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glgjw

Òø³æ (СÓÐÃûÆø)

[ÇóÖú] matlabÇó´øÊ¼þµÄ΢·Ö·½³Ì×ܳö´í ÒÑÓÐ1È˲ÎÓë

>> opts=odeset('events',@lift)
>> [t,y,timeend]=ode45('mass1',[0 10],[0;0],opts)
ÉÏÃæµÄº¯ÊýliftºÍmass1±àдÈçÏ£º
º¯Êýlift£º
>> function[value,isterminal,direction]=lift(t,y)
value=160.5*y(1)+448*t-75
isterminal=1
direction=[]
º¯Êýmass1£º
function dy=mass1(t,y)
dy=[y(2);(4.48*10^6*8*t/15/(6-y(1))-(7.35*10^6+4.48*10^6/(6-y(1)))*y(1)-17.785*10^3*y(2))/4080]

ÔËÐкóµÄ³ö´íÐÅÏ¢£º
dy =

     0
     0

??? Function 'lower' is not defined for values of class 'function_handle'.

Error in ==> lower at 26
  [varargout{1:nargout}] = builtin('lower', varargin{:});

Error in ==> funfun\private\odeevents at 32
  switch lower(eventFcn)

Error in ==> ode45 at 209
[haveEventFcn,eventFcn,eventArgs,valt,teout,yeout,ieout] = ...

º¯Êýmass1¿Ï¶¨Ã»ÓдíÎ󣬴ó¼Ò¼ì²éÆäËûµÄ²¿·Ö¼´¿É¡£Ð»Ð»£¡
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» ²ÂÄãϲ»¶

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glgjw

Òø³æ (СÓÐÃûÆø)

ÒýÓûØÌû:
7Â¥: Originally posted by wurongjun at 2016-02-18 11:48:11
ÎÒµÄÒѾ­ÔËÐÐÀ²!½á¹ûÌùÔÚÉÏÃæ!
Äã°Ñ³ö´íÌáʾ·¢ÉÏÀ´¿´¿´!...

Äú¿´¿´£º
>> [t,y]=ode45(@mass1,[0 10],[0;0],options)

dy =

     0
     0

??? Error: File: d:\MATLAB7\work\lift.m Line: 1 Column: 1
Missing variable or function.

Error in ==> funfun\private\odeevents at 29
  eventValue = feval(eventFcn,t0,y0,eventArgs{:});   

Error in ==> ode45 at 209
[haveEventFcn,eventFcn,eventArgs,valt,teout,yeout,ieout] = ...

ºÃÏñ˵lift.mµÚÒ»ÐеÚÒ»ÁÐȱ±äÁ¿£¬Ò²²»È±°¡¡£
8Â¥2016-02-18 11:55:10
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
²é¿´È«²¿ 9 ¸ö»Ø´ð
2Â¥2016-02-17 22:39:49
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

wurongjun

ר¼Ò¹ËÎÊ (Ö°Òµ×÷¼Ò)

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

¸Ðл²ÎÓ룬ӦÖúÖ¸Êý +1
Ò»µãµãÎÊÌâ!
¼òµ¥ÐÞ¸ÄÈçÏÂ!
opts=odeset('events',@lift);
[t,y,timeend]=ode45(@mass1,[0 10],[0;0],opts)
function[value,isterminal,direction]=lift(t,y)
value=160.5*y(1)+448*t-75;
isterminal=1;
direction=[];
function dy=mass1(t,y)
dy=[y(2);(4.48*10^6*8*t/15/(6-y(1))-(7.35*10^6+4.48*10^6/(6-y(1)))*y(1)-17.785*10^3*y(2))/4080];
ÔËÐнá¹ûÈçÏÂ:
>>
t =

         0
    0.0040
    0.0080
    0.0120
    0.0160
    0.0200
    0.0240
    0.0280
    0.0320
    0.0367
    0.0415
    0.0463
    0.0510
    0.0562
    0.0614
    0.0666
    0.0718
    0.0773
    0.0828
    0.0884
    0.0939
    0.1005
    0.1070
    0.1136
    0.1202
    0.1246
    0.1291
    0.1336
    0.1380
    0.1425
    0.1470
    0.1514
    0.1559
    0.1581
    0.1603
    0.1625
    0.1648


y =

         0         0
    0.0000    0.0008
    0.0000    0.0030
    0.0000    0.0067
    0.0001    0.0117
    0.0001    0.0177
    0.0002    0.0247
    0.0003    0.0322
    0.0005    0.0402
    0.0007    0.0499
    0.0009    0.0593
    0.0012    0.0681
    0.0016    0.0759
    0.0020    0.0828
    0.0024    0.0879
    0.0029    0.0907
    0.0034    0.0913
    0.0039    0.0896
    0.0044    0.0854
    0.0048    0.0792
    0.0052    0.0713
    0.0057    0.0606
    0.0060    0.0492
    0.0063    0.0382
    0.0065    0.0283
    0.0067    0.0228
    0.0067    0.0184
    0.0068    0.0152
    0.0069    0.0135
    0.0069    0.0132
    0.0070    0.0143
    0.0071    0.0168
    0.0072    0.0205
    0.0072    0.0227
    0.0073    0.0252
    0.0073    0.0278
    0.0074    0.0307


timeend =

    0.1648

>>
ÉÆ¶ñµ½Í·ÖÕÓб¨,È˼äÕýµÀÊDz×É£.
3Â¥2016-02-18 09:54:32
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

glgjw

Òø³æ (СÓÐÃûÆø)

ÒýÓûØÌû:
3Â¥: Originally posted by wurongjun at 2016-02-18 09:54:32
Ò»µãµãÎÊÌâ!
¼òµ¥ÐÞ¸ÄÈçÏÂ!
opts=odeset('events',@lift);
=ode45(@mass1,,,opts)
function=lift(t,y)
value=160.5*y(1)+448*t-75;
isterminal=1;
direction=[];
function dy=mass1(t,y)
dy=;
ÔËÐнá¹ûÈç ...

ÇëÎÊÄú¾ÍÊǰÑ'mass1'¸ÄΪ@mass1ÁËÂð£¿ÎÒ֮ǰҲÕâô¸Ä¹ý£¬µ«»¹ÊdzöÏÖͬÑùµÄ´íÎó¡£Çë´Í½Ì£¡

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