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7Â¥2015-11-08 09:17:03
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Ó¦¸ÃÊÇ>=4
Õâ¸öÊÇÑùÌõ²åÖµÎÊÌâµÄÖØÒªÐÔÖÊ!
f''(x)ƽ·½µÄ»ý·Ö>=Âú×ã²åÖµÌõ¼þµÄÑùÌõS(x)(ÕâÀï¶ÔÓ¦µÄÊÇÈý´Î²åÖµ¶àÏîʽ)µÄ¶ÔÓ¦»ý·Ö!
ÌâÄ¿ÖеÄS(x)=-x^2*(1-x)
Matlab·½±ãЩ!
>> f=-x^2*(1-x)
f =
-x^2*(1-x)
>> diff(f,x,2)
ans =
-2+6*x
>> int('(-2+6*x)^2',0,1)
ans =
4
Èç¹ûfÈ¡ËĴβåÖµ¶àÏîʽ:
>> f=-x^2*(1-x)+x^2*(1-x)^2
f =
-x^2*(1-x)+x^2*(1-x)^2
>> diff(f,x,2)
ans =
-2+6*x+2*(1-x)^2-8*x*(1-x)+2*x^2
>> int('(-2+6*x+2*(1-x)^2-8*x*(1-x)+2*x^2)^2',0,1)
ans =
24/5
>4

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2Â¥2015-09-13 10:01:42
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ÒýÓûØÌû:
2Â¥: Originally posted by wurongjun at 2015-09-13 10:01:42
ÄãµÄ½áÂÛд·´ÁË!
Ó¦¸ÃÊÇ>=4
Õâ¸öÊÇÑùÌõ²åÖµÎÊÌâµÄÖØÒªÐÔÖÊ!
f''(x)ƽ·½µÄ»ý·Ö>=Âú×ã²åÖµÌõ¼þµÄÑùÌõS(x)(ÕâÀï¶ÔÓ¦µÄÊÇÈý´Î²åÖµ¶àÏîʽ)µÄ¶ÔÓ¦»ý·Ö!
ÌâÄ¿ÖеÄS(x)=-x^2*(1-x)
Matlab·½±ãЩ!
>> f=-x ...

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3Â¥2015-09-13 10:32:46
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