Questions tagged [smoothing]

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1 answer
42 views

Is there a filter for smoothing out data that only changes the last incoming value that isn't MovingAverage?

So I'm studying financial markets and I want to smooth out some data. This can be achieved by using MovingAverage(MA) or ExponentialMovingAverage(EMA) but I'm trying to find something better. There ...
5 votes
4 answers
533 views

Dealing with derivative of noisy experimental data

I have the following (time, position) dataset ...
1 vote
1 answer
82 views

How to show all bandwidth in adaptive bandwitdh KDE?

I have implemented the KDE distribution finding for a dataset. I apply the adaptive bandwidth method; I want to plot the change in bandwidth over the entire distribution. How can I do it? Thank you!
2 votes
1 answer
92 views

Calculate the mean value from point inside a 2D contour

I saw a question about creating contour lines over a smoothdensityhistogram plot. It really help me to create this kind of graphs. I want to ask if is possible to extract only the points inside a ...
8 votes
1 answer
310 views

How can I prevent conversion of a SparseArray to a DenseArray?

The Problem I'm trying to implement an efficient Whitker-Eliers smoother in Mathematica. In Matlab, this is a few lines of code (taken from the SI of the above paper): ...
1 vote
0 answers
59 views

Problem with dividing two functions

Here is my code ...
1 vote
2 answers
116 views

Smooth out numerical fluctuation at known point

I have the following function ...
1 vote
1 answer
146 views

Why does the derivative of an InterpolatingFunction fluctuate so much?

...
0 votes
0 answers
23 views

Listdensityplot sort of smooths the data when I don't want it [duplicate]

I tried plotting a densityplot and it gives me an image what I expected. like this but after a split second it kind of updates itself to why is its dynamically smoothing itself? I want the first one....
6 votes
1 answer
3k views

How to calculate the first derivative from experimental data

I have a set of experimental data and need to calculate the first derivative. What is the easiest way to do this? Many thanks in advance
2 votes
1 answer
155 views

Moving average over a dataset

I have this data set in .csv and I imported them to mathematica to analyze them using Import function. Now here I have only shown a part of the dataset just to give an example of how it looks in Excel....
1 vote
2 answers
179 views

Plot two smooth curves from a set of data with interlaced points

I have a set of data which was obtained from numerical calculation. The plot of the original data is as follows (the data is 26Kb only). ...
2 votes
1 answer
222 views

How can I smooth sharp edges in ListDensityPlot

I have this data and there are some zigzag behaviors around the sharp edges ...
11 votes
5 answers
733 views

How to get a smooth outline

I have a outline image img=Uncompress[FromCharacterCode[ Flatten[ImageData[Import["https://i.stack.imgur.com/cc0Mt.png"],"Byte"]]]] This is current method <...
2 votes
2 answers
130 views

Removing a crease artifact in a surface of revolution SphericalPlot

Consider the surface ...
9 votes
3 answers
521 views

Smoother boundaries between components of segmented image

I'd like to use boundaries between components of a segmented image to create a mesh for finite elements, as described in Mesh for Images for three materials and meshes with multiple regions from 2D ...
1 vote
1 answer
326 views

2D kernel density estimation (SmoothKernelDistribution) with bandwidth estimation: what are the values that Mathematica chooses?

Mathematica has built in bandwidth estimation including the rules Scott, SheatherJones and ...
13 votes
2 answers
1k views

Catmull-Clark and Doo-Sabin Subdivision Implementations

I want to work on subdivision surfaces. Unfortunately, I don’t have any source code to start with. I need some Mathematica codes for applying Catmull-Clark and Doo-Sabin methods. I would like to ...
0 votes
0 answers
67 views

How to calculate smoothing constant alpha in ExponentialMovingAverage?

I'm trying to use ExponentialMovingAverage on a time series, but I'm not sure how I'm supposed to calculate the smoothing constant. I read that the appropriate ...
5 votes
0 answers
390 views

Histogram (automatic binning)

There are different methods for choosing widths of bins for a histogram, like Freedman-Diaconis rule. In Mathematica, without choosing a specific method, with the command ...
0 votes
2 answers
162 views

How to smoothen a contour plot?

I want to smoothen the following contour. ...
1 vote
2 answers
565 views

How to smooth data

I have a list of the form dataTosmooth={{a,b,c},....} where a and b are coordinates and c is the data to be smoothed. In other words, smooth dataTosmooth[[All,3]] along dataTosmooth[[All,{1,2}]]. What ...
5 votes
2 answers
2k views

Smooth Boxcar function (Rectangle Pulse function)

There are some answers on how to get a smooth squarewave function. But I would like to have a smooth boxcar function or rectangle function with 2 different widths.: ...
31 votes
2 answers
2k views

Smoothing 3D contours as post processing

Context Following this question (and great answer!), It would be nice to have a function which also smooths 3D contours plots once they have been done. There are various solutions which involve ...
3 votes
2 answers
382 views

Approximate the piecewise constant with a smooth function

Let us first define a two regions as follow : inner=1;outer=2; reg1 = Disk[{0, 0}, inner]; reg2 = Annulus[{0, 0}, {inner, outer}]; glass=1.5;air=1; Now let's say I ...
2 votes
1 answer
375 views

Smoothing an irregular TimeSeries and calculate it's Derivative

I've a data set consisting of two columns, the first column is a date and the second is a numeric cumulative amount. I tried to create a time series, resample it and smooth but I couldn't manage to ...
1 vote
1 answer
429 views

Smoothing a function after interpolation + trying to fit 3D data into model without accurate prior knowledge

I have a physical problem simulation that generates this data set in the two cylindrical coordinates $(r,z)$ (doesn't include $\phi$ dependence). The data set (see .wdx file) is in the flattened form $...
1 vote
1 answer
186 views

How to remove spikes from boundaries in ListContourPlot?

I have a table with three columns, that is of the form {{x1,y1,z1},{x2,y2,z2}....}. I have done a ListContourPlot with it. But the contour boundaries have spikes in it. What might be the reason and ...
1 vote
1 answer
164 views

Smoothing a dataset

I have a dataset, named data as follows: data = Transpose[{Table[i, {i, 1, 10, 0.1}], N[Table[Log[i] + RandomReal[0.5], {i, 1, 10, 0.1}]]}]; I need to ...
6 votes
1 answer
2k views

How can I improve ContourPlot to get smooth curve?

I am working on the ContourPlot to creat contour line of a InterpolatingFunction recently. This is my data. This is my simple ...
17 votes
3 answers
1k views

Rounding an Irregular Polygon

Consider a random irregular convex polygon, for example, the 6-side polygon I want to define a function that, given a certain parameter r (roundness), rounds each ...
3 votes
1 answer
164 views

Code or algorithm for the built-in function SavitzkyGolayMatrix

Does anyone know the algorithm that the function SavitzkyGolayMatrix implements? Unusually, the help page does not spell out an explicit formula or the algorithm ...
2 votes
1 answer
462 views

Calculate and plot mean values of pairs of data points

I have a list of data points where there can be multiple y values for a given x value, e.g., {{0, 4}, {1, 2}, {1, 3}, {2, 3}}. I would like to Take the mean of the y values for each x value. Get a ...
13 votes
3 answers
893 views

Improve the mesh smoothing procedure

My question is inspired by this answer about meshing with quadrilateral elements. The following functions are my (naive) try of implementing the Laplacian smoothing. I find interior nodes in the mesh ...
1 vote
1 answer
147 views

Moving map with non-overlapping window

How can I apply a function to a list with non-overlapping window. E.g. $data = \{x_1, x_2, ...., x_n\}$ and we apply f with window size 2 to get $\{f(x_1,x_2), f(x_3, x_4), ...., f(x_{n-1}. x_n)\}$. ...
4 votes
0 answers
153 views

BSpline vs natural spline [closed]

The BSpline in mathematica is defined mathematically here. These BSplines constitute basis for any Spline. But how do I define natural splines in mathematica, i.e. splines that are linear left of the ...
0 votes
0 answers
43 views

RegionPlot with FindMaximum

I don't understand why each time I'm launching this computation Mathematica buggs and I get a message from Windows that the Kernel stopped working... I'm trying to get a map of where the value of ...
9 votes
1 answer
470 views

Smoothing the gradient of the potential function from a finite element calculation

The results from a finite element calculation using NDSolve are, in this case, a potential function expressed as an interpolation function. To get values from the potential function it is necessary to ...
2 votes
1 answer
317 views

How to make the ListContourPlot3D smooth and closed?

I am struggling with making my plot in ListContourPlot3D smooth and closed. I have seen so many posts regarding the same issue but in other functions, the solution of which can not be applied to ...
0 votes
3 answers
286 views

Smoothing random data with MovingAverage

If I have this kind of data: ...
3 votes
1 answer
538 views

Changing the averaging window dynamically in a moving average

I have some temperature decay data (2k points) that is very noisy for large time values. I don't want to do much or any smoothing to the data early on, but would like a large window to average over ...
36 votes
1 answer
2k views

How to perform Loop subdivision on a triangle mesh with Mathematica?

(Cross posted on Wolfram Community) Every now and then, the question pops up how a given geometric mesh (e.g. a MeshRegion) can be refined to produce a (i) finer ...
1 vote
0 answers
51 views

Smoothing the surface created from a set of points

I have a question about "smoothing" the surface created on the basis of a set of points. I would like to get an effect similar to that from the Documentation Center. enter link description here The ...
5 votes
4 answers
1k views

Smoothing noisy data

I have this data shown in picture 1 below and I want to filter it. I tried some filters but I couldn't get good results. seems that I didn't choose the best parameters for it. I want to smooth my ...
1 vote
0 answers
175 views

Smoothing 2-d Functions [closed]

I have a large array of triples (x_i,y_i,f(x_i,y_i)) The the values x_i and y_i are equidistant variables and the function values f(x_i,y_i) are results of a Monte Carlo calculation which contain ...
20 votes
3 answers
966 views

Generic contour smoothing with shading

Context It would be nice to have a function which smooths contours plots once they have been done. There are various solutions which involve smoothing the data before making the contours, but here I ...
0 votes
0 answers
66 views

Smoothen curve in ListDensityPlot [duplicate]

I have a list of points of dimensions (150,101) and I am plotting them in a ListDensityPlot. I am happy with the command and how the data is represented, but I ...
2 votes
1 answer
182 views

Smoothing EdgeDetect - image processing

I have to make a program that analyzes the image of saw tooth and later find the function that can describe it (or just part of it). Now I have a problem with smoothing the edges detected with ...
6 votes
3 answers
547 views

How to find the boundary of a region from a dataset

I have a dataset which supposed to show some regions. For example ...
9 votes
3 answers
740 views

How to smoothen a surface given as a mesh?

I am trying to "smoothen" meshes. For example, if starting from a cuboid, I would like something similar to a rounded cuboid. There are many ways to smoothen a surface, but I am not going to give a ...