log function for symbol with power

3 次查看（过去 30 天）
Matan
Matan 2012-11-22
Hi.
Can somebody help me with finding and using a function that perform log in a specific base for a symbol with power??
For ex, if I write:
syms a;
and have: b=a^15;
I want to do loga(b) and get '15'.
How can I do so??
Thanks.

请先登录，再回答此问题。

回答（2 个）

Walter Roberson
Walter Roberson 2012-11-22
Call into MuPAD with feval(symengine) or evalin(symengine) to use its log() function: http://www.mathworks.com/help/symbolic/mupad_ref/log.html
This is not the same as the log() you get at the MATLAB interface level.
Andrei Bobrov
Andrei Bobrov 2012-11-22
evalin(symengine,'log(a,a^15)')
feval(symengine,'log',a,a^15)

类别

在 Help Center 和 File Exchange 中查找有关 Common Operations 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