Go to the T4 or T7 Quickstart Tutorial and follow the steps to install LabJack software and confirm basic operation.
Download/extract the .zip file attached at the top of this page.
In MATLAB open, edit and run the script examples in extracted MATLAB_LJM folder.

Note: Add example scripts to the MATLAB path before running, and all examples require the functions in showDeviceInfo.m and showErrorMessage.m.

Refer to the download's README.txt file for more details.

LJM Examples Where Is An Example To Do XYZ (Referencable)

With the LJM library, pretty much everything you might want to do with a device is accomplished by writing and/or reading some registers. Look at the device's datasheet (T7 or T4) or the Modbus Map to determine what registers you need to write and read, then use eWriteName (or eWriteNames) to write the desired registers and eReadName (or eReadNames) to read the desired registers. The following examples in the Basic folder are a great place to start:

LJM_eWriteName Example
LJM_eWriteNames Example
LJM_eReadName Example
LJM_eReadNames Example
Write Read Loop with Config

Where is an example to do XYZ?

You will find lots of examples in this archive, but there is not an example for everything the LabJack can do. The reason for this stems from the "Overview" section above. Most operations simply involve writing and reading different registers, so you really just need examples that show you how to write and read any register. If we had examples for every operation, they would just be copies of the example "Write Read Loop with Config" with different registers. The typical workflow to do almost anything beside stream is:

Look at the T-series Datasheet or the Modbus Map to determine what registers you need to write and read.
Use the Register Matrix in Kipling to test writing and reading your desired registers and confirm you see what you expect to see. This step is optional and not always applicable.
Use eWriteName (or eWriteNames) to write the desired registers and eReadName (or eReadNames) to read the desired registers. Or just use "Write Read Loop with Config", which provides the basic structure used by many user applications.

Stream mode and other operations that don't fit in "Write Read Loop with Config" will usually have specific examples, and if something seems to be missing let us know.

LJM MATLAB Examples Bottom (Referencable)

Code Snippet

%Make the LJM .NET assembly visible in MATLAB
ljmAsm = NET.addAssembly('LabJack.LJM');

handle = 0;

try
    %Open first found LabJack
    [ljmError, handle] = LabJack.LJM.OpenS('ANY', 'ANY', 'ANY', handle);
    
    %Call eReadNames to read the serial number from the LabJack.
    name = 'SERIAL_NUMBER';
    [ljmError, value] = LabJack.LJM.eReadName(handle, name, 0);
    
    disp('eReadName result:')
    disp(['  ' name ' = ' num2str(value)])
catch e
    showErrorMessage(e)
end

File list

MATLAB_LJM_2017_12_04.zip contains:

LICENSE.txt
README.txt
Examples\getDeviceType.m
Examples\showDeviceInfo.m
Examples\showErrorMessage.m
Examples\Basic\eAddresses.m
Examples\Basic\eNames.m
Examples\Basic\eReadAddress.m
Examples\Basic\eReadAddresses.m
Examples\Basic\eReadName.m
Examples\Basic\eReadNames.m
Examples\Basic\eWriteAddress.m
Examples\Basic\eWriteAddresses.m
Examples\Basic\eWriteName.m
Examples\Basic\eWriteNames.m
Examples\More\AIN\DualAINLoop.m
Examples\More\AIN\SingleAIN.m
Examples\More\AIN\SingleAINWithConfig.m
Examples\More\Config\ReadConfig.m
Examples\More\Config\ReadDeviceNameString.m
Examples\More\Config\WriteDeviceNameString.m
Examples\More\Config\WritePowerConfig.m
Examples\More\DIO\SingleDIORead.m
Examples\More\DIO\SingleDIOWrite.m
Examples\More\Ethernet\ReadEthernetConfig.m
Examples\More\Ethernet\ReadEthernetMac.m
Examples\More\Ethernet\WriteEthernetConfig.m
Examples\More\I2C\I2CEeprom.m
Examples\More\ListAll\ListAll.m
Examples\More\SPI\SPI.m
Examples\More\Stream\StreamBasic.m
Examples\More\Stream\StreamBasicWithStreamOut.m
Examples\More\Stream\StreamBurst.m
Examples\More\Stream\StreamSequentialAIN.m
Examples\More\Testing\CRSpeedTest.m
Examples\More\Watchdog\ReadWatchdogConfig.m
Examples\More\Watchdog\WriteWatchdogConfig.m
Examples\More\WiFi\ReadWiFiConfig.m
Examples\More\WiFi\ReadWiFiMac.m
Examples\More\WiFi\ReadWiFiRssi.m
Examples\More\WiFi\WriteWiFiConfig.m