assumption that $\delta$ was real number. ...
0answers
56 views

### How to solve this double summation question with an unknown [closed]

How to solve this double summation with an unknown in the outer sum? Any full step solution to solve this?
1answer
36 views

### How to extend the DefaultDuration of Manipulate[] when it has Bookmarks?

How to extend the DefaultDuration of Manipulate[x,{x,0,1},Bookmarks->{"beginning":>(x=0),"end":>(x=1)}] to 20 ...
4answers
102 views

### How to change plot markers in ListPolarPlot [duplicate]

I've been trying to draw a polar plot using the ListPolarPlot function with custom marker shapes. However, when I use PlotMarkers...
1answer
38 views

### PlotLegends don't match the plot's curves

Can anyone help me make the legends(markers) match with the figure curves? I have 2 figures that have three curves each, and then I have to combine them. I used the following code for the first figure:...
0answers
35 views

### Multiplying two ScientificForm? [closed]

I am computing different ScientificForm and am interested in keeping track of their individual values, as well as combining them in the end. When I multiply them ...
1answer
43 views

### How use the same Compile function with different equations

Say I have 2 equations that take the same parameters and variables that I want to evaluate numerically in compiled code ...
4answers
201 views

### How to select pairs in a list of pairs where the second pair element is within a specified range? [closed]

I have a list like the following list of pairs: ...
1answer
32 views

### Removing all sublists containing any arbitrary string as one or more of its list component

so, basically I have a list of sublists of varying length. For example, ...
1answer
39 views

### Live calculations in equation typsetting?

I want to put together an equation graphic with a live calculation in it. If I use HoldForm, it retains the formatting I want, but I don't know how to ReleaseHold (or whatever is required) to insert a ...
0answers
41 views

### Derivative operator w.r.t a vector index and change of variables

Description and code lines: Define a scalar product to represent $A_i·A_j$ , $A_i ·B_j$ and $B_i ·B_j$, such that $A_i · A_i$ = 0. This is implemented in the following way: ...
0answers
44 views

### code for coupled system in mathematica

\label{velocity} (1+\lambda{f^2}){f^{\prime\prime\prime}}+ff^{\prime\prime}+2\lambda{f^{\prime}}f^{\prime\prime}- ({f^{\prime}}+\frac{\eta}{2}f^{\prime\prime})-(f^{\prime})^2+M(f^{\...
1answer
45 views

### Use special characters or regular characters with BubbleChart

I have a list of points I want to plot. I'm trying to use BubbleChart because I want to assign to each point a different shape. How do I plot a BubbleChart with each point drawn with a different ...
1answer
41 views

### Finding eigenvalues of the Laplacian on solenoidal (divergence-free) vector fields

In Mathematica it is easy to find eigenvalues of the Laplacian in simple cases. For example, on $\Omega\in \mathbb{R}^2$: ...
1answer
61 views

### Numerically solving a system of ODEs with parameters [on hold]

I am working on solving a system of coupled ordinary differential equations with initial values given. When I searched about my requirements I got the similar answer here. But I got another condition ...
0answers
46 views

### NDSolveValue::fembdcc: Cross-coupling of dependent variables is not supported in this version

It seems that Mathematica can't solve differential equation when one of the arguments requires that the value of one variable is equal to the value of the other variable, when I try this I get this ...
2answers
51 views

### Error in a simple plotting code [closed]

I have the following code: ...
1answer
64 views

### Applying a function on several columns of a dataset fails on Missing

Consider a dataset with missing values: ...
0answers
37 views

### One Function of Two Random Variable

I wonder how to implement below derivation in wolfram mathematica. I want to see integrate results like below picture. Can you help. I used "TransformedDistribution" but it shows only distribution ...
1answer
34 views

### Plotting with sub and superscripts on the PlotLabels

Bug persists through 12.0. I'm trying to produce a plot with PlotLabels that include sub- and superscripts. However, I haven't been able to do it consistently. ...
1answer
82 views

### A question regarding 3D plot

Updated I have an equation: $x (z \ln z) = y$. For different values of $x$ and $y$ we can solve this equation for z, for example, for $x = 3$ and $y =1$, we have: ...
1answer
35 views

### Logarithmic contour plot floating point precision

The following code plots the difference between two functions in a contour plot. ...
1answer
39 views

### Solving numerically an equation with an integral

I am trying to solve the following equation numerically: Equation to solve for $y$: $$na(ay-y)^{n}\int_{ay}^{+\infty} \frac{(x-y)^{-n}}{x-ay}dx=b$$ with for example $a=4$, $n=1.25$ and $b=1.6$. I ...
1answer
25 views

### FindFit or NMinimize? Fitting a System of ODEs to Long Time Behaviour

I am looking to fit a model composed of a system of ODEs to a long term behaviour given by a single data point of the final steady state of the system (e.g., x[1000] == pi/2). I have tried using both ...
0answers
19 views

### ToExpression[“string”,TeXForm] doesn't work

I want to convert LaTeX equation to Mathematica code. I want to use ToExpression["x", TeXForm] to input some equation in Mathematica. However, my mathemtica doesn't ...
1answer
34 views

### Contour Plot not taking previously defined expressions?

I am new to Mathematica so my question might sound a bit silly, but I hope you help me. While learning ContourPlot, I have learned that when I use the previously ...
3answers
61 views

### easiest way to construct the following determinant

What is the easiest way to construct the following determinant?] p is variable, I want to vary value of p each time and get the appropriate determinant.
1answer
47 views

### Determinant of Gauss (Area of a polygon of n vertices) how to implement

A very useful procedure to find the area of ​​any irregular polygon is through the Gauss determinant. It involves drawing the figure on a Cartesian plane, setting the coordinates of each of the ...
1answer
39 views

### D: Understanding the output of 'n' th derivative of a function involving Exp[1]

I am trying to find the $n^{th$ derivate of a function involving Exp[1] as given below. ...
1answer
206 views

### How to open a Python interpreter input cell?

Something weird just happened to me: I mis-typed a keyboard shortcut, hitting the wrong keys, and a new notebook opened up with a Python prompt! Just for grins, I tried entering some simple Python ...
0answers
35 views

### How to modify the horizontal ticks in a LogLinearPlot? [duplicate]

Using the following code, ...
1answer
226 views

### Why the Kernel crashes on these integrals in V12?

Reported to WRI, [CASE:4331819] This is using V12, on windows 10, 64 bit. Note: these integrals work OK on 11.3 on same PC. Any idea why the Kernel now crashes on these types of integrals? ...
1answer
38 views

### Plot3D: Plot a piecewise function with different colors when plotting multiple function

I am plotting two functions in two variables and one of them is a piecewise function as given below. I am trying to get different colors for each of the sub-function of the piecewise function. ...
0answers
35 views

### Extract first component of values from list [closed]

If I use FactorInteger, e.g. FactorInteger[255] the result is a list like ...

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