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Help evaluating integral - kevin3g - 03-31-2019 02:16 PM
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?
RE: Help evaluating integral - toshk - 03-31-2019 06:40 PM
[attachment=7083]
RE: Help evaluating integral - parisse - 03-31-2019 06:48 PM
preval
RE: Help evaluating integral - Wes Loewer - 04-01-2019 05:14 PM
(03-31-2019 06:48 PM)parisse Wrote: preval
The 50g had a PREVAL and I figured it meant PR EVALuate, but I always wondered what the "PR" stood for. Is it a French abbreviation?
RE: Help evaluating integral - parisse - 04-01-2019 05:26 PM
pr stands for primitive, the French word for antiderivative.
RE: Help evaluating integral - Wes Loewer - 04-01-2019 06:10 PM
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?
RE: Help evaluating integral - dae - 08-23-2019 06:00 PM
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 re-entered.
RE: Help evaluating integral - Aries - 08-24-2019 04:18 PM
(03-31-2019 02:16 PM)kevin3g Wrote: 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?
Ehm … you're talking about the first FTC ?
Best,
Aries
