CODEWITHSUNDEEP
matlab
lola
lola

Reputation: 5789

call matlab function without all its arguments

function y = myFunc(tR,mode)

if ~isfield(tR, 'isAvailable')
    tR.isAvailable= false;
end

if tR.isAvailable
y = fullfile(workingFolder,'file.txt');
else
y = '';

switch(mode)
case '1'
.....    
case '2'
.....
end
end

when I call myFunc(tR,'1') it'es OK but I would also to be able to call myFunc sometimes without the mode just myFunc(tR)

how could I say in some cases within the function myFunc don't execute the switch case when the mode varaible isn't provided in arguments ?

Upvotes: 2

Views: 232

Answers (4)

Dennis Jaheruddin
Dennis Jaheruddin

Reputation: 21563

  1. The use of exist is probably the neatest and simplest way to do this if you want to exclude elements 'at the end', though nargin can also do the trick. In general I would use nargin if variables have meaningfull positions or no meaningfull names, and exist only if they have meaningfull names. See this question for more about this choice.

  2. The use of varargin is probably the neatest way to do this if you want to exclude elements in general.

  3. However, if you just want to exclude 1 element in the middle, a simple alternative would be:

If you don't want to use the mode, give it as [], then you put your switch statement inside this:

if ~isempty(mode)
    % Your switch statement here
end

Of course the risk is that strange things will happen if you forget to use the if statement later in the same function.

Upvotes: 1

Mohsen Nosratinia
Mohsen Nosratinia

Reputation: 9864

The answer by Dennis Jaheruddin gives a good list of possibilities, but I also find using exist a useful method:

if exist('mode', 'var')
    % Your switch statement here
end

Upvotes: 2

am304
am304

Reputation: 13886

Use nargin in your function to provide some defaults inputs when not enough inputs are provided by the user.

Upvotes: 2

DasKrümelmonster
DasKrümelmonster

Reputation: 6060

You can use varargin, but you need to access the parameters differently then. Also, check with nargin how many arguments you've got.

http://www.mathworks.de/de/help/matlab/ref/varargin.html

Your function declaration would read:

function y = myFunc(tR, varargin)

Upvotes: 0

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