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Jacob Halbrooks


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MathWorks

107 total contributions since 2012

I manage the Mapping and RF Propagation team at MathWorks.

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Answered
Vertical Distance from Single Coordinate
You can query the ground elevation of a txsite or rxsite location using the elevation function. This returns ground elevation as...

5 months ago | 0

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Answered
How to fix "Out of memory" error
This is likely due to a mismatch between the resonant frequency of the default cavityCircular antenna and the transmitter freque...

5 months ago | 1

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Answered
How can I get the signal strength for individual rays when I do the ray tracing?
As of R2020a you can call raytrace with an output argument to programmatically access each ray's geometry and propagation charac...

9 months ago | 1

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Longley-Rice propagation values
The output of sigstrength does correspond to the absolute signal strength received. By default the signal strength "Type" is "po...

11 months ago | 0

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How do I plot a 2D powermap for SignalStrength calculated bwtween two plot in a graph using imagesc
A new feature is available in R2020a to support importing and visualizing propagation data like this. The feature is available i...

11 months ago | 0

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Plotting latitude, longitude,and signal strength
A new feature is available in R2020a to support importing and visualizing propagation data like this. The feature is available i...

11 months ago | 0

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Is longley-rice the reason it is taking ages to generate a coverage map?
The trouble with the code is a mismatch between the antenna dimensions and the transmitter frequency. The default design frequen...

1 year ago | 2

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Answered
The RF propagation toolbox has SINR function that is used to calculate and display an SINR map, I just want the SINR values and don't want it to be displayed
UPDATE: As of R2020a, the sinr function now supports returning output values when provided transmitter site inputs: pd = sinr(t...

1 year ago | 0

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Answered
Copy SiteViewrer custom terrain data from one computer to another.
There is no mechanism to copy custom terrain data that has been processed for Site Viewer from one machine to another. You will ...

1 year ago | 0

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RF Propagation: Site Viewer
I can run the code you provided but do not encounter an error. The coverage map that results depends on whether the MATLAB relea...

2 years ago | 0

Answered
Coverage map for Base station signal strength
The difference in coverage maps between the example and your results in R2017b is due to the usage of terrain data that was adde...

2 years ago | 0

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Answered
How does MATLAB compute coverage of the antenna?
The default terrain data that is used to generate coverage maps is derived from the USGS GMTED2010 data set, which includes the ...

2 years ago | 0

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Plotting coverage of an LTE base station
Hi Mark, I realize it has been a while since you posted your question. However, I wanted to make you aware that the R2018b versi...

2 years ago | 0

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Coverage map with custom antenna
The txsite and rxsite objects work with any antenna element or array objects from Antenna Toolbox or Phased Array System Toolbox...

2 years ago | 1

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Can I call a class function from Simulink?
I'd suggest you take a look at the MATLAB System block, which is designed to support System objects in Simulink. System objects...

6 years ago | 1

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Dynamically specify namespace/package
A few pieces of documentation explain the behavior where the import list for the function does not update. From the <http://www...

6 years ago | 0

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How to efficiently use dependent properties if dependence is computational costly?
I would recommend you add a method to compute and update the value of your dependent property and then call that method from the...

7 years ago | 5

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Answered
Saving current progam folder path
It looks like you want to write a string to the text file, but SAVE is not a good fit for this. The help for SAVE -ASCII explai...

7 years ago | 0

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Answered
Please help write a script to display the first line of this text file using fgetl
You just need to use FOPEN to create a file handle, and then each call to FGETL on that handle will read a line of text. Here's...

7 years ago | 0

Answered
Can't get Matlab compiler and loadlibrary to work
I suspect the correct reference page is <http://www.mathworks.com/help/compiler/matlab-library-loading.html here> (I'll report t...

7 years ago | 1

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Answered
how to download data from websites?
MATLAB supports importing data from OPenDAP sources <http://www.mathworks.com/help/matlab/import_export/importing-network-common...

7 years ago | 0

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How to read Simulink inputs from Matlab ?
This error suggests that you are not using a data format that the block supports. See the Specifying the Workspace Data section...

7 years ago | 0

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Answered
Debug and workspace of functions
Each function has its own separate workspace of variables, and you do not typically get visibility of the variables outside of y...

7 years ago | 0

Answered
How can I arrange (collect) values for a couple of variables into a table outside "for loop" ?
This looks like a good use case for the <http://www.mathworks.com/help/matlab/ref/table.html TABLE> function in MATLAB. You can...

7 years ago | 0

Answered
How to use vision.X functions in simulink?
From <http://www.mathworks.com/help/dsp/gs/use-system-objects-in-simulink.html Using System objects> in Simulink: You can in...

7 years ago | 0

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how to concatanate structures of different sizes?
From the doc for <http://www.mathworks.com/help/matlab/matlab_prog/concatenate-structures.html concatenating structures>: ...

7 years ago | 0

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How can I fetch values from 2 vectors of numbers without without changing their format.
You can control how MATLAB displays your data using FORMAT. This is independent of how MATLAB actually stores and handles your ...

7 years ago | 0

Answered
how do you combine character array and a row vector
You can use STRVCAT to add a row to your char matrix: >> strvcat(names, numbers) ans = ellen bobby joe...

7 years ago | 0

Answered
Help on creating structures??
You could enter your data into a two-column cell array and then use CELL2STRUCT: data = {'Krista', [10 5 1993]; ... ...

7 years ago | 0

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Answered
EngWinDemo Starts a New Instance?!
I suspect the issue is in trying to have the non-admin privileged engwindemo.exe connect to the admin privileged MATLAB process....

7 years ago | 0

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