Text file numerical data in columns (spaces between colums) to graph after averaging each 500 columns values.please help.

i have a text file with numerical data in three columns,(first i need to skip the few lines of text within the file above the three column of data values)then i need to convert the numerical values above "-999" to zero,then take the average of each 500 values in the first column (second and third colum needs the same operation separately),thus found average values are to be stored into a text file and finally plotted in a graph separately. Please help.Its apart of my project work.
Solved!
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Attachments:
data file.txt ‏715 KB

i have a text file with numerical data in three columns,(first i need to skip the few lines of text within the file above the three column of data values)then i need to convert the numerical values above "-999" to zero,then take the average of each 500 values in the first column (second and third colum needs the same operation separately),thus found average values are to be stored into a text file and finally plotted in a graph separately.
" i am attaching the code tht i hv done so far, its for reading and plotting the numerical data from text, but its not working :-( "
Attachments:
read from text and plot.vi ‏26 KB
sample input.txt ‏1 KB
final input to be read and plot.txt ‏345 KB

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