E01AEF Example Program Data
    4      2.0    6.0            : m, xmin, xmax
    0      1      0      2       : ip(1:m), n=1+2+1+3=7
    2.0    4.0    5.0    6.0     : x(1:m)
    1.0
    2.0   -1.0
    1.0
    2.0    4.0   -2.0            : y(1:n)