Parse and evaluate expressions like these:
'1 + 2' '51 - 78' '42 * 9'
The only operators are +, -, *.
Both arguments will be integers between -50 and 50.
Return the 3n+1 sequence for n
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Put two time series onto the same time basis
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mathematics , probability problem
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Sum the entries of each column of a matrix which satisfy a logical condition.
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