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...responding correlation matrix (x) for this scatterplot. Second, use "seq(along = x)[x > 0.9]" to find the positions of the small pictures with 0.9 correlation, but "seq" can just find the sequence position row by row for the matrix, not a real position (like "rowNumber, colNumber"). Is any function for that? Third, use "Symbols" to plot the circle on these small pictures, but seems it can't do that. Also, I don't know how to adjust the thickness and radius of the circle plotted by "Symbols". Please give me some ideas! Thank you, Shengzhe

Hi, I have a dataset consisting of 350,000 rows and 266 columns. Out of 266 columns 250 are dummy variable columns. I am trying to read this data set into R dataframe object but unable to do it due to memory size limitations (object size created is too large to handle in R). Is there a way to handle such a large dataset in R. My PC has 1GB of RAM, and 55 GB harddisk space running