Jacob Halbrooks

MathWorks

Last seen: 24 días hace | Con actividad desde 2012

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I manage the Mapping and RF Propagation team at MathWorks.

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Extract coordinates from a geopolyshape
You can access latitude-longitude coordinates from a geopolyshape using the geotable2table function. We recognize that there is ...

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How to read modern shapefile data
You can access latitude-longitude coordinates from a geopolyshape using the geotable2table function. We recognize that there is ...

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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...

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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...

más de 3 años hace | 1

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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...

casi 4 años hace | 2

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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...

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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...

alrededor de 4 años hace | 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...

alrededor de 4 años hace | 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...

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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...

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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 ...

casi 5 años hace | 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...

casi 5 años hace | 0

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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...

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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 ...

casi 5 años hace | 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...

casi 5 años hace | 1

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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...

casi 5 años hace | 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...

casi 10 años hace | 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...

casi 10 años hace | 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...

casi 10 años hace | 8

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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...

alrededor de 10 años hace | 0

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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...

alrededor de 10 años hace | 0

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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...

alrededor de 10 años hace | 1

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

alrededor de 10 años hace | 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...

alrededor de 10 años hace | 0

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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...

alrededor de 10 años hace | 0

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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...

alrededor de 10 años hace | 0

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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...

alrededor de 10 años hace | 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>: ...

alrededor de 10 años hace | 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 ...

alrededor de 10 años hace | 0

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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...

alrededor de 10 años hace | 0

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