integer operands are required for colon operator when used as index

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Ulrik Nash
Ulrik Nash 2012-1-24
编辑： Walter Roberson 2025-4-16
Why do I get the warning "integer operands are required for colon operator when used as index" in the final line is this code:
vector_examined = rand(items,1); criteria = vector_examined < value; passes = find(criteria);
  2 个评论
the cyclist
the cyclist 2012-1-24
Would it be possible for you to post some self-contained code that will produce the error (without us having to guess what "items" and "value" look like)? For example, if I choose items=5 and value=0.2, your code runs just fine for me.
Walter Roberson
Walter Roberson 2012-1-24
I do not see anything obvious. Is it possible that you typed this line in for us, rather than using copy-and-paste? Could you also show us the previous line?

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回答（1 个）

nick
nick 2025-4-16
Hello Ulrik,
Kindly share the entire code and associated files to help debug the issue.
The warning "integer operands are required for colon operator when used as index" typically occurs when one attempts to use non-integer values in indexing operations. Please ensure that:
  1. 'items' is a positive integer, as it defines the size of the vector
  2. 'value' is a scalar or a compatible size for comparison with 'vector_examined'.
Kindly refer to the following documentation to know more about indexing in MATLAB:
https://www.mathworks.com/company/technical-articles/matrix-indexing-in-matlab.html

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