Calculate a mean if two statements are true

I have a matrix that has several rows and columns of data. I am trying to get a mean from all the values of row 6 but only if row 5 = 1 and row 7 = 0. Initially to calculate mean of row 6 if row 5 = 1 I used this:

mean(cellm(6,logical(cellm(5,:))));

Now I would like to add the second portion where row 7 = 0. I have attempted this with the code below:

mean(cellm(6,(find(cellm(7,:) < 1) & (logical(cellm(5,:))))))

But I get the error "Inputs must have the same size.

Any suggestions would be appreciated.

Here is an example of the matrix below:

1  2  3  4  5  6  7  8  9  10
1  2  3  4  5  6  7  8  9  10
4  0  0  0  0  4  4  0  0  0
11  11  11  11  11  22  22  11  11  11
0  1  1  1  1  1  1  1  1  1
1200  1700  1400  1800  1800  417  603  1700  1600  1700
0  1  1  1  1  0  0  1  1  1
1  1  1  1  1  2  2  1  1  1
1  0  0  0  0  0  0  0  0  0

Answer 1

[Joseph Cheng]

you don't need find. you just need to use logical indexing through

 mean(cellm(6,~cellm(7,:) & cellm(5,:)))

which will AND the row5 and the inverse of row7. it'll only do the columns in row 6 where there are ones.

     [~cellm(7,:) & cellm(5,:))]=
                     0     0     0     0     0     1     1     0     0     0
     cellm(5,:)=
                     0     1     1     1     1     0     0     1     1     1
     cellm(7,:)=
                     0     1     1     1     1     1     1     1     1     1

[Daniel]

Fantastic, thank you very much