Annonymouse

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7 years, 10 days

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These are questions asked by Annonymouse

I wanted to make a 3d plot with lines linking points, but I am struggling with it
(I couldn't find anything in the plot3d documentation, so it might not be supported, which would be odd as its such a normal thing to want to do)

I have tried with no success:

plot3d([1, 2, 3], [4, 5, 6]);
plot3d(Matrix(2, 3, {(1, 1) = 1, (1, 2) = 2, (1, 3) = 3, (2, 1) = 4, (2, 2) = 5, (2, 3) = 6}))

Any thoughts?

I have a relatively complicated ODE that i am plotting. One of the variables in particular (B[2211], purple line in the graph) should under go an exponential-like decay to zero, but instead flies off into negative territory  (see graph below) despite having a very simple equation:

problem variable rate of change= -problem variable*constant +linear combination of variables that  are always posotive.

 

My intuition is that this is because i have somehow used the odeplot tool wrong - possibly due to a problem with stepsizes.

Here is a MWE i've made:

aa_problem_MWE.mw

 

Hi

I've attached a worksheet (Solve_Problems_MWE.mw), in which I'm working on finding any solution to a list of equations, in which the parameters and variables are not neccessarilly zero. I've used the solve command in the form S=[solve([Eq1,Eq2,...])], because I've been unable to find a list of parameters and variables for which solve([Eq1,Eq2...],[var1, var2,...  ]) returns anything.

I'd like to use a function to sort through the entries of S, by converting lists into arrays, and using the array tools package to check for 0s in the entries of the converted S[1], S[2],...

However, Maple doesn't want to convert S[1],S[2]... into arrays.

Does anyone know how to make it work? or how to circumnavigate the problem?
 


with(LinearAlgebra);
DotProduct([a, b], [c, d]);

 

gives

 

Does it think that I want my variables complex conjugated? (And why?) How do i turn it off?

It is a truth universally acknowledged, that a single man in possession of an algorithm for calculating a Groebner basis, must be in want of an algorthim for calculating a reduced Groebner basis.

It seems odd that i can't find something in the Groebner package - if there isn't something there, I assume that there is a well known piece of code for doing this!

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