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Select the max & min values in multi index Matrix

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burcu bilgic
burcu bilgic 2021-11-8
评论： Image Analyst 2021-11-9
I have a matrix with repetitive values in x and y
for examle:
161 436
161 437
161 523
161 523
162 281
162 457
162 678
I want to find max and min values for every x, for example in this case, I want to end up with two different matrix where I have minimum and maximum values. For examle
min matrix:
161 436
162 281
and max matrix will be
161 523
162 678
each x value is an index and I want to find the min and max value corresponding to that index seperately
Thank you :)

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回答（1 个）

Image Analyst
Image Analyst 2021-11-8
Ran in:
You can use splitapply:
m=[161 436
161 437
161 523
161 523
162 281
162 457
162 678];
groupID = findgroups(m(:, 1))
groupID = 7×1
1 1 1 1 2 2 2
minMatrix = splitapply(@min, m, groupID)
minMatrix = 2×2
161 436 162 281
maxMatrix = splitapply(@max, m, groupID)
maxMatrix = 2×2
161 523 162 678
  2 个评论
Image Analyst
Image Analyst 2021-11-9
Then could you please click the "Accept this answer" link? Thanks in advance. 🙂

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