## User: vincentpailler

vincentpailler •

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#### Posts by vincentpailler

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... Thanks for your answers. I will stay with my first matrix from which I will extract the correlations I want. ...

written 4 hours ago by
vincentpailler •

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... Actually, my correlation matrix is very huge (up to 5To) . My input file has ~800.000 rows . I can't execute my code on this input file, it requires too much RAM. I will split this input file into several submatrices, then I will compute the correlations on these submatrices. ...

written 4 hours ago by
vincentpailler •

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... I know what you mean. But you also mean that it is impossible to compute directly the upper or the lower triangle on my first matrix?
I necessarily need to create another matrix to the dimensions of my first matrix (`res <- matrix(NA,ncol(data),ncol(data))`), and then compute the correlations an ...

written 19 hours ago by
vincentpailler •

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... Thanks for your answer. But in your code, you need to create a matrix before, right? `res <- matrix(NA,ncol(data),ncol(data)`
I was asking if it could be possible to compute directly the upper or the lower triangle on my initial matrix, without creating another one before? ...

written 1 day ago by
vincentpailler •

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... My goal here is to gain time. So, if I fill the upper or the lower part with 0 , and is I compute the correlations on the other part, do I will gain time? ...

written 1 day ago by
vincentpailler •

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... I read some documentation about the functions *upper.tri* and *lower.tri* but I don't know if it could suitable in this code? ...

written 1 day ago by
vincentpailler •

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... Sorry for the lack of information. I answered above. ...

written 1 day ago by
vincentpailler •

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... > put in the original question ...

written 1 day ago by
vincentpailler •

**50**• updated 1 day ago by Nicolas Rosewick ♦**7.4k**0

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... It is correlations between OTUs ...

written 1 day ago by
vincentpailler •

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... Hi guys,
I would like to know if it is possible to compute the half of a correlation matrix? I mean, I don't want to compute the whole matrix, and then extract just the upper or the lower half - I want to get directly the half matrix?
I use R. I have already a code but it gives the whole matrix : ...

written 1 day ago by
vincentpailler •

**50**• updated 1 day ago by Nicolas Rosewick ♦**7.4k**#### Latest awards to vincentpailler

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