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Column operation : cosne and sine operation

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# 1  
Old 09-07-2010
Question Column operation : cosne and sine operation

I have a txt file with several columns and i want to peform an operation on two columns and output it to a new txt file .

900.00000               1           1           1
  1.45257346E-07   899.10834       67.780083      -3.0000000       6.9356270          0      4
  3.36595804E-07   854.32300       67.787216      -2.0000000      -5.6963296          0      4
  4.59328561E-07   764.32300       67.784538       2.0000000      -3.8667135          0      4
  8.10901852E-08   809.10840       67.784058       3.0000000       5.9845576          0      4

I want to consider the first column from line 7
i= complex number exp(ix)= cosx +i sinx , pi =3.14

operation = 1.45257346E-07 * exp (899.10834 * i * pi/180)

general expression = (first column number) * exp (second column number *  i * 0.0174)

# 2  
Old 09-07-2010
Homework? What's the value of i?

awk 'NR>=7 {print $1*exp($2* 3.14/180)}' infile

you can adjust it by add i in it.
# 3  
Old 09-08-2010
No not

Last edited by shashi792; 09-08-2010 at 04:51 AM.. Reason: repeated
# 4  
Old 09-08-2010
No, its no an homework. Its an output file from modelling software, i have to perform the fft and fftshift operation in order to find the channel impulse response.

channel impulse response is given by tht complex number formed in the previous question.
# 5  
Old 09-08-2010
That's fine. So is above code suitable for you?

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