Matlab how to generate row column and the same random matrix and the number of matrix And the sum is a fixed number, and the fixed number is known

Isn't it magic?

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1. The matrix A = 2 - 1 - 1 1 2 1 - 2 1 4 4 - 6 2 - 2 4 3 6 - 9 7 9 is reduced to the simplest form by elementary row transformation The big God helps A= 2 -1 -1 1 2 ) 1 1 -2 1 4 ) 4 -6 2 -2 4) 3 6 -9 7 9)
2. Using elementary transformation, the inverse matrix of matrix A = {(1,2,3), (2,2,1), (3,4,3)} is obtained A is a third order matrix
3. By using the elementary row transformation of matrix, the inverse matrix of square matrix 2231 - 10 - 121 is obtained
4. Using elementary transformation to find the inverse matrix 1232 - 14011 Using elementary transformation to find the inverse matrix （1 2 3 2 -1 4 0 1 1） 3 * 3,
5. The first line is 120, the second line is 21 - 1, and the third line is 311. It is troublesome to write out the specific calculation process
6. Let a = {010 20-1 341}, I = {100 010 001}, find a + I ^ - 1
7. According to the different values of the parameters, the rank of the first row 1 A - 1 2, the second row 2 - 1 a 5, and the third row 1 10 - 6 1 is obtained
8. The first row is 0,0,0,1, the second row is 0,0,1,1, the third row is 0,1,1,1, the fourth row is 1,1,1,1. Using the elementary row transformation method to find the inverse matrix of the invertible matrix, we need to calculate the whole process I hope you can help me,
9. Find the invertible matrix P and diagonal matrix D, so that p-1ap = D: A, the first row is 3,1,0, the second row is 0,3,1, and the third row is 0.03
10. Using elementary row transformation to find the inverse matrix of a matrix the first row 0 2 - 2 - 4 the second row 1273 the third row 0 32 - 1 the fourth row 1130
11. Matrix row column number representation in MATLAB For example, I is a known matrix with four numbers a, B, C and D How to define that a and B represent line a and line B of I Let C and d represent column C and D of I And then do the calculation? a. B, C and D are not straight elements. For example, a = 100 means that a represents the 100th line of I
12. Matlab loop to get n arrays, how to put these arrays, in the process of loop, n arrays assigned to a matrix that is combined into a matrix? In the loop
13. Please use matlab to generate a 100 * 5 matrix, each row of the matrix is [1, 2, 3, 4, 5]
14. Matlab, known matrix A = [5 7 8 4; 2 1 4 9; 1 3 6 2], B = sort (a, 2), how to find the element of a in B position, thanks
15. Matlab matrix merging (urgent) For example, a = [A1; A2], B = [B1; B2] Merge into C = [A1; A2; B1; B2] Where a1, A2, B1 and B2 are all column vectors We should change ";" to ","
16. Programming to find the sum of all elements on two diagonal lines of a 4 * 4 matrix
17. Solving the matrix equation a = {1 2 3} 3 6 9 2 5 7 1 2 4 rank a=
18. 2, - 1. - 1,1,2,1,1, - 2.1,4, - 6,2, - 2,4,3,6, - 9,7,9 to the row simplest form matrix needs a process of five numbers What is the largest unrelated group?
19. Is this a ladder matrix? 1 2 3 4 0 2 3 4 0 4 5 6 0 6 7
20. The first row is 1,2,3,4, the second row is 0,1,2,3, the third row is 0,0,1,2, the fourth row is 0,0,0,1. By using the elementary row transformation method, the inverse matrix of the invertible matrix is obtained,