how to add and substract manually in a matrix?

I have a matrix like

A=[1   1  0.7 1
   0.7 1  1   1
   1   1  0.7 1]

now i want to addition of each column to be 3 so in first column its total is 2.7. where 3-2.7 = 0.3. i want to divide this 0.3 in rest 1 that is 0.15 to 1st element A(1,1) and A(3,1). same wise i want to do for each column. how shall i do that...plz plz help me....

[James Tursa]

Please show the complete expected result for your example. Do you only want to add to the 1's and not the 0.7's?

[Nitin]

Are you trying to nomalize here?

[suchismita]

no actually...its a part of my phd work...that i have to check whether i can do this type of manipulation in matlab

Answer 1

[Azzi Abdelmalek]

A=[1   1  0.7 1
  0.7 1  1   1
  1   1  0.7 1]
s=3-sum(A);
ii=A==1;
jj=sum(ii);
a=s./jj;
b=bsxfun(@times,ii,a);
b(isnan(b))=0;
B=A;
k=b~=0;
B(k)=A(k)+b(k)

[suchismita]

i have a doubt if i want to edit this same example and assume that after the calculation of 1st column, 2nd column will be calculated from the first....as the subtracting and adding will be done on the value of the previous column.

as for example:

B=[1.15 1.15 0.85 0.85; 0.7 0.7 1.3 1.3; 1.15 1.15 0.85 0.85]