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mehdi jafari

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11 years, 237 days
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These are questions asked by mehdi jafari

a problem with slideshow F11...

mehdi jafari 769 Maple 2018
worksheet slideshow
August 18 2018
1 3

when using slideshow tool (F11), it just show the first page and arrows for going to other pages does not work. is it a bug?

steps of limit solution...

mehdi jafari 769 Maple
step-by-step tutor limit
July 31 2018
2 2

hi. i want to show steps of a limit solution, but maple says it is unbale to show. could anybody help?


int.mw

plot3d outside of an sphere?...

mehdi jafari 769 Maple
sphere 3d plotting
July 13 2018
3 1

how can i plot outside of an sphere? for example x^2+y^2+z^2>1 ? tnx for help

remove "fsolve" residual !...

mehdi jafari 769 Maple
rootfinding fsolve numeric
April 23 2018
2 0

i have a function,when using fsolve to solve it, it has two roots. when i substitute it into the main function, it has some residual and it is not exactly 0. how should i remove the residual ? i do not want to use "solve" command and i should use "fsolve" command. tnx in advance


 

> 

restart:
> 

f:=3*(2*x-1)^2*(1/2)-1/2;

(3/2)*(2*x-1)^2-1/2

 (1)
> 

ans:=fsolve(f)

.2113248654, .7886751346

 (2)
> 

eval(f,x=ans[2])

-0.4e-9

 (3)
> 

 

> 

 

> 

 

``


 

Download problem.mw

a question on using "subs" command...

mehdi jafari 769 Maple
simplify subs algsubs
April 01 2018
2 3

hi, i have an expression "f" and i want to substitute the expression with Square root with another namee like phi, how should i do that? i should not use solve commands since the expression is more complicated and i have just pick part of it. tnx in advance.

 

> 

restart
> 

f:=(3*beta[11]^2-4*beta[11]*sigma[11]+6*beta[12]^2-12*beta[12]*sigma[12]+2*sigma[11]^2+6*sigma[12]^2)*(1/sqrt(6*beta[11]^2-8*beta[11]*sigma[11]+12*beta[12]^2-24*beta[12]*sigma[12]+4*sigma[11]^2+12*sigma[12]^2))*(1/omega^2);

(3*beta[11]^2-4*beta[11]*sigma[11]+6*beta[12]^2-12*beta[12]*sigma[12]+2*sigma[11]^2+6*sigma[12]^2)/((6*beta[11]^2-8*beta[11]*sigma[11]+12*beta[12]^2-24*beta[12]*sigma[12]+4*sigma[11]^2+12*sigma[12]^2)^(1/2)*omega^2)

 (1)
> 

subs(sqrt(6*beta[11]^2-8*beta[11]*sigma[11]+12*beta[12]^2-24*beta[12]*sigma[12]+4*sigma[11]^2+12*sigma[12]^2)=phi,f);

(3*beta[11]^2-4*beta[11]*sigma[11]+6*beta[12]^2-12*beta[12]*sigma[12]+2*sigma[11]^2+6*sigma[12]^2)/((6*beta[11]^2-8*beta[11]*sigma[11]+12*beta[12]^2-24*beta[12]*sigma[12]+4*sigma[11]^2+12*sigma[12]^2)^(1/2)*omega^2)

 (2)
> 

factor(simplify(f,{sqrt(6*beta[11]^2-8*beta[11]*sigma[11]+12*beta[12]^2-24*beta[12]*sigma[12]+4*sigma[11]^2+12*sigma[12]^2) = phi}));

Error, (in simplify/siderels:-simplify/siderels) side relations must be polynomials in (name or function) variables

  
> 

simplify(algsubs(sqrt(6*beta[11]^2-8*beta[11]*sigma[11]+12*beta[12]^2-24*beta[12]*sigma[12]+4*sigma[11]^2+12*sigma[12]^2)=phi,  f))

Error, (in algsubs) no variables appearing rationally in pattern

  
> 

# i want sth like this :

(3*beta[11]^2-4*beta[11]*sigma[11]+6*beta[12]^2-12*beta[12]*sigma[12]+2*sigma[11]^2+6*sigma[12]^2)/(phi*omega^2)

 (3)

``


 

Download problem.mw

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