Re: matlab nargin() function alternative in octave?

[taltman]

This looks like it can be handled using 'varargin'. It can allow your
function to accept a variable number of arguments. You'll just have to
do some variable type-checking.

HTH,

~Tomer



On Jan 20, 2004 at 10:04am, Sharene Bungay wrote:

sbunga >Date: Tue, 20 Jan 2004 10:04:44 -0500 (EST)
sbunga >From: Sharene Bungay <address@hidden>
sbunga >To: John W. Eaton <address@hidden>
sbunga >Cc: address@hidden
sbunga >Subject: Re: matlab nargin() function alternative in octave?
sbunga >Resent-Date: Tue, 20 Jan 2004 09:04:48 -0600
sbunga >Resent-From: address@hidden
sbunga >
sbunga >Hi, thanks for your reply.
sbunga >I believe it can only accept string arguments under matlab.
sbunga >An example is as follows: Lets assume that I define
sbunga >an algorithm that uses regression as one of its steps.
sbunga >I code the algorithm to call reg(x1,x2,...) with the
sbunga >correct number of arguments. reg() in turn is conditionally
sbunga >defined to take either say, 2 or 3 arguments, depending
sbunga >on some user-set parameter. I could then have my algorithm
sbunga >test something like:
sbunga >
sbunga >if (nargin('reg')==3)
sbunga >        sigma=0.001;
sbunga >        reg(x1,x2,sigma);
sbunga >else
sbunga >        reg(x1,x2);
sbunga >end
sbunga >
sbunga >Now if I were coding this, I would probably just have a global
sbunga >flag something like:
sbunga >
sbunga >if (userselect==reg1)
sbunga >        regfunc1(x1,x2,sigma);
sbunga >else
sbunga >        regfunc2(x1,x2);
sbunga >end
sbunga >
sbunga >But unfortunately, I need to use existing code that makes
sbunga >use of the nargin('string') functionality.
sbunga >
sbunga >TIA.
sbunga >Sharene.
sbunga >
sbunga >On Mon, 19 Jan 2004, John W. Eaton wrote:
sbunga >
sbunga >> On 19-Jan-2004, Sharene Deanne Bungay <address@hidden> wrote:
sbunga >> 
sbunga >> | I have some matlab code that I would very much like
sbunga >> | to use under octave. Unfortunately, the matlab code
sbunga >> | relies on matlab's ability to pass a function as an
sbunga >> | argument to nargin ( eg. nargin('sin')) and have it return
sbunga >> | the number of arguments expected by that function.
sbunga >> | I know that under octave, nargin is only a local scope scalar
sbunga >> | valid inside a given function, but does there exist a means
sbunga >> | under octave to get the number of expected arguments to a function
sbunga >> | (outside the scope of that function)?
sbunga >> | 
sbunga >> | (This functionality is required since I have functions that are
sbunga >> | conditionally defined to take different arguments, and subsequent
sbunga >> | behaviour requires knowledge of the number of arguments. Rewriting
sbunga >> | the code to use global variables instead of relying on the form of
sbunga >> | the function definitions would be too extensive, so any help
sbunga >> | on this matter would be *GREATLY* appreciated.)
sbunga >> 
sbunga >> Can you post an actual example that uses this functionality so we can
sbunga >> see how you are using it and why it is needed?
sbunga >> 
sbunga >> The Matlab documentation shows that nargin and nargout may accept
sbunga >> string arguments.  Are function handles also allowed?
sbunga >> 
sbunga >> Thanks,
sbunga >> 
sbunga >> jwe
sbunga >> 
sbunga >
sbunga >
sbunga >
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