Graphics Reference
In-Depth Information
Figure
.
.
Sectional displays for the permuted gene distance map. Only distances smaller than the
threshold, є, are displayed
Sectional Display
15.4.3
he purpose of a sectional display is to exhibit only those numerical values that sat-
isfycertain conditions inthedataortheassociatedproximitymaps.Forexample,one
can choose to ignore the values below some threshold by not displaying the corre-
spondingcolordots.Forapermuteddistancemap,onecanemphasizemorecoherent
neighboring structure by displaying only the corresponding neighbors dynamically.
Figure
.
shows a series of such sectional displays (in grey scale) for the distance
matrix for the genes in Fig.
.
, right panel (and Fig.
.
, let panel).
Restricted Display
15.4.4
Outlying data pointsorproximitymeasurescanmaskdetailed colorresolutions. his
situationcanbeimprovedbydisplayingonlyrankconditionsinsteadoforiginalmag-
nitudes, orbycompressing the color spectrumtorepresentonly the main bodyof the
data values, i.e., one displays data values that fall within some range of the data us-
ing the whole color spectrum. Figure
.
, let panel, shows a restricted display of
Fig.
.
with an artificial outlier observation added. he relatively large distance of
this outlier from the other observations causes the color spectrum to mask the main
Figure
.
.
Original (let)andrestricted(right) displays for the permuted gene distance map in
Fig.
.
with an outlying gene added
