sqrt(2) 100 places and more

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Aldin
Aldin 2011-12-15
How to disply sqrt(2) to 100 decimal places in MATLAB or more than 100 decimal places???How to limit my precision

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采纳的回答

Aldin
Aldin 2011-12-15
Here is the answer:
phi = sym('sqrt(2)'); vpa(phi,100)

更多回答（3 个）

the cyclist
the cyclist 2011-12-15
I am not sure, but I think this suite of functions does what you want:
http://www.mathworks.com/matlabcentral/fileexchange/6446-multiple-precision-toolbox-for-matlab
  1 个评论
Aldin
Aldin 2011-12-15
Thank you a lot. This is what i need:
http://apod.nasa.gov/htmltest/gifcity/sqrt2.1mil
It will be enough for me when i get just 100 decimal
Or if you know if it is possible in JAVA you can tell me.

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Sean de Wolski
Sean de Wolski 2011-12-15
If you have the symbolic math toolbox, you can try this:
syms x
vpa(subs(sqrt(x),2),100)
More per comments:
%copying first two lines from nasa file
nasa = '1.414213562373095048801688724209698078569671875376948073176679737990732478462107038850387534327641572735013846230912297024924836055850737212644121497099935831';
syms x;
mlvpa = vpa(subs(sqrt(x),2),length(nasa)-1); %subtract 1 to account for decimal
isequal(char(mlvpa),nasa)
ans = 1
woo!
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显示 15更早的评论
Sean de Wolski
Sean de Wolski 2011-12-15
After installing R2009b, I'm able to replicate the behavior you're seeing on it. My syntax above works on R2011b.
Aldin
Aldin 2011-12-15
Here is the result for R2009b
phi = sym('sqrt(2)'); vpa(phi,100)
Can you say me the result in JAVA

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Laura Proctor
Laura Proctor 2011-12-15
format long
will show 15 digits.
fprintf(1,'%.100f\n',sqrt(2))
will show 100 digits. However, that precision is not stored in sqrt(2) - you can see that most of the digits are zero.
By default, numbers are stored as double in MATLAB. In order to understand what that means, I'm linking the following page:
http://www.mathworks.com/support/tech-notes/1100/1108.html
  1 个评论
Aldin
Aldin 2011-12-15
Laura,
Thank you for your answer. I know "double" from JAVA. But i need 100 precesion not 16. See this: http://apod.nasa.gov/htmltest/gifcity/sqrt2.1mil
Or if you know if it is possible in JAVA you can tell me.

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