@Carl Love 

i will attach a maple file containing two lines only:

B:=ImportMatrix("A.txt")

plot(B(..,1),B(..,2))

In my maple 15 it is giving me a straight line 

try just opening the file without executing it and you will see my straight line 

why i am having this plot i really dont know is it a bug in my maple version 

Download testplot.mw

@Carl LoveDear you have misunderstood the problem her and i think it is my fault 

what i have meant not the view window but the different pattern given in the two plots

in the kgraph i am getting an oscillating signal and in the maple i am getting a line with negative slop

have you tried to plot the first column vs second column from the raw data file can you please post your plot

@Carl Love 

the raw data file was generated by maple using the ExportMatrix of a matrix A(1002,5)

ExportMatrix("A.txt",A)

plot(A(..,1),A(..,2))

@Christopher2222 

is the signal processing package found in Maple 15