# I have 200 by 4 matrix represents thicknesses and need to calculate the corresponding depths (will be also 200 by 4 matrix)

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Moustafa Abedel Fattah on 9 Apr 2022
Commented: Sam Chak on 9 Apr 2022
the rows represents the thicknesses and columns represents wells (boreholes).
assuming thicknesses h1, h2, h3, and h4 in first row in thicknesses matrix
then the depths sholuld be z1= h1, z2 = h1+h2, z3 = h1+h2+h3, and z4 = h1+h2+h3+h4 in first row in depth matrix
thanks in advance
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### Accepted Answer

Voss on 9 Apr 2022
% a random 10-by-4 matrix of thicknesses
% each element between 1 and 15:
h = randi(15,10,4)
h = 10Ã—4
1 15 13 11 14 10 9 5 7 3 1 5 12 12 4 11 2 12 14 14 14 14 10 7 9 15 3 5 7 15 7 12 7 1 4 9 3 8 8 7
% depth is cumulative sum along rows of h:
z = cumsum(h,2)
z = 10Ã—4
1 16 29 40 14 24 33 38 7 10 11 16 12 24 28 39 2 14 28 42 14 28 38 45 9 24 27 32 7 22 29 41 7 8 12 21 3 11 19 26
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Sam Chak on 9 Apr 2022
Maybe Dr. Underscore. ðŸ˜„

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