how to find difference between column elemnts in a matrix ?

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aditya sahu 2017-6-13

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https://ww2.mathworks.cn/matlabcentral/answers/344512-how-to-find-difference-between-column-elemnts-in-a-matrix

编辑： Stephen23 2017-6-14

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Let my matrix is

  2      14      5
  1      8       9
 11     12     13

I need to find the substraction between column 1 and 2 and store the result in coulmn 1. similarily for coulmn 3 and 4 and result will be in coulmn 2. i.e the result should be like this

  9
 -1
 -1

kindly, suggest solution. Thank you.

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Stephen23 2017-6-13

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编辑：Stephen23 2017-6-14

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A general solution (without hard-coded columns):

>> M(:,1:2:end) - M(:,2:2:end)
ans =  
   1   9
   6  -1
   0  -1

EDIT: if you have uint8 image data, then convert to double first:

double(M(:,1:2:end)) - double(M(:,2:2:end))

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Walter Roberson 2017-6-13

double(M(:,1:2:end)) - double(M(:,2:2:end)) would run less risk of overflowing datatypes

aditya sahu 2017-6-14

Thank you @walter-roberson and @Stephen Cobeldick ,,i got it...my matrix was actually uint8 and i am expacting negative, sorry for my mistake..but thank you for your suggestion...

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