Anton Semechko

Last seen: 3ヶ月前 | 2012 年からアクティブ

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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質問

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年弱前 | 0 件の回答 | 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 =...

5年以上前 | 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...

6年弱前 | 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...

6年弱前 | 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_...

6年弱前 | 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...

6年弱前 | 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....

6年弱前 | 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://...

6年弱前 | 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...

6年弱前 | 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...

6年弱前 | 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...

6年弱前 | 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 ...

6年弱前 | 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...

6年弱前 | 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...

6年弱前 | 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...

6年弱前 | 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...

6年弱前 | 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...

6年弱前 | 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...

6年弱前 | 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...

6年弱前 | 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...

6年弱前 | 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...

6年弱前 | 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...

6年弱前 | 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...

6年弱前 | 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...

6年弱前 | 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...

6年弱前 | 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...

6年弱前 | 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...

6年弱前 | 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...

6年弱前 | 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...

6年弱前 | 0

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Can I recover only the diagonal elements of A' * B with SVD vectors of A and B?
i-th diagonal of A'*B equals dot product of the i-th columns of A and B. Here is a demo showing how to recover only the diagonal...

6年弱前 | 0

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