The Origin Forum
File Exchange
Try Origin for Free
The Origin Forum
Home | Profile | Register | Active Topics | Members | Search | FAQ | Send File to Tech support
Username:
 Password:
Save Password
Forgot your Password? | Admin Options

 All Forums
 Origin中文论坛
 Origin 中文论坛 (Chinese Origin Forum)
 origin拟合动力学方程		  New Topic  Reply to Topic
 Printer Friendly
Author Previous Topic Topic Next Topic Lock Topic Edit Topic Delete Topic New Topic Reply to Topic

夜寐

20 Posts
Posted - 07/19/2020 :  10:37:56 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Ver. and Service Release (Select Help-->About Origin): OriginPro 2020 (64-bit) SR1
9.7.0.188 (学习版)

Operating System: win10
我想用origin拟合动力学方程，类似于 t=1 -3(1 - X)^2/3 + 2(1-x)这种，然后自定义函数一直失败，甚至不如用excel来的快捷。。
现在需要用复杂的方程了，要用到最小二乘法，t=τ_F X+τ_P (1-3〖(1-X)〗^(2⁄3)+2(1-X))+τ_R (1-(1-X)^(1/3) )，请问要如何拟合？尝试了很久一直失败，谢谢

yuki_wu

896 Posts
Posted - 07/21/2020 :  10:56:13 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

不清楚你说的失败是指定义函数出现错误还是拟合不收敛？建议参考以下的教程：
https://www.originlab.com/doc/Tutorials/SurfaceFit-with-UserDef-FitFunc

Regards, Yuki
OriginLab
Go to Top of Page

夜寐

20 Posts
Posted - 07/27/2020 :  03:17:51 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
quote:
Originally posted by yuki_wu

Hi,

不清楚你说的失败是指定义函数出现错误还是拟合不收敛？建议参考以下的教程：
https://www.originlab.com/doc/Tutorials/SurfaceFit-with-UserDef-FitFunc

Regards, Yuki
OriginLab


您好，是这样的，我有两条曲线，一个是概率密度，一个是总体分布，这俩的函数是相关的，我想同时拟合他们俩。
y2=100*(1-exp(-(x/l)^m))
y1=100/(l^m)*m*(x^(m-1))*exp(-(x/l)^m)
可是这样总是只有一条拟合的好，另一条很离谱，比如


都这样了R2还0.99呢。。。
Edited by - 夜寐 on 07/27/2020 03:20:45 AM
Go to Top of Page

yuki_wu

896 Posts
Posted - 08/02/2020 :  10:32:46 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

建议参考以下教程：
https://www.originlab.com/doc/Tutorials/Multi-Functions-Global-Fitting

Regards, Yuki
OriginLab
Go to Top of Page
  Previous Topic Topic Next Topic Lock Topic Edit Topic Delete Topic New Topic Reply to Topic
 New Topic  Reply to Topic
 Printer Friendly
Jump To:
The Origin Forum © 2020 Originlab Corporation Go To Top Of Page
Snitz Forums 2000