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Imperial College

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The most efficient way to add a new column or new row to a sparse matrix
Hi, suppose I have a large scale sparse matrix A, i.e. size(A)=[100k,10k]. I am wondering, what is the most efficient way to app...

mer än 8 år ago | 2 answers | 0

2

answers

Question

Which Techniques that ARIMA is using for estimating the AR and MA parameters?
Hi, Does anyone know that which techniques the ARIMA command is using for estimating the AR and MA parameters? Can anyone give m...

ungefär 9 år ago | 0 answers | 0

0

answers

Question

Combine cell array with contant matrices
Hi everyone, Suppose I have a cell array A{1} A{2} A{3} ... A{n}, can I create a new cell array A_{1} A_{2} A_{3} ... A_{n}...

mer än 9 år ago | 2 answers | 0

2

answers

Question

Question about choosing an initial state error covariance for Kalman filter
Hi Everyone, I have a Kalman filter code from internet, which estimates states of following state space system: x(k+1)= A ...

mer än 9 år ago | 0 answers | 0

0

answers

Question

Creat a positive definite matrix, which way is better?
Hi everyone, Suppose I have a positive definite matrix P and a non-singular matrix A, I realised there is a small numerical d...

nästan 10 år ago | 1 answer | 1

1

answer

Question

How to create a square matrix with consecutive numbers on each row?
Hi everyone, Given a vector i.e. n=[1 12 25 78], is there any way to create a matrix A, such that A=[ 1 2 3 4; 11 1...

ungefär 10 år ago | 2 answers | 0

2

answers

Answered
Problem of saving .fig file as .pdf file
does anyone know?

mer än 10 år ago | 0

Question

Problem of saving .fig file as .pdf file
Hi, everyone I need to save .fig file as .pdf file. Previously, I used command set(gcf,'PaperOrientation','landscape'); s...

mer än 10 år ago | 1 answer | 0

1

answer

Question

MATLAB 2014a cannot enable parpool
Hi, I tried to enable parpool in MATLAB 2014a, it gives following message Error using parpool (line 99) The operation must mod...

mer än 11 år ago | 1 answer | 0

1

answer

Question

How to construct this matrix without loop?
Hi, everyone: suppose I have a vector x=[a b c d e f g h ... z]. Is it possible to construct a matrix such that: X=[a b c...

nästan 12 år ago | 2 answers | 0

2

answers

Question

How to construct this vector without loop?
Hi, everyone: I was wondering, is it possible to construct following vector without for loop? A=[1 2 3 1 2 3 4 5 6 1 2 3 4...

ungefär 12 år ago | 3 answers | 0

3

answers

Question

Construct product of matrices without for loop
Hi, everyone: Suppose A is a 2 by 2 by N matrix, is it possible to construct a matrix B, such that: B=[Prod(A)_1^{N-n}...

ungefär 12 år ago | 1 answer | 0

1

answer

Answered
Construct Power of Matrix without for loop
Thanks very much! Do you know if A is a 2 by 2 by N matrix, can I use "arrayfun" or any other way to do: B=[A(:,:,1), A(:,...

ungefär 12 år ago | 0

Question

Construct Power of Matrix without for loop
Hi, everyone: Suppose I have a 2 by 2 matrix A, if I want construct a larger matrix B that is defined as: B=[A, A^2, A^3, ...

ungefär 12 år ago | 3 answers | 0

3

answers

Question

Positive Semi-definite Matrix Problem
Suppose I have a large M by N dense matrix C, which is not full rank, when I do the calculation A=C'*C, matrix A should be a pos...

ungefär 12 år ago | 2 answers | 0

2

answers

Question

How to parallel run 2 different functions?
Hi, everyone: Suppose I have two functions called P2 and P3, each function will run N times using for-loop and P2(t=k) requir...

mer än 12 år ago | 0 answers | 0

0

answers

Answered
How to transfer a sparse matrix into a block diagnal matrix efficiently?
Thank you very much Cedric, you are a genius and super kind!

mer än 12 år ago | 0

Question

How to transfer a sparse matrix into a block diagnal matrix efficiently?
Hi, Everyone: Suppose I have a very large M*N sparse matrix A, where M=K*N, I need to equally split it into K N*N matrices an...

mer än 12 år ago | 2 answers | 0

2

answers

Question

Large Sparse Matrix Summation
Hi, Everyone: Suppose I have a very large M*N sparse matrix A, where M=K*N, I need to equally split it into K N*N matrices a...

mer än 12 år ago | 2 answers | 0

2

answers

Question

Construct a large sparse matrix
Hi, everyone I am currently constructing a very large sparse square matrix which is made by several smaller sparse matrices, ...

mer än 12 år ago | 1 answer | 0

1

answer