Qian cao

Actif depuis 2015

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Question

delete some columns in A and the same columns in another matrix C
Hi all, I have matrix A and C as follows.How to do the function that deletes the columns whose last two values of matrix A are ...

plus de 9 ans il y a | 1 réponse | 0

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Question

rank the columns by the means of nonzero values
Hi all, how can I rank the following matrix A by the rules as following described steps: 1.calculate the mean vector of the nonz...

plus de 9 ans il y a | 1 réponse | 0

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Question

Can anyone help : rank each row of a matrix
Hi all, If I have a matrix like A= 0.2 NaN 0.8 0.8 -0.2 1 0.3 0.2 0.2 -0.3 0.2 2 0.7 -0.1 -0.4 0.7 NaN 0.2 ...

plus de 9 ans il y a | 1 réponse | 0

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Question

rank the values in each row
Hi all, If I have a matrix like A= 0.2 NaN 0.8 0.8 -0.2 1 0.3 0.2 0.2 -0.3 0.2 2 0.7 -0.1 -0.4 0.7 NaN 0....

plus de 9 ans il y a | 1 réponse | 0

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Question

how to plot the time series data with dates showing in x axis
Hi all, I am trying to plot the monthly time series in the same graph with x axis representing month of year and y axis the time...

presque 10 ans il y a | 1 réponse | 0

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Question

plot the time series data
Hi all, I am trying to plot the monthly time series in the same graph with x axis representing month of year and y axis the tim...

presque 10 ans il y a | 1 réponse | 0

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Question

get the sub matrix composed of the three columns with the largest mean values
Hi there, I get a matrix d= 1 3 10 20 34 2 4 9 21 32 2 2 7 23 34 1 5 6 14 39 What I need to do is to first...

presque 10 ans il y a | 1 réponse | 0

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Question

how to use if when there is NAN
Hi all I have a time series price matrix as follows. At each time, I need to judge if the current price is larger than the av...

presque 10 ans il y a | 1 réponse | 0

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Question

How to do ARMA regression with non available values
HI,the two matrix are time series data. One is return and the other is named MAprice. how to conduct arma model( inc. error an...

presque 10 ans il y a | 1 réponse | 0

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Question

arma regression with NAN
HI,the two matrix are included as attached . rows represent time series. how to conduct arma model( inc. error and intercept te...

presque 10 ans il y a | 1 réponse | 0

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Question

count the number of new listings and delistings across time
Dear there, Happy Christmas. Could you gift me by helping me to solve my problem:) haha. I have the following price matrix, ...

presque 10 ans il y a | 1 réponse | 0

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Question

how to get the matrix of the ARMA coefficients?
Dear all, I have been working on this for long but still cannot manage it. Could you help me ? I have two matrix, one is Mauric...

presque 10 ans il y a | 1 réponse | 0

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Question

momentum strategy based on trend
Hi, I have a dataset as attached. The columns represent stocks, the rows representing time. The values are the lag 3 moving ave...

presque 10 ans il y a | 1 réponse | 0

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Question

delete all zero columns and the same columns in another matrix
Hi all, I have two simplified matrixes that I need to cope with. A=[0 1 0 1;0 4 0 1; 0 3 0 0; 0 1 0 2 ]; How I delete the col...

presque 10 ans il y a | 1 réponse | 0

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Question

delete the columns with the last two values equal to NAN
Hi all, I have a matrix a=[1 NaN 1 1; 1 1 1 1; NaN NaN NaN 1;NaN NaN 1 NaN ] How to do the function that deletes the co...

presque 10 ans il y a | 1 réponse | 0

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Question

filling the first NaN right after the last non NaN with a value that is half of the non NaN
Hello there, could you help to make the following matrix p = [NaN 2 NaN; 2 4 NaN; 2 6 8; ...

presque 10 ans il y a | 1 réponse | 0

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Question

half the first NaN value after the last non NaN value in each column
Hi, I have a matrix p = [NaN 2 NaN; 2 4 NaN; 2 6 8; NaN 8 2; NaN NaN...

presque 10 ans il y a | 2 réponses | 0

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Question

To calculate portfolio returns
Hi, I have a question regarding the matrix multiplication with NaN cells in the matrix. The two matrix are W1= [0.1 0 0....

presque 10 ans il y a | 1 réponse | 0

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Question

define the 1/K strategy
Hi, I have a matrix B = 0 9 7 0 0 0 9 7 6 0 0 2 7 ...

presque 10 ans il y a | 2 réponses | 0

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Question

how to fill with the last non empty value across each column
Hi all, how can I fill the cells in each row with the last non empty or non zero value please? For example : the matrix is [0 ...

presque 10 ans il y a | 1 réponse | 0

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