tables in scripts

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# 1  
tables in scripts

Hi ,

I have two tables with same length t1 and t2, I want to cretae a new third table where i put the difference between the elements of t2 and t1,

t3[0]= t1[0] - t2[0]
t3[1]= t1[1] - t2[1]

I am new to scripts, any help please? thanks
# 2  
Any help please??
# 3  
It's not allowed to bump up questions, read the rules.
# 4  
use the below example

area[5]=`expr ${area[11]} + ${area[13]}`
# 5  
Sorry for repeating my question.

I tried this:
for element in ${#tab1[*]}

$tab_T1[$element]=`expr ${tab2[$element]} - ${tab1[$element]}`

do echo "$element"

echo ${#tab_T1[*]}

but it gives me error;
line 56: syntax error near unexpected token `$tab_T1[$element]=`expr ${tab2[$element]} - ${tab1[$element]} line 56: `$tab_T1[$element]=`expr ${tab2[$element]} - ${tab1[$element]}`'
# 6  
try this

for element in tab1
$tab_T1[element]=`expr ${tab2[element]} - ${tab1[element]}`

# 7  
I tried this

for element in `seq 1 50`

$tab_T1[element] = ` expr ${tab2[element]} - ${tab1[element]} `
echo "$element"

but had the same error

./T1: line 57: [1]: command not found
./T1: line 57: [2]: command not found
./T1: line 57: [3]: command not found
./T1: line 57: [4]: command not found
./T1: line 57: [5]: command not found
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