Calculate the right Riemann sum of f(x)=x^2+2x-1 on the interval I=[0,2] with 4 regular portions.

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I am getting this error " Execution of script riemansum as a function is not supported".Can someone help?
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Walter Roberson
Walter Roberson on 21 Nov 2021
The first executable word of file riemansum.m is not "function", so MATLAB considers the file to be a script that can be executed but not called.
What is the first non-comment non-blank line of riemansum.m ?

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