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Anton Semechko


Last seen: 1 month ago |  Active since 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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Question


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...

5 months ago | 1 answer | 0

1

answer

Question


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 ...

3 years ago | 0 answers | 0

0

answers

Answered
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 =...

6 years ago | 0

| accepted

Answered
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...

6 years ago | 2

| accepted

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

6 years ago | 3

| accepted

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

6 years ago | 0

| accepted

Answered
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...

6 years ago | 1

| accepted

Answered
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....

6 years ago | 0

Answered
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://...

6 years ago | 0

| accepted

Answered
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...

6 years ago | 3

Answered
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...

6 years ago | 0

| accepted

Answered
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...

6 years ago | 1

Answered
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 ...

6 years ago | 0

| accepted

Answered
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...

6 years ago | 0

| accepted

Answered
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...

6 years ago | 2

| accepted

Answered
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...

6 years ago | 1

| accepted

Answered
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...

6 years ago | 1

Answered
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...

6 years ago | 1

| accepted

Answered
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...

6 years ago | 0

Answered
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...

6 years ago | 2

| accepted

Answered
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...

6 years ago | 0

| accepted

Answered
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...

6 years ago | 0

| accepted

Answered
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...

6 years ago | 0

Answered
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...

6 years ago | 0

Answered
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...

6 years ago | 1

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

6 years ago | 0

Answered
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...

6 years ago | 0

Answered
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...

6 years ago | 0

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

6 years ago | 1

Answered
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...

6 years ago | 0

| accepted

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