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Use of vpa results

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Dmytro
Dmytro on 1 Nov 2011
Hello,
Using vpa, I can get, for example
>> p=vpa('1/3',50)
p =
0.33333333333333333333333333333333333333333333333333
However, when I try to use the obtained value, precision is lost:
>> vpa(p/3,50)
ans =
0.11111111111111111111111111111111
How can I manipulate with such results without loosing precision? I tried many methods, but no one works:(
Thank you very much for your help!
Dima
  1 Comment
Dmytro
Dmytro on 1 Nov 2011
I discovered, that problem can be solved by specifying first
digits(50)
Probably, it uses specified digits precision before using precision specified in vpa(...,50) in such cases.
Thank you for your answer, I found solution immediately after this!)

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Answers (1)

Walter Roberson
Walter Roberson on 1 Nov 2011
I would experiment with
vpa(subs('P/3','P',p),50)
Also, perhaps
vpa(p/sym(3),50)
  1 Comment
Dmytro
Dmytro on 1 Nov 2011
Thank you for your answer. However, it does not work:( I will be very grateful for any further suggestions how to tackle this problem.

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