[Linux] difference between g++ and gcc compilers

g++ uses the correct C++ linker options whereas gcc uses the C linker options (so you may get undefined references, etc.)

[R] I/O and Basic Array Implementation

# read txt file
data <- read.table("*.txt")

# Array initialization
for 2D matrix,
 a <- matrix(NA,nrow=360,ncol=720);
for 3D matrix,
a <- array(NA,dim=c(360,720,100));