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maximum values in vector

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RAAD AL-DULAIMI
RAAD AL-DULAIMI 2015-3-30
编辑： Star Strider 2015-3-30
hi everyone, i have a vector consist of 5000 elements and i need to find the maximum values for 2000 elements with their real index , plz can anyone help me in that? thx

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回答（2 个）

Star Strider
Star Strider 2015-3-30
编辑：Star Strider 2015-3-30
The max function will return only the first maximum in the array if there are more than one. To find all of them, use find:
Example:
Vector = randi(5, 1, 15)
MaxValuesIdx = find(Vector == max(Vector))
produces (in this instance):
Vector =
3 1 2 5 1 3 5 3 4 5 5 2 4 2 1
MaxValuesIdx =
4 7 10 11
EDIT — To get the highest 2000 values, use the sort function.
Image Analyst
Image Analyst 2015-3-30
Which 2000? The first 2000? Try this
[maxValue, indexOfMaxValue] = max(yourVector(1:2000));
What does "without changing positions mean"? Do you want an array of the same length but all zeros except for the max being in its original location? If so
output = zeros(size(yourVector)); % Initialize
yourVector(indexOfMaxValue) = maxValue; % Assign that one element
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RAAD AL-DULAIMI
RAAD AL-DULAIMI 2015-3-30
thanx for responding ,,, i mean that i need the highest 2000 values on these 5000 . and the real index of those 2000 in the vector

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