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Exercise $1$

Suppose the following matrix represents the number of saws ordered from your company each month over the last year

saws $=[1,4,5,3,7,5,3,10,12,8,7,4]$

All the numbers should be zero or positive.

$($a$)$ Use an if statement to check whether any of the values in the matrix are invalid. $($Evaluate the whole matrix at once in a single if statement.$)$ Send the message "All valid" or else "Invalid number found" to the screen, depending on the results of your analysis.

$($b$)$ Change the saws matrix to include at least one negative number, and check your program to make sure that it works for both cases.