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give number to sequence

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Jay Hanuman
Jay Hanuman 2016-12-30
编辑： Jay Hanuman 2016-12-30
I have sequence
a=[17 56 42 12 12 99 102 45 76 76 41 99 12 45 56 17 76 86 125 160 36]
I want to do that give numbering to sequence starting from 1 i.e.minimum value is 12 so give it 1 then next value greater than 12 is 17 so give it 2 likewise so
a = [17 56 42 12 12 99 102 45 76 76 41 99 12 45 56 17 76 86 125 160 36]
a1 = [2 7 5 1 1 10 11 6 8 8 4 10 1 5 7 2 8 9 12 13 3]
how to do this.

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采纳的回答

Image Analyst
Image Analyst 2016-12-30
Here's one semi-vectorized way:
a=[17 56 42 12 12 99 102 45 76 76 41 99 12 45 56 17 76 86 125 160 36]
uniquea = unique(a)
labels = 1 : length(uniquea)
for k = 1 : length(a)
index = find(a(k) == uniquea);
a1(k) = labels(index);
end
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Image Analyst
Image Analyst 2016-12-30
My code gives
a1 =
Columns 1 through 17
2 7 5 1 1 10 11 6 8 8 4 10 1 6 7 2 8
Columns 18 through 21
9 12 13 3
Tell me which elements are not in the same order as the a1 you gave, which is a1 = [2 7 5 1 1 10 11 6 8 8 4 10 1 5 7 2 8 9 12 13 3]
I'm just not seeing any difference between my output and yours so I need you to point it out to me. Which indexes are bad?
Jay Hanuman
Jay Hanuman 2016-12-30
编辑：Jay Hanuman 2016-12-30
sorry, it gives right result, I didn't saw clearly, Thank You.

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