Numerical Integration
bob
Hello,
I’m new on the forum, I’m student working on the field of chemistry, at the end of my Master theses. I use Igor for 3 years and I always found answer or first step for resolution on the forum but I’m actually lost for integral calculation.
I have to calculate the integral shows in the attached file were g(w) is an 1D function (phonon density of stats Vs w)
The only way I see is to program completely the integration with small rectangle, etc… Is there a tool with Igor to perform this sort of integral calculation?
Maybe someone can give me one of the these very useful “Display topics”.
Thanks in advance for your help,
Robert
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maybe
displayhelptopic "integrate1D"will help?
July 25, 2018 at 07:43 am - Permalink
Hello Robert,
Before you dive into executing Integrate1D please take a moment to evaluate a meaningful range of integration. If you simply plug in values you will likely run into problems. Consider, e.g., your lower integration limit: w=>0 =>exp()=>1 and ln(0) =>-inf. In such situations you need to have g(w) provide bracketing so that the actual limits of integration are [a,b] with a>0 and b finite.
A.G.
August 10, 2018 at 07:45 am - Permalink