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# Albert

Last seen: 5 giorni ago Active since 2019

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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 ...

22 giorni 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 ...

4 mesi 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...

4 mesi 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...

5 mesi 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...

6 mesi 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 ...

7 mesi 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...

9 mesi 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...

9 mesi 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...

9 mesi 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...

oltre un anno 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...

oltre un anno 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]) =...

oltre un anno 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...

oltre un anno 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...

oltre un anno ago | 2 answers | 0