## Video Categories## Videos | ## Covariance Matrix Of a Random Vector
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## Comments:Author Bruno Antunes (3 years)@armanrainy Thank you for the answer. I got what you told. Actually, my knowledge’s about statistics are not very good. But I solved the problem using another way. I realized that I didn’t need do find the covariance matrix in my case. But, anyway, thank you for the help! Author vickytruong0509 (1 year)thank you, very helpful video Author Natnael Simachew (10 months)Thank you very much. Big point few words and few minutes. Author Mohan Vamsi (1 year)Thank you that was very useful Author armanrainy (3 years)@tritile Hi(sorry about my English). I think you didn't get the meaning of random variables. when we say X it means we have several matrices and it makes our data set. for example, X is a 3*1 matrix which means three different experiment results about 3 parameters( like density,temperature,pressure). When we say X it means we have done this experiment N times (so we have n 3*1 matrices) and we want to find the covariance matrix.your matlab result is caused by having just 1 observation. Author Bruno Antunes (4 years)@npatwari I'm sorry to bother you For example, I have the vector V=[ 2; 3; 5] so I'll make my matrix M=[2 3 5; 2 3 5; 2 3 5] and then cov(M)? I guess I dind't understand what you mean, because I tried this way and MatLab gave me one matrix filled by zeros I'd be glad if you help me thanks Author slatun (3 years)You are GOD !!! Author maeseloger (2 years)That is some godlike pulse you have to be able to write this with a mouse in Paint... Author Bruno Antunes (4 years)Do you know how to use this function on MatLab? I'm trying to find the covariance of a vector, but it gives me a single number, not a matrix Author Neal Patwari (4 years)@tritile You need many realizations of that vector in order to estimate the covariance matrix. So, however you measured or came up with that one vector, do it N times, and then send the cov() function all of the realizations of the random vector together (in a matrix). Then Matlab will return a covariance matrix. ## Embed Video: | ## Search Video## Top Videos |