User: mai98ftu@studserv.uni-leipzig.de

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Posts by mai98ftu@studserv.uni-leipzig.de

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Answer: A: colors on heatmap
... Sean, I'm not quite sure what the standard green/black/red color map is but i'm assuming that green means low values, red means high values and black is in the middle? You could define a function which returns colors following that scheme as follows: > my.colors <- function(n = 50, low.col ...
written 16.0 years ago by mai98ftu@studserv.uni-leipzig.de140
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Comment: C: mean of individual rows for subsets of columns in an ExprSet
... There are functions to compute row means or column means that are much faster than using apply(): > mns.col <- colMeans(exprs(eset)[,4:7]) > mns.row <- rowMeans(exprs(eset)[,4:7]) In S-Plus similar functions are available for variance (rowVars, colVars) and standard deviation (rowStdev ...
written 16.1 years ago by mai98ftu@studserv.uni-leipzig.de140
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Comment: C: Defining Weights in marrayNorm.
... I'm not quite sure, if it's true. I changed your example a little bit: > tst <- function(x, y=NULL) x + y > tst(4, y=2) [1] 6 > tst(4) numeric(0) > tmp <- function(x, ...) tst(x, y=NULL) > tmp(4, y=2) numeric(0) > tmp <- function(x, ...) tst(x, y=3) > tmp(4, y=2) [1] ...
written 16.1 years ago by mai98ftu@studserv.uni-leipzig.de140
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Answer: A: question abour background subtraction in RMA
... > What does the word adhoc means? Citing http://www.m-w.com/home.htm: Main Entry: (1) ad hoc Function: adverb Etymology: Latin, for this : for the particular end or case at hand without consideration of wider application Main Entry: (2) ad hoc Function: adjective 1 a : concerned ...
written 16.3 years ago by mai98ftu@studserv.uni-leipzig.de140

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