[R] to represent color range on plot segment

[karthicklakshman]

Dear R community,

With an advantage of being "NEW" to R, I would like to post a very basic
query here,

I am in need of representing gene expression data which ranges from -0.09 to
+4, on plot "segment". please find below the data df, the expression values
are in df[,2]. kindly help me with the code, so that I can represent the
values with a clear color gradient (something like -0.09 to 0 as red
gradient and 0 to +4 as green gradient)

            location         value
15  chr+:14001-15001  0.99749499
16  chr+:15001-16001  0.99957360
17  chr+:16001-17001  0.99166481
18  chr+:17001-18001  0.97384763
19  chr+:18001-19001  0.94630009
20  chr+:19001-20001  0.90929743
21  chr+:20001-21001  0.86320937
22  chr+:21001-22001  0.80849640
23  chr+:22001-23001  0.74570521
24  chr+:23001-24001  0.67546318
25  chr+:24001-25001  0.59847214
26  chr+:25001-26001  0.51550137
27  chr+:26001-27001  0.42737988
28  chr+:27001-28001  0.33498815
29  chr+:28001-29001  0.23924933
30  chr+:29001-30001  0.14112001
31  chr+:30001-31001  0.04158066
32  chr+:31001-32001 -0.05837414
33  chr+:32001-33001 -0.15774569
34  chr+:33001-34001 -0.25554110
35  chr+:34001-35001 -0.35078323
36  chr+:35001-36001 -0.44252044
37  chr+:36001-37001 -0.52983614
38  chr+:37001-38001 -0.61185789
39  chr+:38001-39001 -0.68776616
40  chr+:39001-40001 -0.75680250
41  chr+:40001-41001 -0.81827711
42  chr+:41001-42001 -0.87157577
43  chr+:42001-43001 -0.91616594
44  chr+:43001-44001 -0.95160207

Thanks in advance,
regards,
karthick



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