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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»¶

ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
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£¡

·¢×ÔСľ³æAndroid¿Í»§¶Ë
4Â¥2016-02-18 11:04:42
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

wurongjun

ר¼Ò¹ËÎÊ (Ö°Òµ×÷¼Ò)

ÒýÓûØÌû:
4Â¥: Originally posted by glgjw at 2016-02-18 11:04:42
ÇëÎÊÄú¾ÍÊǰÑ'mass1'¸ÄΪ@mass1ÁËÂð£¿ÎÒ֮ǰҲÕâô¸Ä¹ý£¬µ«»¹ÊdzöÏÖͬÑùµÄ´íÎó¡£Çë´Í½Ì£¡
...

ÊǵÄ!
ÉÆ¶ñµ½Í·ÖÕÓб¨,È˼äÕýµÀÊDz×É£.
5Â¥2016-02-18 11:16:38
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

glgjw

Òø³æ (СÓÐÃûÆø)

ÒýÓûØÌû:
5Â¥: Originally posted by wurongjun at 2016-02-18 11:16:38
ÊǵÄ!...

ÄÇ»¹ÊÇͬÑùµÄ´íÎóѽ£¡ÎÒÓõÄÊÇMATLAB7

·¢×ÔСľ³æAndroid¿Í»§¶Ë
6Â¥2016-02-18 11:40:08
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

wurongjun

ר¼Ò¹ËÎÊ (Ö°Òµ×÷¼Ò)

ÒýÓûØÌû:
6Â¥: Originally posted by glgjw at 2016-02-18 11:40:08
ÄÇ»¹ÊÇͬÑùµÄ´íÎóѽ£¡ÎÒÓõÄÊÇMATLAB7
...

ÎÒµÄÒѾ­ÔËÐÐÀ²!½á¹ûÌùÔÚÉÏÃæ!
Äã°Ñ³ö´íÌáʾ·¢ÉÏÀ´¿´¿´!
ÉÆ¶ñµ½Í·ÖÕÓб¨,È˼äÕýµÀÊDz×É£.
7Â¥2016-02-18 11:48:11
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

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

wurongjun

ר¼Ò¹ËÎÊ (Ö°Òµ×÷¼Ò)

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï
glgjw: ½ð±Ò+20, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸, ¸ÐлÈÈÇé°ïÖú£¡£¡ 2016-02-18 20:58:16
Äã°ÑÏÂÃæ´úÂë×öÒ»¸öеÄmÎļþ,ÔËÐÐÏÂ
function cs
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];
ÉÆ¶ñµ½Í·ÖÕÓб¨,È˼äÕýµÀÊDz×É£.
9Â¥2016-02-18 15:25:36
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
Ïà¹Ø°æ¿éÌø×ª ÎÒÒª¶©ÔÄÂ¥Ö÷ glgjw µÄÖ÷Ìâ¸üÐÂ
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