edited-error in calculating mid point

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

[Walter Roberson]

Duplicate is at http://www.mathworks.com/matlabcentral/answers/25842-error-in-calculating-mid-point

Answer 1

[Andrei Bobrov]

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!

[kash]

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]

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]

i that i get only 29

[kash]

my row sizw will increase i have given matrix for example

[Andrei Bobrov]

Hi Kash! Try this is:

>> format short g;

>> F_mid3 = conv2(K,[1; 1]/2,'valid')

This you need?

[kash]

thanks a lot andrei

[Walter Roberson]

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]