Solving an unknown with a ln

2016 9 23
1 个回答
回答已采纳
更新时间：2016 9 23
4 次查看（30 天）

0 个投票

Solve H if 5^H=15265 if ln(5^H)=H*ln(5) Getting a subscript error any help?

2 个评论
显示 无 隐藏 无

Thorsten
Thorsten 2016-9-23
Please post your complete minimal Matlab code that generates the error, and the exact error that is displayed.
James Tursa
James Tursa 2016-9-23
Note: The MATLAB function for the natural logarithm function ln is called log.

请先登录，再进行评论。

请先登录，再回答此问题。

 采纳的回答

James Tursa
James Tursa 2016-9-23

1 个投票

Can't you just substitute your expression and then divide by the appropriate value?

3 个评论
显示 1更早的评论 隐藏 1更早的评论

Anass Banbouk
Anass Banbouk 2016-9-23
I've tried substitution it doesn't seem to work.
James Tursa
James Tursa 2016-9-23
编辑：James Tursa 2016-9-23
So, you start with this:
5^H = 15265
and this
ln(5^H) = H*ln(5)
Can't you figure out how to apply some type of operation to the 1st equation to make it look like the 2nd equation? And then do an appropriate substitution based on the 2nd equation?
Anass Banbouk
Anass Banbouk 2016-9-23
I've had too many coffees and I was drawing a blank on an obvious solution thank you for pointing it out.

请先登录，再进行评论。

更多回答（0 个）

类别

在 帮助中心 和 File Exchange 中查找有关 Physics 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