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379631818

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f(x)*e^(3*x)+f(x)*e^(5*x)+f(x)*e^(7*x)+¡­¡­+f(x)*e^(41*x)
ͬʱÓÖÖªµÀf(x)*e^(a*x)=f(x+a),
ÇëÎÊÈçºÎ²Ù×÷£¬¿ÉÒÔÈñí´ïʽµÄºÍΪ£ºf(x+3)+f(x+5)+f(x+7)+¡­¡­+f(x+41)
лл£¡
ÆäʵÕâÀïaÊÇÈÎÒâÒ»¸öÊýÖµ£¬ÌâÄ¿µÄÒªÇóÊǽ«ÈÎÒ⺯Êýf(x)*e^(a*x)ÅúÁ¿×ª»¯Îªf(x+a), º¯Êýf(x)ÊÇÒ»¸ö±È½Ï¸´ÔÓµÄʽ×Ó

[ Last edited by 379631818 on 2010-5-23 at 14:58 ]
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379631818

Ìú¸Ëľ³æ (ÖøÃûдÊÖ)

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2Â¥2010-05-22 10:59:32
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

lijinfeng042

ľ³æ (СÓÐÃûÆø)

Matlab

¡ï
robert2020(½ð±Ò+1):¹ÄÀøÓ¦Öú¡£»¶Ó­³£À´·ÂտģÄâ°æ½»Á÷¡£ 2010-05-22 22:39:05
f(x)*e^(3*x)+f(x)*e^(5*x)+f(x)*e^(7*x)+¡­¡­+f(x)*e^(41*x)
Õâ¸ö±í´ïʽµ±×÷×Ö·û´®ÓÃÕýÔò´¦Àí ÔÚ¾­¹ý×Ö·û´®ÔËËã×éºÏ³ÉÄãÐèÒªµÄÑù×Ó µ«ÊǸоõ»¹²»ÈçÖ±½ÓÊäÈë ²»ÖªµÀÄãµÄ×÷ÓÃÊÇʲô
Ö»ÊÇ´¿´âµÄŪ³ÉÄǸöÐÎʽÂð? ºÇºÇ
¹¤×÷ÁË,ż¶û»áÉÏÀ´~¿ÉÒÔ¹Ø×¢ÐÂÀË΢²© @ÔÆÊÇ·çµÄÃÎ_Matlab
3Â¥2010-05-22 17:03:10
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

379631818

Ìú¸Ëľ³æ (ÖøÃûдÊÖ)

nono2009:½¨Òéͨ¹ý¡°ÒýÓûظ´¸ÃÌû¡±£¬ÒÔ±ã±ðÈËÊÕµ½ÄãµÄmessage. 2010-05-22 18:03:52
¸Ð¾õsubsÓпÉÄܽâ¾öÕâ¸öÎÊÌâ

»»¸ö½Ç¶È°É£¬ÔÚmatlabÖÐÈçºÎ¶¨ÒåÒ»¸öº¯Êý
Áîf(x)=sin(x)+cos(x), ÓÃmatlab»­³öf(x)µÄͼÐΣ¬
ÄÇôÈçºÎ»­³öf(x-5)µÄͼÐÎ

[ Last edited by 379631818 on 2010-5-22 at 17:53 ]
4Â¥2010-05-22 17:20:34
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

lijinfeng042

ľ³æ (СÓÐÃûÆø)

Matlab

¡ï
robert2020(½ð±Ò+1):Â¥Ö÷µÄÎÊÌâËÆºõ»¹Ã»Óнâ¾ö£¬¹ÄÀø¼ÌÐø½â´ð¡£ 2010-05-22 22:40:48
ÒýÓûØÌû:
Originally posted by 379631818 at 2010-05-22 17:20:34:
¸Ð¾õsubsÓпÉÄܽâ¾öÕâ¸öÎÊÌâ

»»¸ö½Ç¶È°É£¬ÔÚmatlabÖÐÈçºÎ¶¨ÒåÒ»¸öº¯Êý
Áîf(x)=sin(x)+cos(x), ÓÃmatlab»­³öf(x)µÄͼÐΣ¬
ÄÇôÈçºÎ»­³öf(x-5)µÄͼÐÎ

[ Last edited by 379631818 on 2010-5-22 at 17:53 [ ...

ºÃÏñÊDz»Í¬µÄÎÊÌâ°É ͼÐÎÄǸö¼òµ¥°¡
clc
clear all
x=1:0.1:10;
y1=f(x);
y2=f(x-5);
plot(x,y1,'r+',x,y2,'go')
legend('f(x)','f(x-5)',1);
%%%%%%%%%%%%%%%f.m
function F=f(x)
F=sin(x)+cos(x);      %¶¨Ò庯Êý¹ØÏµÊ½




[ Last edited by lijinfeng042 on 2010-5-22 at 18:36 ]
¹¤×÷ÁË,ż¶û»áÉÏÀ´~¿ÉÒÔ¹Ø×¢ÐÂÀË΢²© @ÔÆÊÇ·çµÄÃÎ_Matlab
5Â¥2010-05-22 18:35:13
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379631818

Ìú¸Ëľ³æ (ÖøÃûдÊÖ)

zzuwangshilei:¹ÄÀø½øÒ»²½ÌÖÂÛ×Ô¼ºµÄ»°Ìâ 2010-05-23 10:08:53
ÒýÓûØÌû:
Originally posted by lijinfeng042 at 2010-05-22 18:35:13:

ºÃÏñÊDz»Í¬µÄÎÊÌâ°É ͼÐÎÄǸö¼òµ¥°¡
clc
clear all
x=1:0.1:10;
y1=f(x);
y2=f(x-5);
plot(x,y1,'r+',x,y2,'go')
legend('f(x)','f(x-5)',1);
%%%%%%%%%%%%%%%f.m
function F=f(x)
F=sin(x)+cos(x);  ...

»¹ÊÇûÓÐÓõ½º¯Êý´ú»»
ÎҵĴúÂ룺

f=inline('sin(x)+cos(x)');fplot(f,[-10,10],'b');hold on;syms x;fplot(inline(subs(f,x,x-5)),[-10,10],'r');

͉˕
inline(subs(f,x,x-5))

ans =

     Inline function:
     ans(x) = sin(x-5)+cos(x-5)

ÎÒÒªµÄÕýÊÇÕâÖÖ·ûºÅ½á¹û£¬¶ø²»ÊÇÊýÖµ½á¹û
ËùÒÔ£¬ÎÒµÄÎÊÌ⻹ûÓнâ¾ö£¬Ï£Íû¸÷λ¸ßÊÖ°ïÖú£¡



[ Last edited by 379631818 on 2010-5-23 at 10:54 ]
6Â¥2010-05-22 19:43:22
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

lijinfeng042

ľ³æ (СÓÐÃûÆø)

Matlab

¡ï ¡ï
adu886886(½ð±Ò+2):¹ÄÀøÓ¦Öú 2010-05-23 13:47:18
379631818(½ð±Ò+6):лл°ïÖú£¬Ï£Íû¼ÌÐøÅ¬Á¦½øÒ»²½½â¾öÎÊÌâ 2010-05-23 14:53:17
ÒýÓûØÌû:
Originally posted by 379631818 at 2010-05-22 19:43:22:


»¹ÊÇûÓÐÓõ½º¯Êý´ú»»
ÎҵĴúÂ룺

f=inline('sin(x)+cos(x)');fplot(f,[-10,10],'b');hold on;syms x;fplot(inline(subs(f,x,x-5)),[-10,10],'r');

͉˕
inline(subs(f,x,x-5))
...

ÕâÊÇÒ»¸öÓÃÕýÔò˼·¸ÄµÄ³ÌÐò ÏÈ´¦Àí³Æ×Ö·û ÔÙ¸ÄΪº¯Êý ²»ÖªµÀ¶ÔÄãÓÐû°ïÖú
CODE:
clc,clear all
s='f(x)*e^(3*x)+f(x)*e^(5*x)+f(x)*e^(7*x)+¡­¡­+¡­¡­';
s1=regexprep(s,'(\)\*e\^)','+') ;
s2=regexprep(s1,'+(','+') ;
s3=regexprep(s2,'\*x','') ;
g=inline(s3)

[ Last edited by lijinfeng042 on 2010-5-23 at 13:11 ]
¹¤×÷ÁË,ż¶û»áÉÏÀ´~¿ÉÒÔ¹Ø×¢ÐÂÀË΢²© @ÔÆÊÇ·çµÄÃÎ_Matlab
7Â¥2010-05-23 13:10:14
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

379631818

Ìú¸Ëľ³æ (ÖøÃûдÊÖ)

ÒýÓûØÌû:
Originally posted by lijinfeng042 at 2010-05-23 13:10:14:

ÕâÊÇÒ»¸öÓÃÕýÔò˼·¸ÄµÄ³ÌÐò ÏÈ´¦Àí³Æ×Ö·û ÔÙ¸ÄΪº¯Êý ²»ÖªµÀ¶ÔÄãÓÐû°ïÖú

[code]clc,clear all
s='f(x)*e^(3*x)+f(x)*e^(5*x)+f(x)*e^(7*x)+¡­¡­+¡­¡­';
s1=regexprep(s,'(\)\*e\^)','+') ;
s2=regexpr ...

ÄѵÀmatlabÖÐûÓжÔÕû¸öº¯Êý½øÐÐÅúÁ¿´ú»»µÄ·½·¨Âð
8Â¥2010-05-23 14:54:22
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

lijinfeng042

ľ³æ (СÓÐÃûÆø)

Matlab

¡ï ¡ï
nono2009(½ð±Ò+1):¹ÄÀøÓ¦Öú£¡ 2010-05-23 21:14:10
robert2020(½ð±Ò+1):¹ÄÀøÓ¦Öú£¬»¶Ó­³£À´·ÂտģÄâ°æ½»Á÷¡£ 2010-05-23 22:32:44
zzuwangshilei:¶àлÌṩ½¨Òé 2010-05-24 08:47:07
ÒýÓûØÌû:
Originally posted by 379631818 at 2010-05-23 14:54:22:

ÄѵÀmatlabÖÐûÓжÔÕû¸öº¯Êý½øÐÐÅúÁ¿´ú»»µÄ·½·¨Âð

Ó¦¸ÃûÓÐ ´ú»»µÄµÈʽ¹ØÏµÔÚmatlabÖÐsimpleÖ®ÀàµÄ¶¼Êǵ÷ÓÃmapleµÄ ºÇºÇ
Ö»ÄÜ×Ô¼º±àдÁË ¿ÉÒԲο¼Ò»Ï °ïÖúÀïÃæµÄmwcos2sin
¹ØÏµ cos(E)^2 =(1-sin(E)^2)
CODE:
function [s,err] = mwcos2sin(s)
% MWCOS2SIN  MathWorks additional simplifications
% mwcos2sin(s) replaces cos(E)^2 by (1-sin(E)^2) and
%    cosh(E)^2 by (1+sinh(E)^2)
siz = size(s);
s = char(s);
for k = fliplr(findstr(s,'cos('))
   p = cumsum((s(k:end)=='(')-(s(k:end)==')'));
   e = k+min(find(s(k:end)==')' & p==0))-1;
   if e+2 <= length(s) && s(e+1)=='^' && s(e+2)=='2'
      s = [s(1:k-1) '(1-sin' s(k+3:e+2) ')' s(e+3:end)];
   end
end
for k = fliplr(findstr(s,'cosh('))
   p = cumsum((s(k:end)=='(')-(s(k:end)==')'));
   e = k+min(find(s(k:end)==')' & p==0))-1;
   if e+2 <= length(s) && s(e+1)=='^' && s(e+2)=='2'
      s = [s(1:k-1) '(1+sinh' s(k+4:e+2) ')' s(e+3:end)];
   end
end
s = reshape(sym(s),siz);
[s,err] = maple('map','convert',s,'sincos');

²»¹ý ±ÈÕýÔòÂé·³
¹¤×÷ÁË,ż¶û»áÉÏÀ´~¿ÉÒÔ¹Ø×¢ÐÂÀË΢²© @ÔÆÊÇ·çµÄÃÎ_Matlab
9Â¥2010-05-23 16:38:57
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

lijinfeng042

ľ³æ (СÓÐÃûÆø)

Matlab

ÒÔǰ±à³Ì´¦Àí×Ö·ûϰ¹ßÕýÔò ºÇºÇ
¹¤×÷ÁË,ż¶û»áÉÏÀ´~¿ÉÒÔ¹Ø×¢ÐÂÀË΢²© @ÔÆÊÇ·çµÄÃÎ_Matlab
10Â¥2010-05-23 16:41:42
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
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