Message-ID: <6.1.2.0.0.20050421144052.01c9a3d8@webmail.uk-koeln.de>
Date: 2005-04-21T15:19:45Z
From: Thomas Zander
Subject: heatmaps depending on RAM?
I have the following problem. Analysing affymetrix data I calculated
euclidean distances between samples and visualized the results in a
heatmap. Prior data were vsn normalized.
heatmap(as.matrix(dist(t(exprs(TGF_eset.vsn[(tvlist),])))), col=colourRamp)
Depending on the memory I assign to R (512MB, 1024MB, 1536MB) I get
slightly different results. Exactly the same scripts were used. Although
main results remain in the detail I have differences. Is there any
explanation for these results?
thanks for the help
Thomas Zander
Dr. Thomas Zander
MTBTI, HS16UG
Dept. of Internal Medicine I
Universit??tsklinik K??ln
Joseph-Stelzmannstr. 9
D-50924 K??ln
Germany
Tel.: +49-221-4784447/ 4785413
Fax: +49-221-4783647
Thomas.Zander at uk-koeln.de