Do operation as per given string
Example: '3*5' then answer must be 15;
'3+5' then answer must be 8;
'35' then answer must be 35;
Return 'on' or 'off'
Generate vector according to sign of vector
length of a vector
Change the first and last diagonal element of the identity matrix to zero
Cumulative product of a vector
Find out DC Gain of transfer function
Find out output of following expression
Count number of words in string
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