182 Reputation

4 years, 122 days

RootOf not being removed with allvalues,...

Maple 2017

RootOfQuestion.mw

Hi Everyone, so i understand (to the best of my knowledge) the purpose of RootOf and I have worked with them before but now for some reason when i try to use allvalues to express the solution explicitly it does not express it, instead just keeps as RootOf expression.

I have attached the maple file I am working with.

I have also tried solve(expr, explicit) as well as convert(expr, radical) and still nothing.

Am I missing something small?

How to get maple to stop plotting once v...

Maple 2017

Hi Everyone, So i have a pretty ugly function which i am interesting in plotting. When i plot it seems that all values are real however when i do evalf with specific values of variable i am plotting over it shows that it is complex. Any thoughts on how to get it to stop plotting once it becomes complex? See attached maple file.

ComplexPlotQuestion.mw

Thanks.

Is it possible to calculate the Riemann ...

Maple

I am interested in trying to find the Kretschmann Scalar of certain metric, where the line element in given bellow as well as conditions on the indices.

I am wondering if there is any possible way to compute the Riemann tensor components just using indices with the physics package or the tensor package. I have used them both before but for metrics which are explicitly defined.

Thank you.

Textplot not working in display ...

textplot.mw

I am trying to do Textplot along with numerical ode solution plots in display command but it doesnt seem to want to work, i have included my code and it can be seen that textplot works for by itself but when i want to include it into display nothing happens, any thoughts?

Help would be appreciated.

Non-linear first order differential equa...

Maple

I am looking to solve the following ode numerically for different values of w,

diff(y(x),x)^2=y(x)^(-3w-1), along with the intial condition y(1)=1.

i have tried to solve this for w=-1/3 and w=0 but i am getting the error:

Error, (in DEtools/convertsys) unable to convert to an explicit first-order system

I believe it probably has something to do with the fact that the first derivative is squared but i dont know how to procede with fixing that.

Any help would be greatly appreciated.

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