[R] Strange subvector output --> x[n] != x[1:n][n]

[Gewart]

Hi, Can anyone explain what is going on...!?   For a vector
"x=seq(min,max,0.01)", when generating sub-vector "a" based on a starting
value "st", things go as expected as long as "st" is not too close to the
beginning of "x".  For example, if x starts at -5 and increments by 0.01,
whenever I try to generate the sub-vector "a" (as below) with a starting
value of 0.49 or less it does not generate the expected output: The initial
value of "a" is wrong.
 
Thanks in advance for any clarity you can shed.
Gary

...(please see two versions of code below).... 

#THIS WORKS...(st > -4.9)

	min = -5; max = 1;  x=seq(min,max,0.01)

	st= -4.8 ; end= 0    

	a=x[((st-min)/0.01+1):((end-min)/0.01+1)] 
	
			n=(st-min)/0.01+1
#compare	
	a[1:10]; c(x[n:(n+9)])

#test...
	n
	x[1:n]; x[n]           ### x[n]== x[1:n][n] ; As expected
##########################################################
#  BUT THIS IS WEIRD!!...(st <= -4.9)
	
	st= -4.90 ; end= 0     ### -> BUG in generation of a!!

	a=x[((st-min)/0.01+1):((end-min)/0.01+1)]; 
	
			n=(st-min)/0.01+1
#compare	
	a[1:10]; c(x[n:(n+9)])
#test
	n
	x[1:n]; x[n]  ### NOW x[n] != x[1:n][n]   !!?? What is going on!?





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