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Wan-Yi Chiu


Last seen: 9 months ago |  Active since 2018

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How to partition a matrix by sorting a column?
Dear friends: I want to parttion a matrix into two submatrix by sorting the third column: For example, the matrix is as follow...

9 months ago | 2 answers | 0

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answers

Question


How to count the number of the rank in each column of a matrix.
Load a rank matrix 1 2 3; 2 3 1; 2 1 3; 3 1 2; 1 3 2 How do I count the number of the rank in each column: T...

1 year ago | 1 answer | 0

1

answer

Question


Rank the entries of a matrix with codes.
Load a matrix: [12 4 6; 7 3 8; 1 6 5; 9 2 5] How to rank each row relative to columns with codes as: 3 1 2 2 1 3 ...

1 year ago | 1 answer | 0

1

answer

Question


How do count the number under multiple conditions?
I have four numbers (A, B, C, D) that may be different. I would like to count the number such as A=B=C=D, A~=B~=C~=D, or A=B, C=...

3 years ago | 1 answer | 0

1

answer

Question


How do shade different area with specific y interval
My codes are as follows: clear x = 0:0.01:9; y = sqrt(x); plot(x, y) hold on; x = 1:0.01:9; [m n]=size(x) y1=ones(1,n); ...

3 years ago | 1 answer | 0

1

answer

Question


How do I have a loop for different data intervals.
I have a (m by n) matrix, for example: A=rand(m,n) First, I need the operations for the following submatrix (with different le...

3 years ago | 1 answer | 0

1

answer

Question


How to run a for-loop with different dimesions?
Let A be a 20 by 1 array. I can separately compute B_1=mean(A(1:6, 1:1)), B_2=mean(A(7:15, 1:1)), and B_3=mean(A(16:20, 1:...

4 years ago | 1 answer | 0

1

answer

Answered
Can I solve a special system of implicit functions by using the command "fsolve"
Thanks for everyone. I solve the problem.

6 years ago | 0

| accepted

Question


Can I solve a special system of implicit functions by using the command "fsolve"
My system of implicit functions is as follows: where C and D are known vectors, A is a sysmmetric matrix. How can I wri...

6 years ago | 2 answers | 0

2

answers

Question


How to solve a revised quadratic program problem
I need helps for solving the following quadratic maximum problem. The quadprog(H, f, A, b) command is designed for solving: ...

6 years ago | 1 answer | 0

1

answer

Answered
Deleting some columns of matrix and obtain the original column index.
Thank you very much. I have tried the codes offered. However, in my case, I can not get the array [1 3 4] I mean that: ...

6 years ago | 0

Question


Deleting some columns of matrix and obtain the original column index.
Dear friends I need really some help/advice. My problem is stated as follows. The original data is a X=100*50 matrix. The ...

6 years ago | 2 answers | 0

2

answers