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Why sometimes we place an empty brackets inside function inputs?

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I don't know the purpose or the mean of these empty square brakets inside many functions, for instance:
min( a, [ ],2)
imshow(a, [ ])

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means that the second value the function receives is empty, in both cases
if you give a value to that second parameter to "min" the function will convert the largest values of "a" into the value you assign to that parameter
You can check the official documentation here:

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