problem in using symbols

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

Answer 1

[Paulo Silva]

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

[omnia]

I am sorry. I do not understand

[Naz]

@omnia: Can you make your question a bit more clear?

[omnia]

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]

omnia, use

vpa((3*10^-12)/(1-f))

[omnia]

thanks Walter. It worked.