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 state- ment.) 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.