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## Questions about Eigenmath for the fx9860gII by diameter

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Member
Posts: 31
Joined: Wed Apr 18, 2012 4:48 pm

### Re: Questions about Eigenmath for the fx9860gII by diameter

It obviously can't. Sorry

Senior Member
Posts: 369
Joined: Tue Jan 03, 2012 11:24 pm
Calculators: Casio Afx 1.0, Casio fx-9860 GII SD, Casio Classpad 330, Casio fx-CG 20, Casio Classpad fx-cp400

### Re: Questions about Eigenmath for the fx9860gII by diameter

I did a function some time ago to solve limits with l'hopital rule, but is a "bit" limited. Just support indeterminations of the type 0/0 and determined limits.

Code: Select all
`limh(a,b)=do(max=150,g=(numerator(a)),h=(denominator(a)),for(i,1,max,do(test(subst(b,x,h)==0,test(i==1,test(subst(b,x,g)==0,do(g=d(g),h=d(h)),do(print("Solution not found with L'Hopital's rule"),stop)),do(g=d(g),h=d(h))),do(print(subst(b,x,(g/h))),stop)))),print("Solution not found with L'Hopital's rule"))`

I do not use often the function. I usually draw the graph of the function and see the result from him. Works (almost) always. In my opinion is the best solution.
SiO2 + CaCO3 ----------> CaSiO3 + CO2

Member
Posts: 31
Joined: Wed Apr 18, 2012 4:48 pm

### Re: Questions about Eigenmath for the fx9860gII by diameter

@Helder : Which language is that ?
Be careful that Hospital rules works only for undefined limit (i think)

Senior Member
Posts: 369
Joined: Tue Jan 03, 2012 11:24 pm
Calculators: Casio Afx 1.0, Casio fx-9860 GII SD, Casio Classpad 330, Casio fx-CG 20, Casio Classpad fx-cp400

### Re: Questions about Eigenmath for the fx9860gII by diameter

It is a function/script for eigenmath.

The script check if the equation is a indetermination of the type 0/0 or no. If no it just solve the limit as a determined limit.
SiO2 + CaCO3 ----------> CaSiO3 + CO2

Senior Member
Posts: 141
Joined: Wed May 16, 2012 2:50 pm
Location: Portugal
Calculators: Casio fx-CG 20

### Re: Questions about Eigenmath for the fx9860gII by diameter

I know about that rule, but as you said it's quite limited, but when it can be used, it is very useful. Sadly this year we can no longer use it on exams here in Portugal (this told me my math teacher), and we must do variable substitution instead, oh well.

I usually just see the graph for the function. You can do e.g. 1.0001 and 0.9999 to simulate the 1+ and 1- sides. Be careful when interpreting the graph and the values, especially if it's a function with domain restrictions or a condition-defined function. "The calculator lies"...

EDIT: and unfortunately helder's script doesn't seem to work for most 0/0 indeterminations I have tried, at least not with my Prizm port: Eigenmath keeps throwing a "frame overflow" error.
EDIT2: I finally made it work, by restarting Eigenmath... I guess I didn't have enough RAM available.

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