Anton Semechko

Last seen: environ un mois il y a | Actif depuis 2012

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Biomedical/R&D engineer with 10+ years of academic + industry experience and avid user of Matlab for 15+ years. Enjoy problem-solving and working on projects related bio-signal processing, medical and microscopy image processing, computational anatomy, and machine learning.

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Where is the search bar on the Matlab File Exchange website?
This is more of a recommendation to the MathWorks website developers rather than a quesiton. I don't use File Exchange (FEX) of...

6 mois il y a | 1 réponse | 0

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none of the axes interactions are working in axes embedded in a UIFigure panel
Problem: The interactions of an axes object embeded in a UIFigure panel are not working. The interactions I am trying to add to ...

plus de 3 ans il y a | 1 réponse | 0

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PCA on high dimensional data
A 13952736-by-104 data matrix (with observations along rows and variables along columns) will take up 13952736*104*8/2^30 =...

plus de 6 ans il y a | 0

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Fitting scattered data to multiple cosine functions
Below is an example where I use brute-force search to find an optimal set of sinusoid parameters that best fit an unorganized da...

plus de 6 ans il y a | 2

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imshow() not working
Use syntax: imshow(im,[]) when im has non-integer format. Or just do this: im = imread('/MATLAB Drive/My Project/ima...

plus de 6 ans il y a | 3

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distance of points to points calculation
Use <https://www.mathworks.com/help/stats/knnsearch.html#namevaluepairarguments 'knnsearch' function>. For example: [idxA,D_...

plus de 6 ans il y a | 0

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How is the number of bins chosen with the auto binning algorithm in histcounts?
'histcounts' first estimates width of the histogram bins using 'scottsrule': rawBinWidth = 3.5*std(data)/(numel(data)^(1/3...

plus de 6 ans il y a | 1

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Barycentric Coordinates of a spherical triangle
This can be done in four steps: 1) Compute linear transformation (T) that maps triangle A to its counterpart B on the sphere....

plus de 6 ans il y a | 0

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How do I use a .lut file (or the equivalent in MATLAB) to reference pixels in a grayscale image and assign them new values for pseudocoloring based on the LUT?
There is a Matlab function that maps gray values to RGB values using custom made look-up-tables. Its called 'ind2rgb': <https://...

plus de 6 ans il y a | 0

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Transformation of the complex plan: Conformal Mapping
Modified code ('conformal_map_demo') is attached below. In principle, this piece of code should should allow you to visualize an...

plus de 6 ans il y a | 3

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How to sum each column element of one matrix with all column elements of another matrix?
Do kron([a b;c d],[1;1]) + kron([1;1],[i j;k l]) Here is an example using symbolic expressions syms a b c d i j k l...

plus de 6 ans il y a | 0

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Generating sets of non repeating random numbers
Here is an example: S=reshape(randperm(40),[],4); All elements in S will be in the range [1 40] and unique. From this it...

plus de 6 ans il y a | 1

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3D plane plotting restricted by 3 points
Equation of a plane is determined uniquely by any 3 (noncollinear) points lying on the plane. Based on your question, it sounds ...

plus de 6 ans il y a | 0

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Could anyone help me with extracting similar features( to be used as corresponding points)in two images which need to be registered together?
Hey, Poupack, here is <https://drive.google.com/open?id=1SRXAVFkbHPfQ9jLjsFL-fkfWz2KrKJAO link> to a function ('pairwise_his...

plus de 6 ans il y a | 0

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How can I extract the slices of a 3D matrix in x-direction from a 3D matrix?
Suppose you have G, which is a Y-by-X-by-Z 3D array, then i-th xy slice: G_yx=G(:,:,i); % Y-by-X array i-th xz slice...

plus de 6 ans il y a | 2

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Multivariate nonlinear regression model fitting
If the function you are trying to fit is linear in terms of model parameters, you can estimate these parameters using linear lea...

plus de 6 ans il y a | 1

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How to export 3D spheres (3D plot) generated in Matlab to ANSYS or Abaqus. ?
The builtin 'ellipsoid' and 'sphere' functions produce bad quality meshes (in terms of element shapes and connectivity of the ve...

plus de 6 ans il y a | 1

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Is there a way to open music and play it?
Yeah, there is a way. Here is an example: % Get sample audio file from the web [y,Fs]=webread('http://www.worldnationala...

plus de 6 ans il y a | 1

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How do I compute the maxpool of a image? Let us say stride of 2,2 on a mxn matrix?
Here is an example: % Sample image im=imread('cameraman.tif'); % sample image % 4 pixels comprising non-overlappi...

plus de 6 ans il y a | 0

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How do I plot a plane that has points of different values?
Actually, based on the sample picture you provided, you have a total of 17x21 grid points, and total number of cells in the g...

plus de 6 ans il y a | 2

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Obtain Number of Pixels in Area Around Binary Image Object
To distinguish between points/pixels inside the ellipse vs. those outside, you need to know parameters of the ellipse. Here is a...

plus de 6 ans il y a | 0

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subplot with multiple images - Pulling images from API into one figure
Hey, Vincent. Here is an example: [IM,IM_all]=PubChem_compound_image_stacking_demo; <</matlabcentral/answers/uploaded_fi...

plus de 6 ans il y a | 0

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How do you generate a Cumulative Histogram on R2014a?
Here is an example of how to use 'histcounts' and estimate percentiles: % Simulate data; N samples from standard Guassian P...

plus de 6 ans il y a | 0

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I want to plot a numerical integral in a mesh which is dependent of x and y. How can I do this?
The integrals in your equation can be evaluated analytically. Here how you can visualize C(z1,z2) and C(z1,z1): L = 20...

plus de 6 ans il y a | 0

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Interpolating scattered 3 dimensional data
Hi, Markus, here is a demo of how to perform linear interpolation of vector fields on a unit half-sphere: half_sphere_inter...

plus de 6 ans il y a | 1

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Taylor expansion with 2 variables
Taylor's theorem generalizes to multivariate functions. Formula for third order approximation of a bivariate function can be fou...

plus de 6 ans il y a | 0

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Troubleshooting Isosurface Rendering Code
Make sure that your 'Image' variable is cast as a double and actually has a zero level-set. Here is an example: % Samp...

plus de 6 ans il y a | 0

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How to find distance between two nodes? including the nodes.
Download <https://www.mathworks.com/matlabcentral/fileexchange/5355-toolbox-graph graph processing toolbox> from FEX. Use Dijks...

plus de 6 ans il y a | 0

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how to deal with large polygons ?
Check out 'DecimatePoly' function on FEX: <https://www.mathworks.com/matlabcentral/fileexchange/34639-decimate-polygon> Inclu...

plus de 6 ans il y a | 1

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Detection of line segments and length
It doesn't look very clear to me, and is maybe the reason why the Hough transform isn't generating the output you want. For exam...

plus de 6 ans il y a | 0

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