edited-error in calculating mid point

2012 1 11
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Sorry my matrix is
28 45781 5 0 0 13
31 77516 7 0 0 16
37 83311 9 0 0 40
in my previous post i did not edit give the matrix form correctly
please help
http://www.mathworks.in/matlabcentral/answers/25842-error-in-calculating-mid-point

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Walter Roberson
Walter Roberson 2012-1-11
Duplicate is at http://www.mathworks.com/matlabcentral/answers/25842-error-in-calculating-mid-point

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Andrei Bobrov
Andrei Bobrov 2012-1-11

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K = [28 45781 5 0 0 13
31 77516 7 0 0 16
37 83311 9 0 0 40];
F_mid1 = conv2(K,[1 1;1 1]/4,'valid')
OR
F_mid2 = conv2(K,[1 1]/2,'valid')
OR
F_mid3 = conv2(K,[1; 1]/2,'valid')
Choose your variant!

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kash
kash 2012-1-11
but andrei the midpoint is
29 61648.5 6 0 0 14.5
34 80413.5 8 0 0 28
bur i get different answer as per ur code
kash
kash 2012-1-11
F_mid2 = conv2(K,[1; 1]/2,'valid')
i get answer as per this
but my first value ans is 29.5
i need exact value for future calculation
kash
kash 2012-1-11
i that i get only 29
kash
kash 2012-1-11
my row sizw will increase i have given matrix for example
Andrei Bobrov
Andrei Bobrov 2012-1-11
Hi Kash! Try this is:
>> format short g;
>> F_mid3 = conv2(K,[1; 1]/2,'valid')
This you need?
kash
kash 2012-1-11
thanks a lot andrei
Walter Roberson
Walter Roberson 2012-1-11
I had proposed that 2 days before in http://www.mathworks.com/matlabcentral/answers/25618-error-using-conv
"If you want 2D convolution, then use a 2D convolution function such as conv2(), probably with [0.5 0.5].' as your kernel"
Notice that [0.5 0.5].' is [0.5; 0.5]

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