narginchk and varargin in MATLAB

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DM
DM on 20 Apr 2015
Answered: James Tursa on 20 Apr 2015
I have come across PART of a code in MATLAB in a toolbox that I don't understand
elseif (txMode==2)
narginchk(7, 7);
numTx = varargin{1};
numRx = varargin{2};
switch numTx
case 2
numCSRRE_RB = 4*2*2;
case 4
numCSRRE_RB = 4*3*2;
end
I don't understand what `narginchk` and `varargin` are used for in this example, and why is that the output of `varargin{1}` would be either 2 or 4 (a conclusion I came up with when looking at the code after `switch`).
Thanks

Answers (1)

James Tursa
James Tursa on 20 Apr 2015
narginchk(7, 7) throws an error if the number of input arguments is less than 7 or greater than 7 (i.e., the number of input arguments must be exactly 7 in this case or an error will be thrown).
varargin{1} is the first input argument.
varargin{2} is the second input argument.
Why the value of varargin{1} should be 2 or 4 would depend on the code in question and how it is called.

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