what does "X = X./max(max(X))" means?>

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Matlaber
Matlaber 2019-3-12
评论： Abdulmanan Butt 2019-3-13
>> X=[1,2,3,4]
X =
1 2 3 4
>> X = X./max(max(X));
>> X
X =
0.2500 0.5000 0.7500 1.0000
>>
I understand from the output, but what does "./" means?

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回答（3 个）

Stephan
Stephan 2019-3-12
编辑：Stephan 2019-3-12
Hi,
the dot means an elementwise operation. See here:
https://de.mathworks.com/help/matlab/ref/rdivide.html
For more information to this topic see:
https://de.mathworks.com/help/matlab/matlab_prog/array-vs-matrix-operations.html
Best regards
Stephan
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Stephan
Stephan 2019-3-12
编辑：Stephan 2019-3-12
try this:
A=magic(3)
b = [2,4,5]
result1 = A/b
result2 = A./b
or
A=magic(3)
b = [1 -2 3; -4 -5 -6; 7 8 -9]
A/b % mrdivide
A./b % rdivide
Read about the both operations:
https://de.mathworks.com/help/matlab/ref/mrdivide.html
https://de.mathworks.com/help/matlab/ref/rdivide.html
Matlaber
Matlaber 2019-3-12
thanks!
"./" is element by element, one element by one element

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Matlaber
Matlaber 2019-3-12
Abdulmanan Butt
Abdulmanan Butt 2019-3-13
编辑：Abdulmanan Butt 2019-3-13
Hi,
It means,
You are dividing X matrix (element-wise) with the element of matrix X having maximum value.
Like in this case, max(X) or max(max(X)) will be 4, and you are going to divide matrix X with that 4, Where 4 will be divided to each element of matrix X in this element-wise division case, So you got the final result,
X= 0.2500 0.5000 0.7500 1.0000
Regards,
Abdulmanan Butt
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Matlaber
Matlaber 2019-3-13
Thanks. I got it.
"." means element by element, usually one by one
Thanks for your reply.

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