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y =
  1.0e+002 *
   4.3541         
   2.9607         
  -3.6574 + 5.2191i
  -3.6574 - 5.2191i

(2)µÚ2¸öÎÊÌâÊÇÔÚµÚ1¸öÎÊÌâ»ù´¡Éϵġ£ÎÒµÄÄ¿µÄÊÇΪÁË»­³öxÓëyµÄ¹ØÏµÍ¼£¬ËùÒÔÎÒ±ØÐëµÃ¶ÔÁ¬ÐøµÄx½øÐÐÇó½â£¬È»ºóÇó³öy£¬×÷ͼ¡£ÒÔÒ»¸ö¼òµ¥Àý×Ó°É£º

x=1:1:10; %xÈ¡1µ½10
syms y;
a=y+1;
b=y-1;

f=a*b+a+b*x+y+6*x+2

%½â·½³Ìf=0
equation = [char(f) ' = ' num2str(0,9)];
A=solve(equation, 'y')

double(A)

plot(x,y)

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΢³¾¡¢ÃÎÏë(½ð±Ò+2): лл²ÎÓëÓ¦Öú~ 2011-10-12 20:42:05
ÆäʵµÚ¶þ¸öÎÊÌâÀïÃæ£¬Ëã³öAÖ®ºó£¬Ö±½Ó
CODE:
x = 20:80;
Y= subs(A, x);
plot(x, Y(1, :), 'b', x, Y(2, :), 'r');

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xzhdty(½ð±Ò+2): »¶Ó­³£À´³ÌÐòÓïÑÔ¿´¿´ 2011-10-12 15:31:47
΢³¾¡¢ÃÎÏë(½ð±Ò+2, ³ÌÐòÇ¿Ìû+1): sudo×ÜÊǺÜÈÈÐĵģ¬×£¸£Å¶£¡ 2011-10-12 20:41:46
zhmdream(½ð±Ò+40): лл°¡£¬ÎÒÊÔÊÔ 2011-10-12 20:45:04
zhmdream(½ð±Ò+10): ллÁË£¬ºÇºÇ 2011-10-14 22:14:37
Äã²»ÓÃÿ´Î¶¼·ÅÄÇô¶à·ÖÉÏÀ´µÄ...

(1)ʹÓÃisrealº¯ÊýºÍÑ­»·
CODE:
for i=1:length(y)
    if isreal(y(i)) && y(i)>400 %ÅжÏy(i)ÊÇ·ñÊÇʵÊý£¬²¢ÇÒÊÇ·ñ´óÓÚ400
        fprintf(1, '%.9f\n', y(i));
    end
end

(2)
CODE:
syms x y; %×¢ÒâÓõ½µÄ·ûºÅ¶¼ÒªÉùÃ÷Ò»ÏÂ
a=y+1;
b=y-1;

f=a*b+a+b*x+y+6*x+2;

%½â·½³Ìf=0
equation = [char(f) ' = 0'];
A=solve(equation, 'y');

%ÉÏÃæ½âµÃµÄ½á¹ûÊÇ
%A =
%  - x/2 - (x^2 - 16*x - 4)^(1/2)/2 - 1
%   (x^2 - 16*x - 4)^(1/2)/2 - x/2 - 1

%¶ÔÓÚ·ûºÅʽ×Ó£¬Ê¹ÓÃsubsº¯Êý´úÈëÊýÖµ

%×¢ÒâÉÏÃæµÄ·½³ÌÒòΪÓпª·½£¬ËùÒÔ²»Ò»¶¨Äܽâ³öʵÊý½â£¬ÕâÀïÖ±½Óȡһ¶ÎÓÐʵÊý½âµÄ
x = 20:80;
y1 = zeros(1, length(x)); %ϰ¹ßÉÏÑ­»·Ç°Ïȸø¶¨´æ´¢¿Õ¼ä
y2 = zeros(1, length(x));
for i=1:length(x)
    y1(i) = subs(A(1), x(i));
    y2(i) = subs(A(2), x(i));
end

plot(x, y1, 'b', x, y2, 'r');

2Â¥2011-10-12 10:12:19
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

zhmdream

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ÒýÓûØÌû:
2Â¥: Originally posted by sudo at 2011-10-12 10:12:19:
Äã²»ÓÃÿ´Î¶¼·ÅÄÇô¶à·ÖÉÏÀ´µÄ...

(1)ʹÓÃisrealº¯ÊýºÍÑ­»·
[code]
for i=1:length(y)
    if isreal(y(i)) && y(i)>400 %ÅжÏy(i)ÊÇ·ñÊÇʵÊý£¬²¢ÇÒÊÇ·ñ´óÓÚ400
        fprintf(1, '%.9f ...

ºÇºÇ£¬Ð»Ð»°ïæ¡£ÎÊÌâ½â¾ö²î²»¶àÁË£¬µ«ÊÇ»¹ÓÐЩСÎÊÌ⣺

ÎÊÌ⣨2£©µÄ·½³Ìµ±Ê±ÊÇΪÁË·½±ã£¬Ëæ±ãÉèµÄ¡£ÎÒÒª½âµÄÊÇÒ»ÔªËĴη½³Ì£¬½âµÄ½á¹ûÓÐÁ½¸öʵ½âºÍÁ½¸öÐé½â¡£ÉáÈ¥Ðé½â£¬²¢Ö»ÓÐʵ½â>400£¬²ÅÊÇÎÒËùÒªÇóµÄ½â£¬²¢ÓÃÓÚ×÷ͼ¡£ÏÂÃæÎÒµÄÉè¼ÆÓë˼·£º

%%%֮ǰ³ÌÐòÊ¡ÂÔ
%Çó½âTg
A=solve(equation, 'Tg');   
Tp=450:1:453;     %±äÁ¿Tpȡֵ£¬²¢½«Tp´úÈ룬Çó³öTg
for i=1:length(Tp)
    Tg1(i) = subs(A(1), Tp(i));
    Tg2(i) = subs(A(2), Tp(i));
    Tg3(i) = subs(A(3), Tp(i));
    Tg4(i) = subs(A(4), Tp(i));
end
%µÃµ½Á½Êµ½âÓëÁ½Ðé½â

%ÏÖÔÚ¶ÔÕâÁ½Êµ½âÓëÁ½Ðé½â£¬½øÐбȽϡ£´óÓÚ400µÄʵÊý½â²ÅÊÇÎÒ×îÖÕÏëÒªµÄ
for i=1:4
     j=1:length(Tg)
    if isreal(Tg(i)(j)) && Tg(i)(j)>400 %ÅжÏTg(i)ÊÇ·ñÊÇʵÊý£¬²¢ÇÒÊÇ·ñ´óÓÚ400
        fprintf(1, '%.9f\n', Tg(i)(j));
    end
end

plot(Tp, Tg) %¶ÔTpÓëTg×÷ͼ

ÎÒÔËÐÐʱ£¬µ½Á˵Ú2²¿·Ö¾Í³ö´í¡£Ð»Ð»£¡
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4Â¥2011-10-13 20:23:16
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sudo

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