Help evaluating integral

03312019, 02:16 PM
Post: #1




Help evaluating integral
Say I already know the antiderivative, F(x), and want to find the area between 2 and 3. Is there a way to do F(2)F(3) without plugging in the function twice?


03312019, 06:40 PM
Post: #2




RE: Help evaluating integral  
03312019, 06:48 PM
Post: #3




RE: Help evaluating integral
preval


04012019, 05:14 PM
Post: #4




RE: Help evaluating integral  
04012019, 05:26 PM
Post: #5




RE: Help evaluating integral
pr stands for primitive, the French word for antiderivative.


04012019, 06:10 PM
Post: #6




RE: Help evaluating integral
I learned something new today. I see that the English language https://en.wikipedia.org/wiki/Antiderivative mentions "primitive function" as well. I don't recall ever hearing this term before. Anybody know of any English language countries that use this term?


08232019, 06:00 PM
Post: #7




RE: Help evaluating integral
Be sure to purge(x) before using preval(F(x),a,b).
If x has been assigned a value, F(x) will be evaluated using the current x value, before calculating F(b)  F(a). preval(x^2+x, 2, 3) outputs 6 only if x has not been assigned a value Similarly: f(x) := x^2+x preval(f(x), 2, 3) outputs 6 only if x has not been assigned a value If for instance, x has the value 1, preval(f(x),2,3) will output 0. Fortunately, if x is purged, then f(x) will revert to the symbolic expression without having to be reentered. 

08242019, 04:18 PM
Post: #8




RE: Help evaluating integral  
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