log function for symbol with power

2012 11 22
2 个回答
7 次查看（30 天）

0 个投票

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.

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回答（2 个）

Walter Roberson
Walter Roberson 2012-11-22

0 个投票

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

0 个投票

evalin(symengine,'log(a,a^15)')
feval(symengine,'log',a,a^15)

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Matan
Matan
2012-11-22

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