What does the following code mean? How is it used?

PKrange 0
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I looking for an explanation in a granular level to understand what the following code means:

idx=y==100;

From what I understand, it is taking a derivative of a variable x, setting it equal to y, equal to 100. Although, I'm not too sure what the purpose of this code would be.

matlab
1 Answers

For idx=y==100; MATLAB performs the following steps:

  1. It determines which of the two operators, == and = is invoked first: Since the == operator has a higher precedence than the = operator, it selects y==100. To learn about operator precedence, you can have a look at https://www.mathworks.com/help/matlab/matlab_prog/operator-precedence.html.
  2. The operation y==100, then compares y to 100 and returns logical array of the same size as y having 1 at position where y is equal to 100 and 0 at other positions. To learn more about the == operator you can have a look at https://www.mathworks.com/help/matlab/ref/eq.html.
  3. Finally, MATLAB invokes the = operator: idx= assigns the result of y==100 to the variable idx.
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