Create a script called piecepyramid.m that computes a function Y(X) which is zero for X<-1, X+1 for -1<=X<0, -X+1 for 0<=X<1 and zero for X=>1. The script assumes that variable X is defined and assigns the value of the function to variable Y. To test it assign values to X in the various intervals and see if Y has the correct value after executing the script. For inspiration have a look in the example we did in class.