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信彼南山

木虫 (著名写手)

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xiegangmai(金币+1): 谢谢参与! 2011-08-26 07:09:08
按照你的数据,T-S曲线是这样


dsdt曲线是这样


这个曲线用你那个式子貌似拟合不出来啊
11楼2011-08-25 20:30:38
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信彼南山

木虫 (著名写手)

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wangj25(金币+40): 已经按照你的方法弄了,你的思路是完全正确的,是我的数据有点问题,谢谢了 2011-08-25 22:02:08
xiegangmai(金币+1): 辛苦了! 2011-08-26 07:09:33
CODE:
% wangj25
clear;clc;
%% 初始数据
z=[0 48.1
8 46.97
16 44.63
24 39.98
32 38.32
40 37.69
48 37.11
56 35.98
64 35.66
72 33.09
80 32.11
88 31.96
96 31.89
120 31.34
144 31.86
168 32.51
192 31.66 ];
%% main
T=z(:,1);
S=z(:,2);
figure(1);plot(T,S);
h=1;
T0=0;TT=192;
T1=T0:h:TT;
S1=spline(T,S,T1);
z1=[T1;S1];
figure(2);plot(T1,S1);
dsdt=[];
for i=1:TT-1
    dsdt(i)=(S1(i+2)-S1(i))/(T1(i+2)-T1(i));
end
t=T1(2:TT);
figure(3);plot(t,dsdt);

12楼2011-08-25 20:58:34
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