[R] heat map labeling

[Angela]

Hello,

I have a dataset of 985 genes, looks something like the ones below. I want to label only those with the high intensities, since labeling all doesn't show up. Is there a way to do that? If not, is there a way to pull out the highest ones (say, highest 50, or those above X amount) and only show those in a heat map? Thanks!

-Angela

Z transforming gives all cells the same value, just + or - (for example, all have 0.5 and -0.5). The researchers want the actual values used.

Gene   var1       var2
A    8000000    0
B    250000    300000
C    750000    2000000
D    0            0
E    4000000    6000000
E    5000000    700000
E    1000000    1000000
F    6000000    6000000
F    700000    827460
G    420930    400000
H    0            0
H    1000000    1000000
I    700000    600000
J    0            700000
K    0            0
L    200000    500000
L    1000000    3000000