how to add the first row all the odd columns by step of 2 odd columns

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juveria fatima 2018-9-1

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https://ww2.mathworks.cn/matlabcentral/answers/417083-how-to-add-the-first-row-all-the-odd-columns-by-step-of-2-odd-columns

编辑： Image Analyst 2018-9-1

I want to add 1 and 3 the 2 and 1. Then moving to second row I want to add 1 and 1 then 4 and 5. Similarly I want to, in general, using using loop for an image

a = [...    
       1     2     3     1
       1     4     1     5
       5     8     5     9
       1     9     2     1]

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madhan ravi 2018-9-1

What’s your required output ? Can you give an example?

juveria fatima 2018-9-1

i want to add first column with third ,then fifth column to be added with seventh in short (i want to add all the odd columns) then even columns to added

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采纳的回答

madhan ravi 2018-9-1

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https://ww2.mathworks.cn/matlabcentral/answers/417083-how-to-add-the-first-row-all-the-odd-columns-by-step-of-2-odd-columns#answer_334993

编辑：madhan ravi 2018-9-1

在 MATLAB Online 中打开

Try this:

a1=a(:,1:2:end) %for odd columns 
a2=a(:,2:2:end) %for even columns
oddcolumns=sum(a1,2)
evencolumns=sum(a2,2)
a

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madhan ravi 2018-9-1

Check the updated code.

juveria fatima 2018-9-1

在 MATLAB Online 中打开

consider this as encoding code where a is encoded as odd columns and even columns

        a=[1 2 3 1;1 4 1 5;5 8 5 9;1 9 2 1]  
        a1=a(:,1:2:end) %for odd columns 
        a2=a(:,2:2:end) %for even columns
        oddcolumns=sum(a1,2)
        evencolumns=sum(a2,2)

now i want its inverse i.e decoding back to a ( output should be a )

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