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Full Discussion: How to create SQRT function in catenate file
Top Forums Shell Programming and Scripting How to create SQRT function in catenate file Post 302150061 by vgersh99 on Monday 10th of December 2007 02:05:02 AM
Old 12-10-2007
Quote:
Originally Posted by ahjiefreak
Hi,

The answer to this question is:-

1. what "t=sqrt($t)' | bc -l " is supposed to do
2. what is the value of 'h' in "t= h*($3+$2);"
I am basically trying to get an operation of two fields of columns $3 and $2 with multiplication of some constant value(h). These operation will end up giving me a number which is t. Then, this t value I would like to get its square root and assign to a new variable.
Where the 'constant' (h) gets assigned it's value?
What do you think the value of '$t' in 'sqrt($t)' is?
Why are you trying "pipe" 'sqrt($t)' into 'bc -l'? Wouldn't a simple 't=sqrt(t)' be enough?
Quote:
Originally Posted by ahjiefreak
Perhaps I should write as "w=sqrt($t)" |bc -l in the first place.

3. What do think the value of $2 and $1 will be in the 'END' block
4. what's the intent of this: count($1)=$2/t
I would like to divide again the field of column 2 with the square root value to associate with field $1. Basically in my case, $1 is unique line number and $2 is just a numeric value for each line in the file a.txt.
'count($1)' looks like a function 'count' taking a parameter with value of '$1'. And you're assigning '$2/t' to the function. This does not make any sense.
DO mean you want to use the associative array indexed by the value of your FIRST '$1' column? Something like that:
Code:
countArray[$1] = $2/t

Quote:
Originally Posted by ahjiefreak
5. why are you doing this 'cat a.txt'
The cat a.txt is bascially I would like to open the file which contains all the numbers and have 3 fields; $1, $2 and $3.

-Jason
The general awk paradigm for 'reading' files is:
Code:
awk '... awk BODY...' myInputFile.

Last edited by vgersh99; 12-10-2007 at 03:18 AM..
 

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LEARN ABOUT DEBIAN

ev

EV(1)							      General Commands Manual							     EV(1)

NAME

       ev - evaluate expressions

SYNOPSIS

       ev 'expr' ..

DESCRIPTION

       Ev  evaluates  expressions  given  on the command line, and sends the results to the standard output, one per line.  An expression contains
       real numbers, function calls, and the following operators:

	    +  -  *  /	^

       Operators are evaluated left to right, except '^', which is right associative.  Powers have  the  highest  precedence;  multiplication  and
       division  are  evaluated  before  addition  and subtraction.  Expressions can be grouped with parentheses.  All values are double precision
       real.

       The following library of functions is available:

       if(cond, then, else)
		 if cond is greater than zero, then is evaluated, otherwise else is evaluated.

       select(N, a1, a2, ..)
		 return aN (N is rounded to the nearest integer).  If N is zero, the number of available arguments is returned.

       rand(x)	 compute a random number between 0 and 1 based on x.

       floor(x)  return largest integer not greater than x.

       ceil(x)	 return smallest integer not less than x.

       sqrt(x)	 return square root of x.

       exp(x)	 compute e to the power of x (e approx = 2.718281828).

       log(x)	 compute the logarithm of x to the base e.

       log10(x)  compute the logarithm of x to the base 10.

       sin(x), cos(x), tan(x)
		 trigonometric functions.

       asin(x), acos(x), atan(x)
		 inverse trigonometric functions.

       atan2(y, x)
		 inverse tangent of y/x (range -pi to pi).

EXAMPLE

       To pass the square root of two and the sine of .5 to a program:

	 program `ev 'sqrt(2)' 'sin(.5)'`

AUTHOR

       Greg Ward

SEE ALSO

       icalc(1), rcalc(1)

RADIANCE
							     10/28/96								     EV(1)
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