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Sorry for my last comment. Everything is alright. My mistake. Data were not equally spaced.
Very good utilities. Thanks
in newtint.m file there is an error in Everett's method (line 163) and Stirling's method (line 136).
Error msg: newtint: A(I,J): row index out of bounds; value 5 out of bound 4
I tried to execute the following command:
y = [308.6 362.6 423.3 491.4];
x = [0.055389 0.047485 0.040914 0.035413];
c = 4; %c=3