error using ode45 in gui

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pawan kumar
pawan kumar 2011-9-28
while debugging code for flat-fire using ode45 it gives error
err0r:-
??? Error while evaluating uicontrol Callback
??? Error using ==> feval
Undefined function or method 'fnflatfiredragwind' for input
arguments of type 'double'.
Error in ==> guitry>togglebutton1_Callback at 187
[t,c,te,ze,ie] =
ode45('fnflatfiredragwind',tspan,c0,options,w1,w2,w3,k);
??? Error while evaluating uicontrol Callback
*
here is the function defined in toggle button
function togglebutton1_Callback(hObject, eventdata, handles)
v0 = str2num(get(handles.edit1,'string'));
theta = str2num(get(handles.edit2,'string'));
theta = theta*pi/180;
w1 = str2num(get(handles.edit3,'string'));
w2 = str2num(get(handles.edit4,'string'));
w3 = str2num(get(handles.edit5,'string'));
k = str2num(get(handles.edit6,'string'));
set(handles.text1,'string',result);
c0 = [0;v0*cos(theta);0;v0*sin(theta);0;0];
options = odeset('events','on');
tspan = [0 10];
[t,c,te,ze,ie] = ode45('fnflatfiredragwind',tspan,c0,options,w1,w2,w3,k);
what is this error ????????????????
please help me for this
thanks
pawan kumar
  1 个评论
Jan
Jan 2011-9-28
Please use proper code formatting to improve the readability. Follow the "Markup help" link to learn the details.

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回答（4 个）

Grzegorz Knor
Grzegorz Knor 2011-9-28
Replace line:
[t,c,te,ze,ie] = ode45('fnflatfiredragwind',tspan,c0,options,w1,w2,w3,k);
with:
[t,c,te,ze,ie] = ode45(@fnflatfiredragwind,tspan,c0,options,w1,w2,w3,k);
  5 个评论
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pawan kumar
pawan kumar 2011-9-29
i used @fnflatfiredragwind in place of fnflatfiredragwind but now the error is different. now it is not accepting the variable which i am passing through ode45 argument to the function file.
this problem comes only when i am using push-button to run the code. in simple(not from gui).it gives no error.
error :-
??? Input argument "k" is undefined.
Error in ==> guitry>fnflatfiredragwind at 180
value = [c(2); -k*(c(2)-w1)^2; c(4); (-k*(c(2)-w1)*(c(4)-w2))-g;
c(6); -k*(c(2)-w1)*(c(6)-w3)];
Error in ==> odearguments at 109
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,
odeFcn, ...
Error in ==> guitry>togglebutton1_Callback at 210
[t,c,te,ze,ie] =
ode45(@fnflatfiredragwind,tspan,c0,options,w1,w2,w3,k);
function file is
function [value,isterminal,dircn] = fnflatfiredragwind(t,c,flag,w1,w2,w3)
g = 9.8;
% c(1) = x; c(2) = dx/dt = vx ; c(3) = y ; c(4) = dy/dt = vy ; c(5) = w
% c(6) = dc/dt = vz
if nargin<7 || isempty(flag)
value = [c(2); -k*(c(2)-w1)^2; c(4); (-k*(c(2)-w1)*(c(4)-w2))-g; c(6); -k*(c(2)-w1)*(c(6)-w3)];
else
switch flag
case 'events'
value = c(3);
isterminal = 1;
dircn = 0;
otherwise
error('function not programmed for this event');
end
end
Grzegorz Knor
Grzegorz Knor 2011-9-29
You don't pass the k argument to the function. Please correct this line:
function [value,isterminal,dircn] = fnflatfiredragwind(t,c,flag,w1,w2,w3,k)

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Jan
Jan 2011-9-28
The error means, that the file "fnflatfiredragwind.m" cannot be found in the Matlab path and the current directory (see cd). Where is it? Is it a local subfunction? Then Grzegorz's idea of using a function handle might help.
Walter Roberson
Walter Roberson 2011-9-29
Convert
[t,c,te,ze,ie] =
ode45(@fnflatfiredragwind,tspan,c0,options,w1,w2,w3,k);
to
[t,c,te,ze,ie] =
ode45(@(t) fnflatfiredragwind(t,w1,w2,w3,k),tspan,c0,options);
convert
function [value,isterminal,dircn] = fnflatfiredragwind(t,c,flag,w1,w2,w3)
to
function [value,isterminal,dircn] = fnflatfiredragwind(t,c,flag,w1,w2,w3,k)
  2 个评论
pawan kumar
pawan kumar 2011-10-4
now the error is
??? Error using ==> guitry>@(t)fnflatfiredragwind(t,w1,w2,w3,k)
Too many input arguments.
Error in ==> odearguments at 109
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, odeFcn, ...
Error in ==> rr>togglebutton1_Callback at 257
[t,c,te,ze,ie] = ode45(@(t) fnflatfiredragwind(w1,w2,w3,k),tspan,c0,options);
Error in ==> gui_mainfcn at 96
feval(varargin{:});
Error in ==> rr at 42
gui_mainfcn(gui_State, varargin{:});
Error in ==> @(hObject,eventdata)rr('togglebutton1_Callback',hObject,eventdata,guidata(hObject))
??? Error while evaluating uicontrol Callback
please reply me a efficient method so that i can make gui of my programme
Walter Roberson
Walter Roberson 2011-10-4
Correction:
[t,c,te,ze,ie] =
ode45(@(t) fnflatfiredragwind(t,w1,w2,w3,k),tspan,c0,options);
should be
[t,c,te,ze,ie] =
ode45(@(t,c) fnflatfiredragwind(t,c,[],w1,w2,w3,k),tspan,c0,options);

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pawan kumar
pawan kumar 2011-10-10
i tried the above method but still it was giving error but now i got the mistake actually the programme is running using the same code [t,c,te,ze,ie] = ode45('fnflatfiredragwind',tspan,c0,options,w1,w2,w3,k);
but previously the mistake which i was doing is i was displaying sth between button function and variable
function togglebutton1_Callback(hObject, eventdata, handles)
clc
clear all
close all
disp(' ')
v0 = str2num(get(handles.edit1,'string'));
when i remove that the programme executed without error
function togglebutton1_Callback(hObject, eventdata, handles)
thanks
v0 = str2num(get(handles.edit1,'string'));
  2 个评论
Walter Roberson
Walter Roberson 2011-10-10
Any program that has "clear all" in it is 99%+ likely to be broken.
Walter Roberson
Walter Roberson 2011-10-10
Please point me to a reference page or user guide page that shows passing additional variables by placing them after the "options" structure in an ode*() call. I have been unable to find such a page myself; all I have been able to find so far is pages that say specifically that YOU CANNOT DO THAT.

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