I am trying to create the image shown below in Maple.

I am able to created the nodes and edges fairly easily. I would like to know how to add the labels to each edge, formatted as shown, and more importantly, have the edges decorated with the arrows, also as shown. I've tried playing around with digraphs, but I'm not really getting the desired look. I've attached my attempt and welcome any suggestions as to how to improve what I've done so far, as well as achieve my goal.

network.mw

Hello,

I'm trying to write units in Maple but it seems to not be working for certain things.  For example, I would like to express the quantity of 0.78 kg CO2/ kg.  While kg is recognized, CO2 is not.  Is there some sort of workaround? Other examples include things such as "mol He". 

Thanks

I am trying to plot the equation diff(P(t),t) = P(t)*(7-P(t))-10 on a direction field but I keep getting this error code: Error, (in DEtools/DEplot/CheckDE) extra unknowns found: YP[2].

This is what i have entered in:    

DEplot(diff(P(t),t) = P(t)*(7-P(t))-10,P(t),t=-10..10,P=-10..10,scene=[P,P(t)],conditions,number=1, stepsize=.01);
 

How I can plot the gradient of function V and then plot the result as well?

Anyone can help with the concept of these plots regard the physical aspect?

Thanks

fluid_flow_past_a_cylinder.mw

Hello, I found this very strange behavior in Maple and I can't explain why this is not working

A little bit of context first:

1. I placed a polygon as a boundary for a section and then two polygons that correspond to inner holes to the first one.
2. Then I proceed to create a regular mesh that places N x M points spread across the region (OK here)
3. A procedure checks weather or not a Point is inside the region, on the borders or in the inner holes (OK here)
4. Then I want to select the closest (but exterior) ones so I can create a path using the mesh points.
 

Here is where I find the issue. I start at a vertex called V[1,1] and I want to arrive at V[1,2] (in the document they are blue solid points marked they are near-vertices near the original polygons). The procedure that I apply finds a path towards the V[1,2] as I was expecting but when the procedure hits the V[1,2] coordinates the while loop does not stop

The condition I wrote was:    while point<>V[1,2] do  where 'point' is correctly generated by another procedure.

This happens in a 40 by 50 mesh but with other configurations it works properly (there are also another kind of errors but it's inherent to lack of optimization in my procedures).

What baffles me is why doesn't it stop the cycle, if I test the condition outside the loop it DOES recognize the points are indeed equal. Is it something in Maple or is it something in my PC?

Thanks to anyone who can see the error or the problem because I don't understand the nature of the problem.

Not_Working.mw

Hello, I am new to Maple. Can somebody tell me what is the reason of maple being unable to integrate my equation in dsolve on dsolve2? when I try to use dsolve for solve my equation in answer of maple there are expressions of integral that is not calculated, and how to handle it?

Thank you

At my first steps in vectorcalculus i calculating a scalar line integral, but the concept how to do this is not  yet clear to me 

ecxample_4_-_blz407_toegepaste_wiskunde.mw

https://drive.google.com/file/d/1K5mnfCAB_zSzLGNNz1rkUyjvRhCgpFi4/view?usp=sharing

Any idea why symgen hangs when using formal algorithm on this first order ode? I was just comparing the Lie symmetries generated for this ode using different algorithms when I noticed this hang on formal.

The textbook gives this result btw

From help on symgen it says

The first algorithms, called formal, formulates a linear PDE system for the infinitesimals [xi, eta], then formally triangularize this system - using differential algebra techniques - finally tacking the resulting uncoupled system. When successful, this algorithm returns the complete set of point symmetries admitted by a given ODE of order 2 or higher. NOTE: this algorithm is advantageous mainly for 2nd and higher order ODEs. The algorithm works as well in the case of first order ODEs, but in this case the subproblems it will need to solve to find the symmetries are as difficult to solve as the first order ODE itself.
 

But on Maple 2020.1 server seems to hang, taking 100% CPU. I had to terminate mserver.exe manually since clicking on interreupt button from worksheet has no effect. This only happens with formal algoritm. All others work very fast. 

I know help says this is meant for second order ODE's, but it also says it works  well for first order.  It seems to be stuck in solve call somewhere. Is this to be expected sometimes when using formal algo in symgen for first order ode's?

Maple can solve the ODE very quickly otherwise.

The following ode also hangs in symgen

ode:=diff(y(x),x)=x*y(x)^2-2*y(x)/x-1/x^3;

Download symgen_issue_1.mw

There are 3 lists of data 

how to plot 3 lines with x axis represent time 1,2,3...

Problem with pdsolve/numeric

Contextualizing:

I created a routine for solving a thermo-mechanical problem. The size of the spatial domain is a function of time and the thermo-mechanical behavior of the structure.

The solution is obtained by discretizing the time domain in n intervals. The thermo-mechanical responses are obtained at each time t[i] =t[i-1]+dt.

The material exhibits elastic and elastoplastic mechanical behavior and thus the problem was divided into two consecutive phases (phase 1 and 2).

The heat problem is nonlinear because the thermal properties are variable (termal conductivity, specific heat, and density).

The problem:

In phase 2, the pdsolve/numeric command returns an error for the solution of the heat conduction equation (equation called pde1). I believe this error is related to the derivative of thermal conductivity k(x1) (piecewise function).

I tested many alternatives (I wrote the pde1 equation in two different ways), I checked the routine many times and I don't understand the reason for the error. With each attempt, the command returns a different error.

Thanks for your attention and help.

Problem.mw

Display all lattices on a set with 3 elements.

hi

could you help me to solve this problem

dose the following problem has solution?and how can i write it in maple?

this is a problem 6 equation and 4 unknown variable

sys := 1.20710678118654752440084436211*x-.207106781186547524400844362106*y = 1, -1.20710678118654752440084436210*x+1.20710678118654752440084436210*z+.207106781186547524400844362105*y-.207106781186547524400844362105*w+1.61353108866376978508023871599*z-1.61353108866376978508023871599*w = 0, 1.41421356237309504880168872421*x-1.41421356237309504880168872421*z-1.41421356237309504880168872421*y+1.41421356237309504880168872421*w-1.37455258362134694054214893147*z-1.37455258362134694054214893147*w = 0, -1.20710678118654752440084436210*x-1.20710678118654752440084436210*z+.207106781186547524400844362105*y+.207106781186547524400844362105*w+.238978505042422844538089784517*x-.238978505042422844538089784517*y = 0, 1.41421356237309504880168872421*x+1.41421356237309504880168872421*z-1.41421356237309504880168872421*y-1.41421356237309504880168872421*w+1.37455258362134694054214893147*x-1.37455258362134694054214893147*x = 0

I wish to write 2D output strings in various colors. Normally I use printf, though I'm willing to hear other suggestions.

An optimal procedure would one where I pass it the string, and a ColorName color such as "DodgerBlue" or "xkcd blue", but I'm happy if it means passing my own hex code.  Thanks.

Hi every one

I'm having some plots in maple, but the layout is not pretty enough, I want export in to MATLAB. Does some one please have an idea on how I can go about it?.

I'm using Maple 16

Thank you in anticipation

Hi everyone.

I have a 2D function and I wanna after Differentiating from it with respect to tau (at any amount of sigma value) and equaling this derivative to zero solve the infinite system of equations.

P[n](tau)==LegendreP(n - 1/2, cosh(tau)) , Q[n](tau)==LegendreQ(n - 1/2, cosh(tau)) 

are Legendre function.

Thanks in advanced

FUNCTION_f.mw

Download FUNCTION_f.mw