MATLAB: Can’t I open/find example files that are part of a Support Package

Embedded Coderexamplesfoundinstalledpackagesupport

I am trying to open an example model listed in the documentation for a particular toolbox; the page says the example belongs to a Support Package (or a Hardware Support Package), but when I click the shortcut to open the attached files in MATLAB the files are not recognized, and I get an error indicating the system or file was not found.

How can I resolve this?

Best Answer

Usually this happens when the example files are not installed on not currently located on the MATLAB search path. There are several possible explanations.

1. Check which support packages are currently installed on your machine. For instance, if the support package is properly installed you will see the following:

>> matlabshared.supportpkg.getInstalled 
Name                       Version             Base Product
-----------------------------------------------------------------------
<Support Package Name>     XX.Y.Z              <Base Product Name>

2. Check the location of the Support Package Root Directory using the following commands:

>> matlabshared.supportpkg.getSupportPackageRoot

This should return a location similar to the following:

'C:\ProgramData\MATLAB\SupportPackages\RXXXXy'.

Typically, example files are located somewhere off this directory. They may be located in a sub-directory tied to a particular toolbox or set of examples, such as:

‘C:\ProgramData\MATLAB\SupportPackages\RXXXXy\toolbox\<Toolbox Name>\supportpackages\<Support Package Name>\<examples>’

The "examples" directory typically contains code and/or model files needed to run the examples included with the support package.

Please navigate to the equivalent location on your machine and confirm that the files are located there.

3. If the files do not appear there, please follow the instructions in the following article to re-install the Support Package.

https://www.mathworks.com/matlabcentral/answers/318635-how-do-i-perform-a-clean-re-installation-of-a-support-package

4. Once you have confirmed that the files do exist in that directory, use the 'which' command to identify if the files exist on the MATLAB Path.

>> which example_filename.m

For example, this should return a path location similar to what is shown below:

‘C:\ProgramData\MATLAB\SupportPackages\RXXXXy\toolbox\<Toolbox Name>\supportpackages\<Support Package Name>\<examples>\example_filename.m’

If ‘which’ returns a valid result, the files are on the MATLAB path and you should be able to open and run them successfully.

If not, please add the files to the MATLAB search path; you may need to use the following command to refresh the path before trying to open the files again:

>> addpath(‘C:\ProgramData\MATLAB\SupportPackages\RXXXXy\toolbox\<Toolbox Name>\supportpackages\<Support Package Name>\<examples>’)
>> rehash path

5. In some instances, Support Package examples vary from release to release.

Confirm that the example you are looking for exists in the MATLAB version you are trying to access it from. Refer to the documentation pages for your specific MATLAB version, and confirm that the example appears listed somewhere in the version-specific documentation.

https://www.mathworks.com/help/doc-archives.html

Related Solutions

MATLAB: Do I see a “java.lang.NullPointerException” in the installation log when trying to install a support package

The support package installation folder is not set or cannot be retrieved for some reason. The installation folder is saved in $MATLAB/toolbox/local/supportpackagerootsetting.xml. The file may not exist, not have read permissions or be invalid.

Run the following command to see if any errors are returned:

>> matlabshared.supportpkg.getSupportPackageRoot

Run the following to set an installation folder, then run the above again to verify if the folder was set properly:

>> matlabshared.supportpkg.setSupportPackageRoot('path_to_writable_location')

Replace "path_to_writable_location" with a valid path. Common locations are:

- Windows: C:\ProgramData\MATLAB\SupportPackages\<release>

- Linux: /home/<user>/Documents/MATLAB/SupportPackages/<release>

- Mac: /Users/<user>/Documents/MATLAB/SupportPackages/<release>

Alternatively, setting the contents of supportpackagerootsetting.xml to the following should work on all platforms:

<?xml version="1.0" encoding="UTF-8"?>
<SupportPackageRootSettings>
   <Setting name="sproot">__DEFAULT__</Setting>
</SupportPackageRootSettings>

MATLAB: How to call Cygwin command pipeline with the MATLAB ‘system’ function

Disclaimer: Cygwin is a Linux emulator in Windows. Cygwin is not in the supported platform list. This article is meant as a self-help resource for customers with the similar issues.

In this issue, there are several things to understand to find the right solution:

1. The 'system' function of MATLAB only passes the command to the operating system (OS) and has no control over how the passed command is executed.

2. Installing Cygwin does not grant the OS the knowledge to the counterpart executables of the Linux commands. These executables reside under the 'bin' sub-directory under the Cygwin installation directory.

3. Forward slash ('\') works for Windows shell but not for the Cygwin shell.

4. Two single quotes ('''') do not act as a double quote ('"') in the Windows shell.

5. The semicolon (';') works as a pipeline in Cygwin (or real Linux) but not in a Windows shell.

With the above understanding, the code in the question should be revised as below. The primary change is to include the full paths to each invoked Cygwin commands.

>> clear;
>> cygwinPath = 'C:\cygwin\bin'; % the value depends on the actual installation of Cygwin
>> cw_gzip = fullfile(cygwinPath, 'gzip');
>> cw_sed = fullfile(cygwinPath, 'sed');
>> cw_split = fullfile(cygwinPath, 'split');
>> cw_date = fullfile(cygwinPath, 'date');
>> inputfname = 'input.gz';
>> nlines = 5;
>> outprefix = ''
>> system(cw_date); % separate call to 'date' without using ';' for pipeline separation, which is not supported in Windows
>> pipeline = sprintf(...
>>    ['%s -dc %s | '...
>>     '%s -n \"2p;4~2p\" | ' ...
>>     '%s -a 3 -d -l %d --numeric-suffix=1 --additional-suffix=%s '...
>>     '--filter=\"%s > $FILE.gz\" - %s/file'], ...
>>     cw_gzip, name2, ...
>>     cw_sed, ...
>>     cw_split, nlines, '_r2_callqual.txt', ...
>>     strrep(cw_gzip,'\','/'),...
>>     outdir);
>> system(pipeline);
>> system(cw_date);

Best Answer

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MATLAB: Do I see a “java.lang​.NullPoint​erExceptio​n” in the installation log when trying to install a support package

MATLAB: How to call Cygwin command pipeline with the MATLAB ‘system’ function

Related Question

MATLAB: Do I see a “java.lang.NullPointerException” in the installation log when trying to install a support package