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From: us on 9 Feb 2010 06:45
"mat001 " <priya.biomath(a)gmail.com> wrote in message <hkrfu3$mlf$1(a)fred.mathworks.com>...
> error occurs
> ??? SWITCH expression must be a scalar or string constant.

well... is that not clear enough(?)...
- correct your input arg #3...

us
From: Parker on 9 Feb 2010 06:54
On 2月9日, 上午11时10分, "mat001 " <priya.biom...(a)gmail.com> wrote:
> function Aijk = Prob(i, j, k, parameter, varargin)
> if ((i == eq.n1) & (j == eq.n1) & (k == eq.n1))
>   switch varargin{3} % what is means ?
>    case 'x'
>     Aijk =
>    case 'y'
>     Aijk =
>     case 'z'
>    Aijk =
>    otherwise
>     error('unknown case');
>   end
> else
>   error();
> end
>
> return
>
> Parker little more explain plz.

according to the 'function Aijk = Prob(i, j, k, parameter, varargin)
' ,
varargin should be a cell array contain several elements
the switch statement will check the third element of varargin and
assign the output or raise an error based on the Value of it.
From: mat001 on 9 Feb 2010 07:10
Parker <xenoszh(a)gmail.com> wrote in message <e54d1809-c0c2-4d20-be5c-9a432d501bdc(a)3g2000yqn.googlegroups.com>...
> On 2&#26376;9&#26085;, &#19978;&#21320;11&#26102;10&#20998;, "mat001 " <priya.biom...(a)gmail.com> wrote:
> > function Aijk = Prob(i, j, k, parameter, varargin)
> > if ((i == eq.n1) & (j == eq.n1) & (k == eq.n1))
> >   switch varargin{3} % what is means ?
> >    case 'x'
> >     Aijk =
> >    case 'y'
> >     Aijk =
> >     case 'z'
> >    Aijk =
> >    otherwise
> >     error('unknown case');
> >   end
> > else
> >   error();
> > end
> >
> > return
> >

> > Parker little more explain plz.
>
> according to the 'function Aijk = Prob(i, j, k, parameter, varargin)
> ' ,
> varargin should be a cell array contain several elements
> the switch statement will check the third element of varargin and
> assign the output or raise an error based on the Value of it.



Thanks for explanation.......
so to call this function

if I say

test1 = Prob(i, j, k, parameter, [],[],'x')

so it will give case 'x'

or if

test2 = Prob(i, j, k, parameter, [],[],'y')

so it will give case 'y'
and similarly for z
From: Oleg Komarov on 9 Feb 2010 07:34
"mat001 "
> Parker
> > On 2&#26376;9&#26085;, &#19978;&#21320;11&#26102;10&#20998;, "mat001 " <priya.biom...(a)gmail.com> wrote:
> > > function Aijk = Prob(i, j, k, parameter, varargin)
> > > if ((i == eq.n1) & (j == eq.n1) & (k == eq.n1))
> > >   switch varargin{3} % what is means ?
> > >    case 'x'
> > >     Aijk =
> > >    case 'y'
> > >     Aijk =
> > >     case 'z'
> > >    Aijk =
> > >    otherwise
> > >     error('unknown case');
> > >   end
> > > else
> > >   error();
> > > end
> > >
> > > return
> > >
>
> > > Parker little more explain plz.
> >
> > according to the 'function Aijk = Prob(i, j, k, parameter, varargin)
> > ' ,
> > varargin should be a cell array contain several elements
> > the switch statement will check the third element of varargin and
> > assign the output or raise an error based on the Value of it.
>
>
>
> Thanks for explanation.......
> so to call this function
>
> if I say
>
> test1 = Prob(i, j, k, parameter, [],[],'x')
>
> so it will give case 'x'
>
> or if
>
> test2 = Prob(i, j, k, parameter, [],[],'y')
>
> so it will give case 'y'
> and similarly for z

You may find useful to read the documentation about debugging.
http://www.mathworks.com/support/tech-notes/1200/1207.html

Oleg
From: Parker on 9 Feb 2010 07:37
On 2月9日, 下午12时10分, "mat001 " <priya.biom...(a)gmail.com> wrote:
> Parker <xeno...(a)gmail.com> wrote in message <e54d1809-c0c2-4d20-be5c-9a432d501...(a)3g2000yqn.googlegroups.com>...
> > On 2&#26376;9&#26085;, &#19978;&#21320;11&#26102;10&#20998;, "mat001 " <priya.biom...(a)gmail.com> wrote:
> > > function Aijk = Prob(i, j, k, parameter, varargin)
> > > if ((i == eq.n1) & (j == eq.n1) & (k == eq.n1))
> > >   switch varargin{3} % what is means ?
> > >    case 'x'
> > >     Aijk =
> > >    case 'y'
> > >     Aijk =
> > >     case 'z'
> > >    Aijk =
> > >    otherwise
> > >     error('unknown case');
> > >   end
> > > else
> > >   error();
> > > end
>
> > > return
>
> > > Parker little more explain plz.
>
> > according to the 'function Aijk = Prob(i, j, k, parameter, varargin)
> > ' ,
> > varargin should be a cell array contain several elements
> > the switch statement will check the third element of varargin and
> > assign the output or raise an error based on the Value of it.
>
> Thanks for explanation.......
> so to call this function
>
> if I say
>
> test1 = Prob(i, j, k, parameter, [],[],'x')
>
> so it will give case 'x'
>
> or if
>
> test2 =  Prob(i, j, k, parameter, [],[],'y')
>
> so it will give case 'y'
> and similarly for z

varargin is a cell array,try use { } to declare it as a cell array
like:
> test2 = Prob(i, j, k, parameter, {[],[],'y'})
=========================================
it should be OK
here is my test

function out = tryCell(i,j,k,varargin)
out = length(varargin);
switch varargin{3}
case 'x'
out = 'x';
case 'y'
out = 'y';
case 'z'
out = 'z';
otherwise
error('error');
end
end

test as
>> tryCell(1,2,3,1,2,'x')
ans =
x
>> tryCell(1,2,3,1,2,'y')
ans =
y
>> tryCell(1,2,3,1,2,'z')
ans =
z
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