Collection of Java/JEE resources

SureshDevang Site : A to Z of Java topics

Java Class Loader Architecture - One of the best

The WebSphere 4.0 class loading architecture

For Scala

How your stock order get routed and filled?

How your stock order get filled

INTEL'S BUSINESS PLAN FROM 1968"

INTEL'S BUSINESS PLAN FROM 1968"

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ICE NYSE Merger

ICE agrees NYSE Euronext takeover - FT.com

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Why an Atlanta Upstart Is Buying NYSE (It's Not Stocks).

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CME is Hit with a Challenge WSJ.com

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NYSE suitor, ICE's Sprecher known for timely buys

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NYSE Bell Tolls for Exchange That Fell Behind - Bloomberg

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ICE Has Expanded Aggressively - WSJ.com

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Niederauer's Tenure Marked by Profound Change - WSJ.com

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NYSE, ICE Deal About Everything but Stocks

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Sprecher, a 'Chess Master' With Sharp Elbows - WSJ.com

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Libor Scandal

WSJ Analysis Suggests Banks May Have Reported Flawed Interest Data for Libor
"Confidence in Libor matters, because the rate system plays a vital role in the global economy. Central bankers follow it closely as a barometer of the banking system's health, and to decide how much to adjust interest rates to keep their economies growing. Payments on nearly $90 trillion in dollar-denominated mortgage loans, corporate debt and financial contracts rise and fall according to Libor's movements."

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Missteps on Libor Doomed Barclays's Leaders
"Mr. Diamond's downfall may have been hastened because the U.S.-born investment banker, who became chief executive at the start of 2011, had never won acceptance by Britain's political and financial establishment. When the rate-fixing scandal erupted, Mr. Diamond had few allies."

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R Basics

R object types

Here, for more experienced users, is a list of a few of the more important object types.

Vector:

a one-dimensional array of arbitrary length. Subsets of the vector may be referenced. All elements of the vector must be of the same type--numerical, character, etc.

Matrix:

a two-dimensional array with an arbitrary number of rows and columns. Subsets of the matrix may be referenced, and individual rows and columns of the matrix may be handled as vectors. Again all elements of the matrix must be of the same type.

Array:

as a matrix, but of arbitrary dimension.

Data frame:

a set of data organised similarly to a matrix. However each column of the data frame may contain its own type of data. Columns typically correspond to variables in a statistical study, while rows correspond to observations of these variables. A data frame may be handled similarly to a matrix, and individual columns of the data frame may be handled as vectors.

Function:

see Section .

List:

an arbitrary collection of other R objects (which may include other lists).

R reference

How can I read command line parameters from an R script?

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I've got a R script for which I'd like to be able to supply several command-line parameters (rather than hardcode parameter values in the code itself). The script runs on Windows. I can't find info on how to read parameters supplied on the command-line into my R script. I'd be surprised if it can't be done, so maybe I'm just not using the best keywords in my Google search... Answer: I made two files: exmpl.bat and exmpl.R. exmpl.bat: set R_Script="C:\Program Files\R-3.0.2\bin\RScript.exe" %R_Script% exmpl.R 2010-01-28 example 100 > exmpl.batch 2>&1 Alternatively using Rterm.exe: set R_TERM="C:\Program Files\R-3.0.2\bin\i386\Rterm.exe" %R_TERM% --no-restore --no-save --args 2010-01-28 example 100 < exmpl.R > exmpl.batch 2>&1 exmpl.R: options(echo=TRUE) # if you want see commands in output file args <- span=""> commandArgs(trailingOnly = TRUE) print(args) # trailingOnly=TRUE means that only your arguments are returned, check: # print(commandsArgs(trailingOnly=FALSE)) start_date <- span=""> as.Date(args[1]) name <- span=""> args[2] n <- span=""> as.integer(args[3]) rm(args) # Some computations: x <- span=""> rnorm(n) png(paste(name,".png",sep="")) plot(start_date+(1L:n), x) dev.off() summary(x) Save both files in the same directory and start exmpl.bat. In result you got: example.png with some plot exmpl.batch with all what was done Just to add - you could add environment variable %R_Script%: "C:\Program Files\R-3.0.2\bin\RScript.exe" and use it in your batch scripts as %R_Script% ....... Differences between RScript and Rterm: Rscript has simpler syntax Rscript by-self choose architecture on x64 (see R Installation and Administration, 2.6 Sub-architectures for details) Rscript need options(echo=TRUE) in R-file if you want write commands to output file

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Econometrics in R

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