Clarification about using only the first 'namelengthmax' characters of the name

조회 수: 8(최근 30일)
In Matlab documentation, it states the following
Although variable names can be of any length, MATLAB uses only the first N characters of the name, (where N is the number returned by the function namelengthmax), and ignores the rest. Hence, it is important to make each variable name unique in the first N characters to enable MATLAB to distinguish variables.
In my machine, N = 63. But if I attempt to use the following code:
Matlab did indeed create two variables which contradicts what mentioned in the documentation. Any clarifications!

채택된 답변

Image Analyst
Image Analyst 2019년 12월 30일
How did you figure out N? Anyway, your variable length is 61, which is not more than 63 so you'll be okay.
alen = length('Aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa')
blen = length('Aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaab')
alen =
blen =
  댓글 수: 1
Adam Danz
Adam Danz 2019년 12월 30일
편집: Adam Danz 2019년 12월 30일
l = namelengthmax provides the maximum variable name length.
If the first l characters of two variable names are the same, the second one will overwrite the first.
Here are two variable names that are 64 characters long and only differ by the 64th character
Aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa = 1;
Aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaab = 0;
The result is a warning. Both variable names are truncated to 63 characters and the 2nd one overwrites the first.
Warning: 'Aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa' exceeds the MATLAB maximum name length of 63
characters and will be truncated to 'Aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa'.
Warning: 'Aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaab' exceeds the MATLAB maximum name length of 63
characters and will be truncated to 'Aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa'.
List all variables in workspace
Your variables are:

댓글을 달려면 로그인하십시오.

추가 답변(0개)




Community Treasure Hunt

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

Start Hunting!

Translated by