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Questions about Eigenmath for the fx9860gII by diameter

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Re: Questions about Eigenmath for the fx9860gII by diameter

Postby Cartix » Sat Apr 19, 2014 10:20 am

It obviously can't. Sorry :(
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Re: Questions about Eigenmath for the fx9860gII by diameter

Postby helder7 » Mon Apr 21, 2014 6:34 pm

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

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Re: Questions about Eigenmath for the fx9860gII by diameter

Postby Cartix » Mon Apr 21, 2014 6:53 pm

@Helder : Which language is that ?
Be careful that Hospital rules works only for undefined limit (i think)
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Re: Questions about Eigenmath for the fx9860gII by diameter

Postby helder7 » Mon Apr 21, 2014 7:10 pm

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

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Re: Questions about Eigenmath for the fx9860gII by diameter

Postby gbl08ma » Mon Apr 21, 2014 7:20 pm

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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