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significant digits

Bill Morgan
Posted 10 years ago
how do I get more significant digits for this result?


http://www.wolframalpha.com/input/?i=a%3D.999%2C+b%3D1%2C+%28arctan%28a%29-arctan%28b%29%29%2F%28a-b%29
POSTED BY: Bill Morgan
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Bill Simpson
Bill Simpson
Posted 10 years ago
Don't use decimal points

http://www.wolframalpha.com/input/?i=%28arctan%28999%2F1000%29-arctan%281%29%29%2F%28999%2F1000-1%29
POSTED BY: Bill Simpson
Bill Morgan
Bill Morgan
Posted 10 years ago
thanks

works with the a and b substitution too:

http://www.wolframalpha.com/input/?i=a%3D999%2F1000%2C+b%3D1%2C+%28arctan%28a%29-arctan%28b%29%29%2F%28a-b%29
POSTED BY: Bill Morgan
Bill Morgan
Bill Morgan
Posted 10 years ago
found that you can also get more precision by keeping the decimal point and adding a bunch of zeros:

http://www.wolframalpha.com/input/?i=a%3D.999000000000000000000000000000%2C+b%3D1%2C+%28arctan%28a%29-arctan%28b%29%29%2F%28a-b%29
POSTED BY: Bill Morgan
Bill Simpson
Bill Simpson
Posted 10 years ago
I learned something from your posting. Thank you.

I thought from previous experiments that WolframAlpha didn't understand assignments to variables.
Perhaps I was wrong or perhaps this is something new that has been added.

If it is new then I wonder if there is a page where new features are announced?
POSTED BY: Bill Simpson
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