problem in using symbols

2011 12 7
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Hi everyone I have a problem in my program. I have a symbol called 'f' in an equation when I write (3*10^-12)/(1-f) it is written in the command window as '1/(1237940039285380274899124224/3713820117856141-1237940039285380274899124224/3713820117856141*f_ES)'which is the same value but in much complex form. How can I make the program write it in the simple form? I use this equation in the remaining of the program and it become much harder to follow and calculate.
thanks

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回答（1 个）

Paulo Silva
Paulo Silva 2011-12-7

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doc vpa %just a wild guess of something that might be useful to you

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omnia
omnia 2011-12-8
I am sorry. I do not understand
Naz
Naz 2011-12-8
@omnia: Can you make your question a bit more clear?
omnia
omnia 2011-12-10
try to do the following in the command window:
syms f
(3*10^-12)/(1-f)
the result will be :
3713820117856141/1237940039285380274899124224/(1-f)
this complex form prevent me from following the program. How can I make MATLAB write it as the above simple expression I entered ??
Walter Roberson
Walter Roberson 2011-12-10
omnia, use
vpa((3*10^-12)/(1-f))
omnia
omnia 2011-12-16
thanks Walter. It worked.

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omnia
omnia
2011-12-7

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