open4: integrating sqrt(x) from 0 to 1
acc=0.0001 eps=0.0001
              Q = 0.666709
          exact = 0.666667
          calls = 28
estimated error = 0.000166671
   actual error = 4.20973e-05

clenshaw_curtis: integrating sqrt(x) from 0 to 1
acc=0.0001 eps=0.0001
              Q = 0.666666
          exact = 0.666667
          calls = 56
estimated error = 0.000166667
   actual error = 5.9542e-07

open4: integrating 1/sqrt(x) from 0 to 1
acc=0.0001 eps=0.0001
              Q = 1.99999
          exact = 2
          calls = 12860
estimated error = 0.000299999
   actual error = 8.98634e-06

clenshaw_curtis: integrating 1/sqrt(x) from 0 to 1
acc=0.0001 eps=0.0001
              Q = 2
          exact = 2
          calls = 32
estimated error = 0.0003
   actual error = 4.97568e-07

open4: integrating log(x)/sqrt(x) from 0 to 1
acc=0.001 eps=0.001
              Q = -3.99979
          exact = -4
          calls = 8572
estimated error = 0.00499979
   actual error = 0.000209915

clenshaw_curtis: integrating log(x)/sqrt(x) from 0 to 1
acc=0.001 eps=0.001
              Q = -3.99972
          exact = -4
          calls = 72
estimated error = 0.00499972
   actual error = 0.000280646