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Variable within a function does not accept its new value!

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0

I wrote the following function to sequentially add sum calculation into a variable.

RMS_Cal ()

{

    num=`cat synt_tdiffs.dat | wc -l`

    Sum=0

    cat synt_tdiffs.dat | while read info; do

        sta=`echo $info | cut -f 2 -d " "`

        tds=`echo $info | cut -f 3 -d " "`

        tdr=`grep -w "$sta" real_tdiffs.dat | cut -f 3 -d " "`

        sum=`echo "($tds - $tdr) ^ 2" | bc -l`

        Sum=`echo "$sum + $Sum" | bc -l`

    done

    echo $Sum

}

The problem is the "Sum" variable does not accept its new value after the while loop ends.

 RMS_Cal

++ cat synt_tdiffs.dat

++ wc -l

+ num=1

+ local Sum=0

+ cat synt_tdiffs.dat

+ read info

++ echo AHWZ ILBA 25.631

++ cut -f 2 -d ' '

+ sta=ILBA

++ echo AHWZ ILBA 25.631

++ cut -f 3 -d ' '

+ tds=25.631

++ grep -w ILBA real_tdiffs.dat

++ cut -f 3 -d ' '

+ tdr=527

++ echo '(25.631 - 527) ^ 2'

++ bc -l

+ sum=251370.874161

++ echo '251370.874161 + 0'

++ bc -l

+ Sum=251370.874161

+ read info

+ echo 0

0

How can I handle this problem?

variable

share

asked 5 mins ago

alireza niksejelalireza niksejel

833 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Possible duplicate of Why is my variable local in one 'while read' loop, but not in another seemingly similar loop?
  
  – muru
  3 mins ago
  

  
  
  
  

add a comment
 | 

0

I wrote the following function to sequentially add sum calculation into a variable.

RMS_Cal ()

{

    num=`cat synt_tdiffs.dat | wc -l`

    Sum=0

    cat synt_tdiffs.dat | while read info; do

        sta=`echo $info | cut -f 2 -d " "`

        tds=`echo $info | cut -f 3 -d " "`

        tdr=`grep -w "$sta" real_tdiffs.dat | cut -f 3 -d " "`

        sum=`echo "($tds - $tdr) ^ 2" | bc -l`

        Sum=`echo "$sum + $Sum" | bc -l`

    done

    echo $Sum

}

The problem is the "Sum" variable does not accept its new value after the while loop ends.

 RMS_Cal

++ cat synt_tdiffs.dat

++ wc -l

+ num=1

+ local Sum=0

+ cat synt_tdiffs.dat

+ read info

++ echo AHWZ ILBA 25.631

++ cut -f 2 -d ' '

+ sta=ILBA

++ echo AHWZ ILBA 25.631

++ cut -f 3 -d ' '

+ tds=25.631

++ grep -w ILBA real_tdiffs.dat

++ cut -f 3 -d ' '

+ tdr=527

++ echo '(25.631 - 527) ^ 2'

++ bc -l

+ sum=251370.874161

++ echo '251370.874161 + 0'

++ bc -l

+ Sum=251370.874161

+ read info

+ echo 0

0

How can I handle this problem?

variable

share

asked 5 mins ago

alireza niksejelalireza niksejel

833 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Possible duplicate of Why is my variable local in one 'while read' loop, but not in another seemingly similar loop?
  
  – muru
  3 mins ago
  

  
  
  
  

add a comment
 | 

I wrote the following function to sequentially add sum calculation into a variable.

RMS_Cal ()

{

    num=`cat synt_tdiffs.dat | wc -l`

    Sum=0

    cat synt_tdiffs.dat | while read info; do

        sta=`echo $info | cut -f 2 -d " "`

        tds=`echo $info | cut -f 3 -d " "`

        tdr=`grep -w "$sta" real_tdiffs.dat | cut -f 3 -d " "`

        sum=`echo "($tds - $tdr) ^ 2" | bc -l`

        Sum=`echo "$sum + $Sum" | bc -l`

    done

    echo $Sum

}

The problem is the "Sum" variable does not accept its new value after the while loop ends.

 RMS_Cal

++ cat synt_tdiffs.dat

++ wc -l

+ num=1

+ local Sum=0

+ cat synt_tdiffs.dat

+ read info

++ echo AHWZ ILBA 25.631

++ cut -f 2 -d ' '

+ sta=ILBA

++ echo AHWZ ILBA 25.631

++ cut -f 3 -d ' '

+ tds=25.631

++ grep -w ILBA real_tdiffs.dat

++ cut -f 3 -d ' '

+ tdr=527

++ echo '(25.631 - 527) ^ 2'

++ bc -l

+ sum=251370.874161

++ echo '251370.874161 + 0'

++ bc -l

+ Sum=251370.874161

+ read info

+ echo 0

0

How can I handle this problem?

variable

share

asked 5 mins ago

alireza niksejelalireza niksejel

833 bronze badges

RMS_Cal ()

{

    num=`cat synt_tdiffs.dat | wc -l`

    Sum=0

    cat synt_tdiffs.dat | while read info; do

        sta=`echo $info | cut -f 2 -d " "`

        tds=`echo $info | cut -f 3 -d " "`

        tdr=`grep -w "$sta" real_tdiffs.dat | cut -f 3 -d " "`

        sum=`echo "($tds - $tdr) ^ 2" | bc -l`

        Sum=`echo "$sum + $Sum" | bc -l`

    done

    echo $Sum

}

 RMS_Cal

++ cat synt_tdiffs.dat

++ wc -l

+ num=1

+ local Sum=0

+ cat synt_tdiffs.dat

+ read info

++ echo AHWZ ILBA 25.631

++ cut -f 2 -d ' '

+ sta=ILBA

++ echo AHWZ ILBA 25.631

++ cut -f 3 -d ' '

+ tds=25.631

++ grep -w ILBA real_tdiffs.dat

++ cut -f 3 -d ' '

+ tdr=527

++ echo '(25.631 - 527) ^ 2'

++ bc -l

+ sum=251370.874161

++ echo '251370.874161 + 0'

++ bc -l

+ Sum=251370.874161

+ read info

+ echo 0

0

share

asked 5 mins ago

alireza niksejelalireza niksejel

833 bronze badges

share

asked 5 mins ago

alireza niksejelalireza niksejel

833 bronze badges

asked 5 mins ago

alireza niksejelalireza niksejel

833 bronze badges

asked 5 mins ago

alireza niksejelalireza niksejel

833 bronze badges