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...at affect the margins and so on, and I haven't tried the right combination yet. Any advice would be appreciated. Thanks much, David L. Reiner, Ph.D. Head Quant XR Trading LLC 550 West Jackson Boulevard, Suite 1000 Chicago, IL 60661-5704 (312) 244-4610 direct (312) 244-4500 main David.Reiner at xrtrading.com This e-mail and any materials attached hereto, including, without limitation, all content hereof and thereof (collectively, "XR Content") are confidential and proprietary to XR Trading, LLC ("XR") and/or its affiliates, and are protected by intellectual property laws. Wi...

I'm trying to use sqdf's function read.csv.sql to read CSV files in which the missing values are represented by NA's. Plain old read.csv works fine on these files, but they are rather large and I'd like to filter using sql-like statements. However, even if I specify field.types correctly and nrows=-1, it still turns the columns with NA's into chars or 0. I'm trying to make

I'm working with some old code that worked under R 2.15.3 but gives an error under 3.0.0 and 3.0.1 : > 1.0 - .C("psmirnov2x", p = as.double(10.0), as.integer(1000), as.integer(1000))$p Error in .C("psmirnov2x", p = as.double(10), as.integer(1000), as.integer(1000)) : C symbol name "psmirnov2x" not in load table I don't understand why that function would