search for: multidimentional

Dear R-helpers, I am running metaMDS in the vegan package, which uses isoMDS in MASS, to perform Nonmetric Multidimentional Scaling (NMDS). I have seen some authors report a p-value for the NMDS ordination based on randomization of the dataset. As I understand it this is meant to compare the stress in your dataset to multiple runs of randomized data. I do not see a way to perform such a test in vegan or MASS. So my qu...

...he following: 1. Compute variance of each row 2. Pick top-2 row with highest variance 3. Store those selected rows for further processing To achieve this, I tried to: a) read the table and compute variance for each row, b) append variance with its original row in a vector, c) store a vector into multidimentional array (matrix), d) sort that array. But I am stuck at the step (b). Can anybody suggest what's the best way to achieve my aim above? This is the sample code I have so far (not working). __BEGIN__ #data <- read.table("testdata.txt") # Is this a right way to initialize? all.arr...

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