@nm 

thank you a lot

this is part of my code. i have different number in rest of my code

@vv 

thank you a lot 

@Carl Love 

thank you so much sir

@Kitonum 

thanks alot.

@nm sure. thank you. 

i forget it

@Kitonum great. thank you 

@mmcdara thank you so much

@tomleslie 

thank you soooooooooo much  thats very help me . Thanks a lot

@Joe Riel 

thank you 

@Joe Riel 

thanks for answer

first column is time second columns is acceleration As in the figure below

@Joe Riel 

data in the excel is acceleration . i want to get fourier and power spectra of this deta

@Joe Riel 

thank you very much  thats very help me . Thanks a lot

@Kitonum 

thanks for answer it help me alot

@Christian Wolinski 

wow thank you . but it's a little  difficult for me i try to know it

@Kitonum 

thank for nice answer 

my orginal diffrential equation is nunlinear so i have to solve that with numeric