清空筛选条件
清空筛选条件

estimate the parameters of an equation

1 次查看（过去 30 天）
Nikolas Spiliopoulos
回答： Steven Lord 2017-3-20
Hi there,
I have a question:
I have an equation like this: 45=a*5^b;
is there any way to estimate a and b only from this equation?
thanks
  1 个评论
Adam
Adam 2017-3-20
At a glance, without putting much thought into it I'd imagine there are an infinite number of solutions unless you are restricting yourself to integers only.

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Star Strider
Star Strider 2017-3-20
No.
You are estimating 2 parameters with 1 (x,y) data pair. There is no unique solution.

更多回答（1 个）

Steven Lord
Steven Lord 2017-3-20
Borrowing a problem from Cleve: "I'm thinking of two numbers. Their average is 3. What are the numbers?" I just wrote down my answer; I would be very surprised if you gave the same answer I wrote down.
Like Cleve's question, your question has infinitely many solutions. But if you want the solution for a in terms of b:
syms a b
f = 45 == a*5^b;
asol = solve(f, a)
check = isAlways(subs(f, a, asol))

类别

在 Help Center 和 File Exchange 中查找有关 Mathematics 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by