Is this a bug of MATLAB?

2 次查看（过去 30 天）
M. Wang
M. Wang 2024-8-25
评论： Image Analyst 2024-8-25
% Here is my code
[vpa(str2sym('asin(1)*2'),100);vpa(str2sym('pi'),100)]
The output is:
3.1415926535897932384626433832795
3.1415926535897932384626433832795
I think the correct answer should be longer. Is it a bug or an expected behavior?

请先登录，再回答此问题。

采纳的回答

Stephen23
Stephen23 2024-8-25
编辑：Stephen23 2024-8-25
Ran in:
"I think the correct answer should be longer. Is it a bug or an expected behavior?"
It is not a bug: the default number of digits is 32:
https://www.mathworks.com/help/symbolic/digits.html
When you create a new symbolic array it will be displayed using the default number of digits:
d = digits
d = 32
a = vpa(str2sym('asin(1)*2'),100)
a = 
3.141592653589793238462643383279502884197169399375105820974944592307816406286208998628034825342117068
b = vpa(str2sym('pi'),100)
b = 
3.141592653589793238462643383279502884197169399375105820974944592307816406286208998628034825342117068
c = [a,b] % uses the default number of digits
c = 
d = digits(100) % returns the PREVIOUS default digits, set NEW default digits
d = 32
c = [a,b]
c = 
  1 个评论
Image Analyst
Image Analyst 2024-8-25
@M. Wang, pi has an infinite number of digits. Obviously not all of them can be displayed. How many digits did you expect to be installed, and how many do you want or need to be displayed?

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Code Performance 的更多信息

标签

产品


版本

R2024a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by