i have 3 matrices the first one is 3x3 the second is 1x3 the third is 3x2 and i want to build new matrix using the 1st raw of the 1st and the second row of 2nd he 2nd

a = [1 2 3 ;

4 5 6 ;

7 8 9]

b = [7 5 6]

c = [19 23;

31 29;

17 13]

[Voss]

"... the second is 1x3 ... and i want to build new matrix using ... the second row of 2nd [the] 2nd"

The 2nd matrix has no 2nd row.

[KALYAN ACHARJYA]

What would be expected output?

[DGM]

How does the third matrix relate to any of this?

Answer 1

[William Rose]

@fatima haydar ahmad,

You wrote: "i have 3 matrices the first one is 3x3 the second is 1x3 the third is 3x2 and i want to build new matrix using the 1st raw of the 1st and the second row of 2nd he 2nd"

However, the 2nd matrix only has 1 row, so I will assume you meant to write:

"using the first row of a, all of matrix b, and the second column of matrix c as the thrid row of the new matrix"

The code below shows how to do it. Adjust as desired to meet your actual wishes.

a = [1 2 3 ; 4 5 6 ; 7 8 9];
b = [7 5 6];
c = [19 23; 31 29; 17 13];
d=[a(1,:); b; c(:,2)']

d = 3×3

1 2 3 7 5 6 23 29 13

Try the above.