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Top Forums Shell Programming and Scripting PAssing variables to awk arithmetic Post 302809059 by Don Cragun on Saturday 18th of May 2013 04:25:16 AM
Old 05-18-2013
Note that if you use a Korn shell newer than the 1988 version, you can do this entirely in the shell. Just note that in awk the exponentiation operator is ^ but in ksh arithmetic expansions it is **. The script:
Code:
#!/bin/ksh
IFS=, read var1 var2 < cre
printf "%s\n%s\n%.4f\n" "$var1" "$var2" \
        "$((141*(var1*0.0113/0.9)**-1.209*(0.993)**var2))" > ggh

when the file cre contains:
Code:
89,63

as its first line places the output:
Code:
89
63
79.1984

in the file ggh.

If cre contains thousands of lines like the above, this could easily be converted to a while read loop to process all of the lines in the file:
Code:
#!/bin/ksh
while IFS=, read var1 var2
do      printf "%s\n%s\n%.4f\n" "$var1" "$var2" \
                "$((141*(var1*0.0113/0.9)**-1.209*(0.993)**var2))"
done < cre > ggh

This User Gave Thanks to Don Cragun For This Post:
 

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VAR_EXPORT(3)								 1							     VAR_EXPORT(3)

var_export - Outputs or returns a parsable string representation of a variable

SYNOPSIS
mixed var_export (mixed $expression, [bool $return = false]) DESCRIPTION
var_export(3) gets structured information about the given variable. It is similar to var_dump(3) with one exception: the returned represen- tation is valid PHP code. PARAMETERS
o $expression - The variable you want to export. o $return - If used and set to TRUE, var_export(3) will return the variable representation instead of outputting it. RETURN VALUES
Returns the variable representation when the $return parameter is used and evaluates to TRUE. Otherwise, this function will return NULL. NOTES
Note When the $return parameter is used, this function uses internal output buffering so it cannot be used inside an ob_start(3) callback function. CHANGELOG
+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 5.1.0 | | | | | | | Possibility to export classes and arrays con- | | | taining classes using the __set_state() magic | | | method. | | | | +--------+---------------------------------------------------+ EXAMPLES
Example #1 var_export(3) Examples <?php $a = array (1, 2, array ("a", "b", "c")); var_export($a); ?> The above example will output: array ( 0 => 1, 1 => 2, 2 => array ( 0 => 'a', 1 => 'b', 2 => 'c', ), ) <?php $b = 3.1; $v = var_export($b, true); echo $v; ?> The above example will output: 3.1 Example #2 Exporting classes since PHP 5.1.0 <?php class A { public $var; } $a = new A; $a->var = 5; var_export($a); ?> The above example will output: A::__set_state(array( 'var' => 5, )) Example #3 Using __set_state() (since PHP 5.1.0) <?php class A { public $var1; public $var2; public static function __set_state($an_array) { $obj = new A; $obj->var1 = $an_array['var1']; $obj->var2 = $an_array['var2']; return $obj; } } $a = new A; $a->var1 = 5; $a->var2 = 'foo'; eval('$b = ' . var_export($a, true) . ';'); // $b = A::__set_state(array( // 'var1' => 5, // 'var2' => 'foo', // )); var_dump($b); ?> The above example will output: object(A)#2 (2) { ["var1"]=> int(5) ["var2"]=> string(3) "foo" } NOTES
Note Variables of type resource couldn't be exported by this function. Note var_export(3) does not handle circular references as it would be close to impossible to generate parsable PHP code for that. If you want to do something with the full representation of an array or object, use serialize(3). Warning When var_export(3) exports objects, the leading backslash is not included in the class name of namespaced classes for maximum com- patibility. SEE ALSO
print_r(3), serialize(3), var_dump(3). PHP Documentation Group VAR_EXPORT(3)
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