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Help to avoid the eval() function

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Yunhui Zhou
Yunhui Zhou on 5 Nov 2016
Edited: John D'Errico on 5 Nov 2016
I currently have problem using the feval() function to replace the eval() function.
The user will input a string array "function_name", which is the name of the function_name.m file; and a cell array "varargin", in which each cell is an input argument for the function_name.m file. The number of cells in "varargin" can't be determined.
Currently I'm using a for-loop to generate a string "function_name(varargin{1},varargin{2},...)", and then using the eval() function to execute the string, and it works. However, I wish to replace the eval() function with feval() function, but it seems hard to transfer all the input arguments. Is it possible to do the replacement?

Answers (3)


Guillaume
Guillaume on 5 Nov 2016
feval(function_name, varargin{:})
Will call the function with however many arguments are stored in varargin.

John D'Errico
John D'Errico on 5 Nov 2016
Edited: John D'Errico on 5 Nov 2016
Easy, peasy:
y = feval(fun,varargin{:});
The {:} makes a cell array (i.e., varargin) into what is called a comma separated list,exactly what feval needs. This is how you expand a cell array into an argument list.

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