Getting a shorter, more simple answer as output

3 次查看（过去 30 天）
rezheen
rezheen 2025-4-17
编辑： Walter Roberson 2025-4-30
How can I get a shorter answer, ideally an exact answer but decimal is also fine. This is my code:
syms x y
y=(log(x)/log(4))+(log(x^2)/log(4)); dy=diff(y)
Returns the answer as:
13510798882111488/(6243314768165359*x)
I'd like a simpler answer please such as:
3/(x*log(4)) % Exact answer
or;
2.1640/x % Decimal approximation
Thanks.

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采纳的回答

Walter Roberson
Walter Roberson 2025-4-18
Ran in:
syms x y
log4 = log(sym(4));
y=(log(x)/log4)+(log(x^2)/log4); dy=diff(y)
dy = 
  2 个评论
rezheen
rezheen 2025-4-30
Hi Walter. When I run your code in Matlab (I have R2021a version), I get:
dy=2.1640/x
Which is great, but doesn't get what you get as output but that's probably because I have the older MATLAB version. Thanks for the answer.
Walter Roberson
Walter Roberson 2025-4-30
编辑：Walter Roberson 2025-4-30
Ran in:
You probably have
sympref('FloatingPointOutput', true)
ans = logical
0
in effect. You want it to be false .

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更多回答（1 个）

rezheen
rezheen 2025-4-17
移动：Matt J 2025-4-17
I figured it out with this code:
sympref('FloatingPointOutput',true);
syms x y
y=(log(x)/log(4))+(log(x^2)/log(4)); dy=diff(y)
Output:
dy =
2.1640/x
Thanks in advance.

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