Displaying 2 results from an estimated 2 matches for "term5".
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2010 Nov 10
3
create a pairwise coocurrence matrix
Hi all,
I am trying to construct a pairwise coocurrence matrix for certain terms
appearing in a number of documents. For example I have the following table
with binary values showing the presence or absence of a certain term in a
document:
term1 term2 term3 term4 term5 doc1 1 1 0 0 1 doc2 1 1 0 1 1 doc3 1 0 0
0 1
And I want to have a matrix with the number of the pairwise coocurrencies.
So, based on the above table the matrix should be:
term1 term2 term3 term4 term5 term1 0 2 0 1 3 term2 2 0 0 1 2 term3 0 0
0 0 0
term4
1 1 0 0 1
term5
3 2 0 1 1
Any ideas...
2007 Jan 01
4
Help with filled.contour()
...rst approximation to what I need:
***********************************
mu1 <- 0
mu2 <- 5
s <- 1
x <- seq(-2.5, 7.5, length = 41)
y <- seq(-2.5, 2.5, length = 41)
f <- function(x,y){
term1 <- 1/(2*pi*sqrt(s*s))
term2 <- -1/2
term3 <- (x - mu1)^2/s
term4 <- (y - mu1)^2/s
term5 <- (x - mu2)^2/s
term1*(.5 * exp(term2*(term3 + term4)) + .5 * exp(term2*(term5 +
term4)))
}
z <- outer(x, y, f)
persp(x, y, z)
require(grDevices)
filled.contour(x, y, z, axes = F, frame.plot = F, asp = 1,
col = palette(gray(seq(0, 0.9, len = 25))), nlevels = 25)
**********************...