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Matthew


Bitplane Inc.

Last seen: 1 year ago |  Active since 2014

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Professional Interests: image processing, life sciences

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Is there a way to extract the 3D Voronoi polygon lines
I have a way to take 2D Voronoi, and generate an overlay image of the lines that make up the Voronoi polygons. I am looking to ...

6 years ago | 0 answers | 0

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answers

Question


How can i reorder NxM matrix into a 1D array
I am looking to take a sample matrix below. The matrix will be large and looking for fast and non looping solution. Thank you....

6 years ago | 2 answers | 0

2

answers

Question


How do i make this matrix simply
I am looking for an easy way to make this Nx2 matrix starting at [0 1]. Every other line the numbers are the inverse of the pre...

6 years ago | 1 answer | 0

1

answer

Question


How do i get all the vertices of the polygons in Voronoi 2D plot.
I am looking for a way to get all the vertices of Voronoi plot, I know i can use this: [v,c] = voronoin([x(:) y(:)]) This ...

8 years ago | 1 answer | 0

1

answer

Question


Reducing a population of points in the 3D plot
I have an 3D image with a population of vertices with X,Y,Z coordinates placed in the volume. The number of vertices can be ver...

8 years ago | 0 answers | 0

0

answers

Question


subtract each row from from matrix A from all rows matrix b
I have these 2 matrices. I am looking to subtract each row in B for all rows in A. The result put into a C. A = [1 2 3;4 5 ...

8 years ago | 1 answer | 0

1

answer

Question


Measure the distance of multiple spots to a several line segments
I have 2 populations of 3D points placed on opposite sides of an volume (3D). I want to draw an orthogonal line from each point...

8 years ago | 0 answers | 0

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answers

Question


changing specific rows of a logical matrix
I have a vSlice=MxN logical matrix. I want to be able to review the first row, last row, first col and last col for "1's" and c...

8 years ago | 1 answer | 0

1

answer

Question


measure distance between mutiple positions without looping
I have two arrays of XYZ positions data, Spots1 and Spots2. Code below loops though each Spot2 position and measures the distanc...

8 years ago | 2 answers | 0

2

answers

Question


Finding matching rows in matrix for multiple points without a loop
I have matrix A=[1 2 3;4 5 6;7 8 9;9 8 7;6 5 4;3 2 1] B=[4 5 6; 3 2 1] test = [2 6] I want to be able to list the ...

9 years ago | 1 answer | 0

1

answer

Question


How can I reorder paired points
I have sequence of paired points. The rows need to be reordered in such a way as listed in the "result". Values in col 1 are ...

9 years ago | 2 answers | 0

2

answers

Question


Reorder a matrix relative to another
I have investigated all day the different ways to do this, and I have not been able to come up with a plan to achieve exactly wh...

9 years ago | 1 answer | 0

1

answer

Question


Command Window and debug mode
When i launch a script in debug mode, the script fails at a particular line. This occurs when I step through the code, line by ...

9 years ago | 0 answers | 0

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answers

Question


Get xyz position of points along a line between 2 points along a 3D triangular mesh
I have a 3D triangular mesh. It is defined by vertex positions and triangles. I would like to be able to select 2 vertices...

10 years ago | 1 answer | 0

1

answer

Question


using ismember to select row
I am trying to use ismember, but not exactly sure it will do what i need. I have an matrix of indices, not necessarily a sequ...

10 years ago | 2 answers | 0

2

answers

Question


how to use a logical array to set logicals result for entire row.
I have a matrix of nrows, with 3 columns. I am looking for an efficient way to use the 3rd column to select which rows i want t...

10 years ago | 0 answers | 0

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answers