Community Profile # Albert

Last seen: 17 Tage ago Active since 2019

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Question

Border detection out of regular shape
Hi, I have this shape in the plot, but I want to detect the 4 tails sticking out of the square in order to remove them. How coul...

etwa 2 Monate ago | 1 answer | 1

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Question

Regular polygon drawing with number of sides and number of points per side as input
Hello, I want to generate the points that define a regular polygon (a hexagon in my case). I am able to generate the vertices as...

etwa 2 Monate ago | 1 answer | 0

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Question

Cross-correlation maximum in frequency domain
I need to compute the complex cross-correlation between two signals a and b and the take only the maximum value of the cross-cor...

3 Monate ago | 0 answers | 0

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Question

Beamforming algorithms with null steering
Hi! I have an antenna made of N linear elements forming an array (N = 3). I want to compute the steering vector so that the max...

4 Monate ago | 0 answers | 0

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Question

Interleaved repmat (row duplication)
I would like to do a specific repmat such that if I have: a=[1 0 0;0 0 1;1 1 1] I would like to duplicate each row by a value ...

7 Monate ago | 2 answers | 1

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Question

Theta phi positive and negative conventions and conversions
Hi, how can I convert any (theta_i,phi_i) angular coordinate so that it is restricted only to values where theta_i goes from 0º ...

10 Monate ago | 1 answer | 0

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Question

2D circular interpolation (theta, phi) angles
Hi, I have a 2D matrix Z that is function of theta and phi coordinates Z(theta,phi). I have a regular grid of theta and phi coor...

10 Monate ago | 1 answer | 0

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Question

Create polygon with more contour points (not only vertices)
I would like to know how to create e.g. a hexagon with more points over the contourns, instead of having only the points for the...

11 Monate ago | 1 answer | 0

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Question

Find a 4-point polygon enclosing scattered points
I have a set of scattered points (x,y) as in the attached figure and I want to find the polygon defined only by 4 points that en...

12 Monate ago | 2 answers | 0

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Question

Multiple griddata calls into a single one (same grid)
Hi, I'm using griddata to regrid points (xpoint, ypoint, pointval) into a regular grid (xgrid, ygrid). I used to do this in 2D ...

etwa ein Jahr ago | 3 answers | 0

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Question

How to find optimum complex weighting coefficients for antenna beam pattern optimisation? A purely optimisation problem
Hi, I need to optimize antenna pattern weights so that it has a certain value at certain directions. I've seen there is an examp...

etwa ein Jahr ago | 1 answer | 0

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Question

Breaking and spliting vector into groups and averaging
Hi, I have a long one-dimensional time vector that I want to split in chunks and average each chunk. I have another logical vec...

etwa ein Jahr ago | 1 answer | 0

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Question

Antenna Pattern Symmetric Null Steering / Beamforming
Hi! I have an antenna made of N linear elements forming an array (N = 3). I want to compute the steering vector so that the max...

etwa ein Jahr ago | 0 answers | 0

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Antenna Array Factor Null Steering
Have a look at this example: https://es.mathworks.com/help/phased/examples/array-pattern-synthesis.html You can choose one dir...

fast 2 Jahre ago | 0

Question

How to add more nulling directions to Phased array pattern synthesis?
Hi, I'm trying to tune the Matlab example on steering vectors computation for array synthesis nulling on a given direction. The...

fast 2 Jahre ago | 0 answers | 0

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Question

Array points densification without classical interpolation (non-unique solutions)
Hi! I would like to 'densify' the points within an array of x and y points. For instance I would like to turn: size([x y]) =...

etwa 2 Jahre ago | 0 answers | 0

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Multi-variable interpolation, grids and 2D guessing
Thanks very much for the detailed answer. Indeed I realize now that if the problem were linear the solution may be easier. I fir...

etwa 2 Jahre ago | 0

Question

Multi-variable interpolation, grids and 2D guessing
Hi! I have a regular grid of (x,y) points. Each point in turn has an associated value of a range and frequency variable, that m...

etwa 2 Jahre ago | 2 answers | 0