Understanding the coding in Matlab

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Hi I am having a challenge trying to understand the following code!!
Can a professional explain this for me please? It maybe simple but i need to get this asap!
I am constantly seeing this and its a tad difficult to understand!
Oh! and if you can point me in the direction to do some reading on this it will be immensly apprecited!
Thanks in advance for acknowledging my request!
t=mean(gbd(:));

Accepted Answer

Star Strider
Star Strider on 1 Jul 2019
This line:
t=mean(gbd(:));
converts ‘gbd’ (that is likely a matrix) into a column vector, and then takes the mean of the vector. Most functions in MATLAB that can have matrix arguments require a specific dimension to calculate the result (here, mean) although 'all' is available in the last two releases. Creating a column vector using the (:) subscript convention takes the mean of the entire matrix, avoiding the need to do two nested mean calls.

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