Error using==> nargin

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Raphel
Raphel 2011-10-31
编辑： pavitra ramdas 2015-2-12
Hi,
I am a new user to mathlab, and trying to solve 11 simultaneous 1st order differential equation:
Here is the M-file :
funtion dxdt=anu(t,x)
%x(1)=xA, x(2)=xB, x(3)=xC, x(4)=xD, x(5)=xE, x(6)=xF, x(7)=xG, x(8)=xH,
%x(9)=xI, x(10)=xJ, x(11)=xK
global kg ka kb kc kd Z
dxdt=[-kg/Z*(x(2)+x(4)+x(7)+x(10)+x(11)); 1/Z*(kg*x(1)-ka*x(2)); 1/Z*ka*x(2); 1/Z*(kg*x(1)-kb*x(4)); 1/Z*(kb*x(4)-2*kd*x(5)); 1/Z*kd*(x(5)+x(8));1/Z*(kg*x(1)-kc*x(7)); 1/Z*(kc*x(7)-2*kd*x(8)); 1/Z*kd*(x(5)+x(8)); 1/Z*kg*x(1); 1/Z*kg*x(1)];
This is the call function:
>> clf
>> global kg ka kb kc kd Z
>> kg=0.03118;
>> ka=0.0042;
>> kb=0.000083;
>> kc=0;
>> kd=0.00025;
>> Z=4.056*10^-4;
>> tspan=[0:10:240];
>> x0=[1 0 0 0 0 0 0 0 0 0 0];
>> [t,x]=ode45('anu',tspan,x0);
Here is the error i got:
??? Error using ==> nargin
anu is a script.
Error in ==> funfun\private\odearguments at 80
if (nargin(ode) == 2)
Error in ==> ode45 at 173
[neq, tspan, ntspan, next, t0, tfinal, tdir, y0, f0, odeArgs, ...
Somebody please help, i am new to mathlab so please simply.. Thanks

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回答（6 个）

Walter Roberson
Walter Roberson 2011-10-31
Your function anu starts with the word
funtion
which is missing the 'c'.
  1 个评论
Jan
Jan 2011-10-31
After eating a soup with noodles shaped like characters ("Buchstabennudeln"), a friend of mine told me: "Jan, da liegt ein C auf dem Tisch" (there lies a C on the table). It was distusting, because I understood: "da liegt ein Zeh auf dem Tisch" (the lies a toe on the table).
I wish you and all readers a scary halloween.

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Walter Roberson
Walter Roberson 2011-10-31
Earlier in your path, you must have another anu.m file that is a script (no "function" line)
Try
which -all anu
and compare that to the anu that you are expecting to be invoked.
Note: if the anu function that you show above is stored in a file other than anu.m then MATLAB will not be able to find the right file when you pass 'anu' as a quoted string to ode45: passing as a quoted string always forces MATLAB to feval() the name in the base workspace. Using function handles such as @anu is more likely to work in such a situation.
Raphel
Raphel 2011-10-31
Thanks for the quick response, anu was new m-file, i didnt have it earlier. Its stored in anu.m. can you explain how to use @anu??
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Walter Roberson
Walter Roberson 2011-10-31
Note: if there is *any* executable line in anu.m before the "function" line, then the file would be considered a script rather than a function. You need it to be a function.
Dennis
Dennis 2011-10-31
Walter i got the error after following up on your recomendations:
Warning: feval on script names will not work, or may work differently,
in a future version of MATLAB. To make your code insensitive to any change
and to suppress this warning message:
- Either change the script to a function.
- Or use eval instead of feval.
The script file in question is anu.
> In funfun\private\odearguments at 110
In ode45 at 173
??? Attempt to execute SCRIPT anu as a function.
Error in ==> funfun\private\odearguments at 110
f0 = feval(ode,t0,y0,args{:}); % ODE15I sets args{1} to yp0.
Error in ==> ode45 at 173
[neq, tspan, ntspan, next, t0, tfinal, tdir, y0, f0, odeArgs, ...

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Dennis
Dennis 2011-10-31
Hi Walter, When did: [t,x]=ode45(@anu,tspan,x0); i got error: Warning: feval on script names will not work, or may work differently, in a future version of MATLAB. To make your code insensitive to any change and to suppress this warning message: - Either change the script to a function. - Or use eval instead of feval. The script file in question is anu. > In funfun\private\odearguments at 110 In ode45 at 173 ??? Attempt to execute SCRIPT anu as a function.
Error in ==> funfun\private\odearguments at 110 f0 = feval(ode,t0,y0,args{:}); % ODE15I sets args{1} to yp0.
Error in ==> ode45 at 173 [neq, tspan, ntspan, next, t0, tfinal, tdir, y0, f0, odeArgs, ... Please help!
Dennis
Dennis 2011-10-31
Walter, Thank you soo much.. Dennis K
  1 个评论
pavitra ramdas
pavitra ramdas 2015-2-12
编辑：pavitra ramdas 2015-2-12
Did it work? I have the same problem. I executed it as a function and I am still getting the same error

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pavitra ramdas
pavitra ramdas 2015-2-12
编辑：pavitra ramdas 2015-2-12
I have the same problem. I executed it as a function and I am still getting the same error

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