[Bug] Calculus calculation in xcas

05172019, 05:01 AM
(This post was last modified: 05172019 05:04 AM by yangyongkang.)
Post: #1




[Bug] Calculus calculation in xcas
(i) calculating indefinite integrals
(1) Xcas can calculate this Code: int(x^n,x) Code: int(1/x^n,x) (2) Multiple integral questions in this article (ii) In terms of derivative (1) Code: tcollect(laplacian(f(r*cos(theta)*cos(beta),r*cos(theta)*sin(beta),r*sin(theta)),[r,beta,theta])) (2) Code: zeros(diff(f(x,y,z(x,y)),[x,y]),diff(z(x,y),[x,y])) thank you parisse! study hard, improve every day 

05282019, 02:07 PM
(This post was last modified: 05282019 02:09 PM by yangyongkang.)
Post: #2




RE: [Bug] Calculus calculation in xcas
study hard, improve every day 

05282019, 02:51 PM
Post: #3




RE: [Bug] Calculus calculation in xcas
(05282019 02:07 PM)yangyongkang Wrote: Seems to work on okay on my Prime virtual and hardware calculators as well as xcas on the computer. It's pretty messy till you use simplify, but it works. 

05282019, 10:24 PM
Post: #4




RE: [Bug] Calculus calculation in xcas
(05282019 02:07 PM)yangyongkang Wrote: For what it's worth, the TI Nspire can't solve it either! — Ian Abbott 

05292019, 02:51 AM
Post: #5




RE: [Bug] Calculus calculation in xcas
Select more complex indefinite points and test xcas or hp prime
Code: normal(([int(1/(x^3+x+1), x), study hard, improve every day 

05292019, 04:27 AM
(This post was last modified: 05292019 04:27 AM by Wes Loewer.)
Post: #6




RE: [Bug] Calculus calculation in xcas
(05292019 02:51 AM)yangyongkang Wrote: Select more complex indefinite points and test xcas or hp prime Actually, the Prime is able to find antiderivatives for some of these, but others not. Of the ones for which it could not, I tried a few on WolframAlpha and it also failed to find the antiderivatives. I didn't bother checking them all. Are there any of these that you listed that another CAS solves but Prime does not? Some functions simply don't have antiderivatives that can be expressed in closed form. You can't blame the Prime/xcas for not finding something that's not there. 

05292019, 05:08 AM
Post: #7




RE: [Bug] Calculus calculation in xcas
[suggestion] supports region integration and Boolean functions
For example, to calculate the area of a circle, we can do this Code: int(int(when(x^2+y^2<=r^2,1,0),x,r,r),y,r,r) study hard, improve every day 

05292019, 05:10 AM
Post: #8




RE: [Bug] Calculus calculation in xcas
(05292019 04:27 AM)Wes Loewer Wrote:(05292019 02:51 AM)yangyongkang Wrote: Select more complex indefinite points and test xcas or hp prime This is just testing, not comparing, because these examples are complicated study hard, improve every day 

06142019, 08:34 AM
Post: #9




RE: [Bug] Calculus calculation in xcas
The problem is not solved, there is a new fixed point problem
study hard, improve every day 

10252019, 09:25 AM
Post: #10




RE: [Bug] Calculus calculation in xcas
hello, every one.I am back again. The unhappy thing is that these bugs are still not solved, new firmware is coming out, I hope the new CAS version can solve these problems.
study hard, improve every day 

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