Specify Number of Input or Output Arguments to Entry-Point Functions

If your MATLAB® code takes more inputs or produces more outputs than you want to appear in the generated code, you can instruct the code generator not to generate code for the unneeded arguments.

Control Number of Input Arguments

Consider these functions, both of which support a flexible number of input arguments:

function [x,y] = myops1(varargin) %#codegen
if (nargin > 1)
    x = varargin{1}+varargin{2};
    y = varargin{1}*varargin{2};
else
    x = varargin{1};
    y = -varargin{1};
end
function [x,y] = myops2(a,b) %#codegen
if (nargin > 1)
    x = a+b;
    y = a*b;
else
    x = a;
    y = -a;
end

To generate a function that takes only one argument, provide one argument to fiaccel by using -args.

fiaccel myops1 -args {fi(3, 1, 16, 13)} -report
fiaccel myops2 -args {fi(3, 1, 16, 13)} -report

Control Number of Output Arguments

When you use fiaccel, you can specify the number of output arguments by using the -nargout option.

Consider these functions:

function varargout = myops3(a,b) %#codegen
varargout{1} = a+b;
varargout{2} = a*b;
varargout{3} = a/b;
varargout{4} = a-b;
end
function [output1,output2,output3,output4] = myops4(a,b) %#codegen
output1 = a+b;
output2 = a*b;
output3 = a/b;
output4 = a-b;
end

To generate a function that outputs only one argument, specify one output argument by using the -nargout option with the fiaccel function.

fiaccel myops3 -args {fi(3,1,16,13),fi(3,1,16,13)} -nargout 1 -report
fiaccel myops4 -args {fi(3,1,16,13),fi(3,1,16,13)} -nargout 1 -report

See Also

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