sum all successive values in matrix row

I have a vector A which represents 10 machines defect rate. Matrix B shows a process plan in each row in which the elements show process time of one part on corresponding machine for example; row 1 col 4 shows that this part takes 9 minutes to process on machine 4.I want to multiply each row of B with A such that every non zero element of B is multiplies by the sum of corresponding non zero elements of A. for example;

A=[0.1, 0.2, 0.2, 0.4, 0.2, 0.3, 0.1, 0.1, 0.1, 0.2]
  B=[0 0 0 9 0 0 10 0 8 8;
     8 0 0 0 7 9 0 0 0 10]

C=[0 0 0 (9+9*(0.4+0.1+0.1+0.2)) 0 0 (10+10*(0.1+0.1+0.2) 0 (8+8*(0.1+0.2)) 8+8*0.2;
(8+8*(0.1+0.2+0.3+0.2) 0 0 0 (7+7*(0.2+0.3+0.2) (9+9*(0.3+0.2)) 0 0 0 (10+10*(0.2))]

I tried cumsum and move sum but they are not giving the right answer.

[Geoff Hayes]

summyia - how are you deciding which element of A to sum (since A is a 1x10 array)?

[summyia qamar]

A is 1x10 and B is 2x10 so each row of B is compared with A. starting from row 1, 4th element of B is non zero so it is multiplied with A 4th element of A in such a way that all the successive elements of A corresponding to non zero elements of B are added and then multiplied with B.

[summyia qamar]

non zero elements of B are 4th, 7th 9th and 10th so these elements of A are added and multiplied with 4th element of B. then for 7th element; 7 9 and 10th elements of A are added and them multiplied with 7th element of B

Answer 1

[Matt J]

map=(B~=0);

C=cumsum(map.*A,2,'reverse').*B+B

[summyia qamar]

yes this worked. thankyou sir

Answer 2

[Geoff Hayes]

summiya - for the seventh element, you seem to have

 (10+10*(0.3+0.1+0.2)

Is the 0.3 a mistake and so should be 0.1 instead?

Regardless, if we assume that B has integers only, then we can determine the indices of the non-zero elements of the first row of B with

 nonZeroElementsInB = B(1,:) ~= 0;

We can then determine the sum (from A) of these non-zero elements as

 sumNonZeroElementsInA = sum(A(nonZeroElementsInB));

So this will be the sum of all the elements of A corresponding to non-zero elements in the first row of B

 (0.4+0.1+0.1+0.2)

You will need to adjust this sum for those elements where you don't want to include all of these values.

[summyia qamar]

yes thank you for correction.I corrected 0.3 error in question