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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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logyquan

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[交流] 【求助】请问下面MATLAB程序哪儿不对呢 已有4人参与

我想求非线性方程组
df1=diff(F, x(1))=0
df2=diff(F, x(2))=0
以得到x(1),x(2)的解
用下面的程序,错在哪呢,谢谢高人指点

d1=560
d2=4500
p=40000
h1=12
h2=10
h0=3
s1=240
s2=600
sp=5500
s01=320
s02=1000
d0=d1+d2
syms x(1) x(2);
F=(sp+(s01+s1)* x(1)+(s02+s2)* x(2))*((( x(1)-1)*h0+h1)*d1/(x(1)*d0)+(( x(2)-1)*h0+h2)*d2/(x(2)*d0)-( x(1)-2)*d1*h0/(x(1)*p)-( x(2)-2)*d2*h0/(x(2)*p))
df1=diff(F, x(1))
df2=diff(F, x(2))
fun=inline('df1,df2', 'x');
x0=[1;1];
x=fsolve('fun',x0)
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flyinuniverse58

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zzuwangshilei:可以设置区域语言选项 2010-06-03 09:47:18
I am very sorry that my computer cannot input Chinese, because this is the office computer.
3楼2010-06-03 05:56:24
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flyinuniverse58

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adu886886(金币+1):3k u 2010-06-03 14:07:37
I think the problem is the misusing of 'syms'.
'Syms' doesn't support the variable parameter array.
You could try to change all the x(1), x(2) to x1, x2.

If you want to use variable parameter as array, you can try another software, name is 1stopt.
2楼2010-06-03 05:55:30
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zzuwangshilei

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adu886886(金币+1):辛苦了 2010-06-03 14:07:20
引用回帖:
Originally posted by flyinuniverse58 at 2010-06-03 05:55:30:
I think the problem is the misusing of 'syms'.
'Syms' doesn't support the variable parameter array.
You could try to change all the x(1), x(2) to x1, x2.

If you want to use variable parameter  ...

帮楼主翻一下:
我认为问题在于无法使用'syms'.
'syms'不支持变量参数矩阵.
你应当试着将X(1),x(2)改为X1,X2,看是否可行。

其他方法是,使用其他的软件1stopt.
4楼2010-06-03 09:52:03
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logyquan

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zzuwangshilei:鼓励讨论 2010-06-05 10:48:05
引用回帖:
Originally posted by flyinuniverse58 at 2010-06-03 05:55:30:
I think the problem is the misusing of 'syms'.
'Syms' doesn't support the variable parameter array.
You could try to change all the x(1), x(2) to x1, x2.

If you want to use variable parameter  ...

你好,谢谢,问题是在这里,但是fsolve命令里,fun函数中x要是向量的形式,不知道怎么处理

[ Last edited by logyquan on 2010-6-4 at 13:06 ]
5楼2010-06-04 13:05:18
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