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小木虫论坛-学术科研互动平台 » 计算模拟区 » 仿真模拟 » MATLAB » 【求助】Matlab问题
北京石油化工学院2026年研究生招生接收调剂公告
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mazhanhua_1999

铁虫 (小有名气)

[交流] 【求助】Matlab问题

function y=hanshu(k,A);
k=[k(1) k(2) k(3) k(4) k(5) k(6)];
a0=k(1);
a1=k(2);
a2=k(3);
a3=k(4);  
a4=k(5);
a5=k(6);

lab=A(:,1);
cap=A(:,2);
dap=A(:,3);
eap=A(:,4);
fap=A(:,5);

xw=(1./(lab.^1.5)-a2*ones(20,1)).*(a3*cap+a4*ones(20,1));

y=(a4*lab*cab*dap-a5*eap)*fap/(1+(a0*lap).^0.5+a1*cap+a2*dap+a3*eap).^2;
x1=[0.03274,0.03274,0.03274,0.03556,0.03556,0.03556,0.03556,0.0388,0.0388,0.0388,0.02963,0.02963,0.02963,0.02963,0.03852,0.03852,0.03852,0.0237,0.0237,0.0237,0.04741,0.04741,0.04741,0.04741,0.05333,0.05333,0.05333,0.05333,0.03556,0.03556,0.03556,0.03556,0.03556,0.03556,0.03556]';
x2=[0.05686,0.05686,0.05686,0.05912,0.05912,0.05912,0.05912,0.06128,0.06128,0.06128,0.04926,0.04926,0.04926,0.04926,0.06404,0.06404,0.06404,0.07882,0.07882,0.07882,0.03941,0.03941,0.03941,0.03941,0.02956,0.02956,0.02956,0.02956,0.05912,0.05912,0.05912,0.05912,0.05912,0.05912,0.05912]';
x3=[3.32,2.986,2.831,3.169,2.602,2.133,1.708,2.526,2.012,1.684,3.164,2.668,2.26,1.878,2.611,2.002,1.65,2.637,2.249,1.981,2.64,2.036,1.697,1.504,2.839,2.372,1.99,1.819,3.137,2.58,2.128,2.76,2.307,1.97,1.677]';
x4=[0.134,0.576,0.777,0.702,1.16,1.771,2.225,1.176,1.772,2.096,0.492,0.977,1.453,2.058,1.106,1.86,2.276,0.984,1.527,1.917,0.899,1.699,2.07,2.342,0.866,1.228,1.702,1.887,0.424,1.098,1.708,0.78,1.424,1.939,2.097]';
x5=[0.00119,0.00119,0.00119,0.00119,0.00119,0.00119,0.00119,0.00119,0.00119,0.00119,0.00119,0.00119,0.00119,0.00119,0.00119,0.00119,0.00119,4.02E-4,4.02E-4,4.02E-4,4.02E-4,4.02E-4,4.02E-4,4.02E-4,4.02E-4,4.02E-4,4.02E-4,4.02E-4,9.56E-5,9.56E-5,9.56E-5,3.06E-4,3.06E-4,3.06E-4,3.06E-4]';
y=[5.35692,5.25725,5.148,6.12633,5.96017,5.7608,5.47321,6.5989,6.0658,5.6165,6.0301,5.93721,5.80241,5.76895,6.23535,5.99836,5.12932,6.8791,6.69513,6.46914,7.54958,7.316,7.01067,6.56897,7.16209,6.92098,6.60262,6.13282,8.79241,8.63444,8.44674,7.2556,7.14569,7.0219,6.88093]';

A=[x1' x2' x3' x4' x5'];
k0=[1 1 1 1 1 1 ];
[k,r,j]=nlinfit(k,y','hanshu',k0);

y=hanshu(k,A)

运行提示：
??? Input argument "k" is undefined.

Error in ==> Untitled2 at 2
k=[k(1) k(2) k(3) k(4) k(5) k(6)];
问题出在哪里，高手帮忙，看看程序哪里有错误？

[ Last edited by sunxiao on 2009-3-9 at 08:52 ]
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1楼 2008-09-19 16:39:25
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jiann_li84

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zzgyb(金币+1,VIP+0):谢谢你的参与，欢迎再次光临计算模拟版！
b0是什么？没有定义啊
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2楼2008-09-19 18:24:58
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mazhanhua_1999

铁虫 (小有名气)
b0是k0，改了之后也不行
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3楼2008-09-19 18:35:58
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jiann_li84

木虫 (著名写手)
★ ★
zzgyb(金币+1,VIP+0):谢谢你的参与，欢迎再次光临计算模拟版！
zzgyb(金币+1,VIP+0):谢谢你的参与，欢迎再次光临计算模拟版！
[k,r,j]=nlinfit(k,y','hanshu',k0);
和y=hanshu(k,A);
中的k是否一致，并且k的赋值时什么
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4楼2008-09-19 18:54:56
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mazhanhua_1999

铁虫 (小有名气)
是同一个K，程序就是要拟合出几个K值，初值是随便设的，其实就是想拟合y=(a4*x1*x2*x3-a5*x4)x5/(1+(a0*x1).^0.5+a1*x2+a2*x3+a3*x4).^2;

[ Last edited by mazhanhua_1999 on 2008-9-19 at 19:09 ]
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5楼2008-09-19 19:08:08
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zhangjiandapao

银虫 (正式写手)
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zzgyb(金币+2,VIP+0):谢谢你的参与，欢迎再次光临计算模拟版！
你用正版的软件还是破解版的？我用破解版的也出现这样的问题，解决方法是不要用“调用m文件”的方式，而是直接复制到在主程序里，回车就可以了/。
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6楼2008-09-19 19:13:34
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mazhanhua_1999

铁虫 (小有名气)
我的怎么不可以，显示
??? function y=hanshu(k,A);
    |
Error: Function definitions are not permitted at the prompt or in scripts.

zhangjiandapao  能不能把结果贴出来
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7楼2008-09-19 19:28:12
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zhangjiandapao

银虫 (正式写手)
复制到主程序时，是不能用function 命令的。去掉funciton 命令行。
还有注意定义变量。我觉得你的程序了面几个变量不统一，如下：
lab=A(:,1);中的lab 与(1+(a0*lap)中的lap是否是同一个变量？后者没有定义
cap=A(:,2);中的cap与(a4*lab*cab*dap-a5*eap)是否是同一个变量？后者也没有定义
改了一下，没有运行出来，刚接触，也不是很懂啊！
去matlab 中文论坛试试啊
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8楼2008-09-20 18:26:34
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dnp

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小木虫浪子

优秀版主
见您在置顶帖子matlab问题解答中我对您问题的解答。

修正一点：
在那个帖子中我纠正的函数是nlinfit(x,y,@hanshu,k,A)，现修正为：
nlinfit(x,y,@hanshu,k0)
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What would Jesus do?
9楼2008-09-20 20:00:10
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