Column operation : cosne and sine operation Post: 302451670

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Top Forums Shell Programming and Scripting Column operation : cosne and sine operation Post 302451670 by shashi792 on Tuesday 7th of September 2010 05:37:38 PM

09-07-2010

Registered User

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 .

file.txt

Code:

900.00000               1           1           1
   500.00000    
   500.00000    
  100000.000    
      4
      4
  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

Code:

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

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

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LEARN ABOUT FREEBSD

colrm

COLRM(1)						    BSD General Commands Manual 						  COLRM(1)

NAME

     colrm -- remove columns from a file

SYNOPSIS

     colrm [start [stop]]

DESCRIPTION

     The colrm utility removes selected columns from the lines of a file.  A column is defined as a single character in a line.  Input is read
     from the standard input.  Output is written to the standard output.

     If only the start column is specified, columns numbered less than the start column will be written.  If both start and stop columns are spec-
     ified, columns numbered less than the start column or greater than the stop column will be written.  Column numbering starts with one, not
     zero.

     Tab characters increment the column count to the next multiple of eight.  Backspace characters decrement the column count by one.

ENVIRONMENT

     The LANG, LC_ALL and LC_CTYPE environment variables affect the execution of colrm as described in environ(7).

EXIT STATUS

     The colrm utility exits 0 on success, and >0 if an error occurs.

SEE ALSO

     awk(1), column(1), cut(1), paste(1)

HISTORY

     The colrm command appeared in 3.0BSD.

BSD
								  August 4, 2004							       BSD

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