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zongshengl

ľ³æ (СÓÐÃûÆø)

[ÇóÖú] MatlabÖÐÈçºÎµ÷ÓÃMÎļþ×÷ͼ

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Function y=objfun(x)

y=x^2+5*x+20;

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[ Last edited by dbb627 on 2011-11-30 at 22:45 ]
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An important thing in ones life is to have a dream and to achive it!
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

dbb627

ÈÙÓþ°æÖ÷ (ÖøÃûдÊÖ)

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

ÄãµÄtwo_minÊÇ·ñ´æÔÚÁ˵±Ç°¹¤×÷Ŀ¼ÏÂÃæ£¬
function y = two_min(x)
if x<=20
    y = -exp(-(x/20).^2);
else
    y = -exp(-1)+(x-20).*(x-22);
end
The more you learn, the more you know, the more you know, and the more you forget. The more you forget, the less you know. So why bother to learn.
4Â¥2011-11-30 23:30:05
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
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dbb627

ÈÙÓþ°æÖ÷ (ÖøÃûдÊÖ)

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zongshengl(½ð±Ò+10): ллÄãµÄ°ïÖú 2011-12-01 10:37:04
ÃüÁî´°¿ÚÊäÈë
fplot(@objfun,[-10 10])
»òÕß
°Ñº¯Êý¸Ä±£´æ
Function y=objfun(x)

y=x.^2+5*x+20;

È»ºóÔÚÃüÁî´°¿ÚÊäÈë
x=-10:0.1:10;
plot(x,objfun(x))

[ Last edited by dbb627 on 2011-11-30 at 22:54 ]

» ±¾ÌûÒÑ»ñµÃµÄºì»¨£¨×îÐÂ10¶ä£©

The more you learn, the more you know, the more you know, and the more you forget. The more you forget, the less you know. So why bother to learn.
2Â¥2011-11-30 22:48:21
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

zongshengl

ľ³æ (СÓÐÃûÆø)

ËÍÏÊ»¨Ò»¶ä
ÒýÓûØÌû:
2Â¥: Originally posted by dbb627 at 2011-11-30 22:48:21:
ÃüÁî´°¿ÚÊäÈë
fplot(@objfun,[-10 10])
»òÕß
°Ñº¯Êý¸Ä±£´æ
Function y=objfun(x)

y=x.^2+5*x+20;

È»ºóÔÚÃüÁî´°¿ÚÊäÈë
x=-10:0.1:10;
plot(x,objfun(x))
[ Last edited by dbb627 on 2011-11-30 at ...

лл£¡ÎÒ¸ÕÊÔÁË£¬½â¾öÎÊÌâÁË£¬
µ«ÊÇÏÖÔÚÎÒÓÖµ÷ÊÔÁËÒ»¸öÎļþÈçÏ£º

function y = two_min(x)
if x<=20
    y = -exp(-(x/20).^2);
else
    y = -exp(-1)+(x-20)*(x-22);
end

Save the file as two_min.m in a folder on the MATLAB path.

ÔÚÃüÁî´°¿ÚÔËÐÐʱ

>> x=-10:0.1:30;
>> plot(x,two_min(x))

Ìáʾ£º

??? Undefined function or method 'two_min' for input arguments of type 'double'.

ÕâÊÇÔõô»ØÊ£¿Ð»Ð»Äã
An important thing in ones life is to have a dream and to achive it!
3Â¥2011-11-30 23:06:21
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

baby_wolf

гæ (³õÈëÎÄ̳)

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

ÒýÓûØÌû:
4Â¥: Originally posted by dbb627 at 2011-11-30 23:30:05:
ÄãµÄtwo_minÊÇ·ñ´æÔÚÁ˵±Ç°¹¤×÷Ŀ¼ÏÂÃæ£¬
function y = two_min(x)
if x<=20
    y = -exp(-(x/20).^2);
else
    y = -exp(-1)+(x-20).*(x-22);
end

ÕâÑùдÊÇ´íÎóµÄ¡£Ð´µÄÈÃÈ˸оõºÜ¹Ö¡£
Èç¹ûxÖ»ÓÐÒ»¸öÔªËØ£¬Ã»ÓÐÈκÎÎÊÌâ¡£Èç¹ûxÊÇÒ»¸öÏòÁ¿µÄ»°£¬·µ»ØÖµy¾ÍµÃ²»µ½Ï£ÍûµÄÖµ¡£

¿´ÎÒÕâÑùдÊDz»ÊÇ¿ÉÐУº
CODE:
function y=two_min(x)
y=zeros(size(x));  %¶¨ÒåyÓëx³ß´çÏàͬ
ind=(x<=20);      %·µ»ØÒ»¸ölogicÐÍ
y(ind)=-exp(-(x(ind)/20).^2);
ind=(x>20);
y(ind)= -exp(-1)+(x(ind)-20).*(x-22);

5Â¥2011-12-01 01:17:19
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
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