how can we do this?

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diadalina
diadalina 2018-11-29
编辑： diadalina 2018-12-4
i want to calculate the maximum of vectors éléments and its position using the diff command, can any one help me ?
  2 个评论
John D'Errico
John D'Errico 2018-11-29
Why not just use max? Since it does exactly what you claim to want.
diff as applied to a vector will not help you here.
diadalina
diadalina 2018-11-29
it is another way to calculate the max ?

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madhan ravi
madhan ravi 2018-11-29
[value,index]=max(vector) %use max which does exactly what you want
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Jan
Jan 2018-12-3
编辑：Jan 2018-12-3
@diadaline: Use these three inputs:
a = rand(1, 10)
b = 1:10
c = 10:-1:1
While using max() is easy here, there is no chance to use diff() to find a maximum value. But here, diff can be useful:
d = sin(0:0.001:pi)
Here you have the additional knowledge, that the elements are monotonically increasing and decreasing. Together with this knowledge diff can be used:
find(diff(d) <= 0, 1, 'first')
max() is more useful, because it works in the general case also.
diadalina
diadalina 2018-12-4
thank you mr Jan, now it is clear for me.

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