Maple 12 Questions and Posts

These are Posts and Questions associated with the product, Maple 12


How to create a polynomial for the curve fitting of the 3D plot in Maple?

I have following data

a := [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10];

b := [ 0.001, 0.001, 0.001, 0.001, 0.001, 0.001, 0.001, 0.001, 0.001, 0.001, 0.011, 0.011, 0.011, 0.011, 0.011, 0.011, 0.011, 0.011, 0.011, 0.011];

c := [ -0.88, -8.87, -0.86, -0.82, -0.77, -0.71, -0.66, -0.62, -0.57, -0.54, -0.89, -0.88, -0.85, -0.81,...



I have quite big problem with results processing from dsolv. 

reseni := dsolve(numeric, number = nclas, procedure = PopBal, start = 0, initial = inicon, procvars = dvars, range = 0 .. tend)

If I want a results from "reseni" in "tend" 


I got this one:

[t = 5., n[1](t) = 0.803965539772492772e-1, n[2](t) = 0.108666500575795332e-4,.........]

Now i dont know at all how I can work...

I would like to use Maple to expand the polynomial (1+x[1]+y[1])*(1-x[1])*(1-y[1])*(1+x[2]+y[2])*(1-x[2])*(1-y[2])*(1+x[3]+y[3])*(1-x[3])*(1-y[3])*(1+x[4]+y[4])*(1-x[4])*(1-y[4]). This is dreadfully complicated, but things are simplified by the fact that (in my situation) each x[i] and y[i] disappears when squared (x[i]^2 = y[i]^2 = 0 for all i). Is there a way to make Maple factor this into the computation?







Comment calculer avec Maple une intégrale première de omega:=(x^2-y*(x+y^2))*dx+x*(x+y^2)*dy.


Merci d'avance,



I am getting the floating point error during the job running. it happens instantly for the first fopen command and after some calculations it happens for the second fopen command also.

I would be appreciated if you could help  me in this regards,


here is the code:

> restart;
> w := 0.5695419e-1; T := evalf(2*Pi/w); Cl := 137;
> A := -(int(sin(w*t), t));
> P0 := -subs(t = t1, A)/Cl;
> mrdot0 := int(P0+A/Cl, t = t1 .. t2);

Further tags : implicit form, Matlab codegen for GPOPS purposes

Hi there,

I would like to introduce my self and ask you for an advice. 

I have a four linked robot that i would really like to control by the meaning of the optimal control theory. The arm has 4 actuators (giving torques U) in corrispondence of 4 rotational joints. P parameters describe the system.

I got ht edynamic system with the Lagrangian method and now I have 4 2nd order...

Can someone help me whith this plot? Somehow Maple always says unable to evaluate the function to numeric values in the region.

File is attached.

I am currently doing a project for mass transfer class. Here is a differential equation that I need to solve:

For the solution, and plug in the value of C_AS and C_A0, I finally got the concentration profile of:

Then I write the commands and Maple won't give me a plot (no warnings appeared). Can someone help me with this situation?

I'm using Maple to come up with equations, and then I'm substituting in variable names for functions which I can then output to Matlab.

I haven't had any problems until I ran into partial derivates described by the D[] operator.  For example, if i have a function f described by f(x(t),y(t)) and I differentiate it wrt t, I get 

D[1](f)(x(t),y(t))*(x(t)_dot) + D[2](f)(x(t),y(t))*(y(t)_dot)

I want to make a substitution for D[1](f)(x(t),y(t)) and D[2...

I want to solve the following equation


in terms of theta.

i.e theta=[f(phi)].

I'm running Maple 12 on my Windows 7 machine, 64-bit.  I never had this issue before when running in on XP (32-bit) for a couple years before I got a new machine.

Basically, whenever I go to Save or Save-As, Maple just closes.  It doesn't freeze or anything, just closes.  This problem is sporadic - sometimes it happens and sometimes it doesn't.  At first it was only doing it with Save and I overcame the problem by just making multiple versions of...

I have the following equation, I want to solve it for b keeping a and c fixed.


How to solve it in maple?




I am currently studing mass transfer (chemical engineering major), there is an equation that we need to plot to solve the problem. The equation is attached below.

When I use maple to plot this equation, it always come up "Warning, unable to evaluate the function to numeric values in the region; see the plotting command's help page to ensure the calling sequence is correct". Does anyone know how to plot this equation? Thank you very much for your help.

After viewing the table in print preview I realized that the table goes into the second page. I want to reduce the height of the table so that it fits in one page. How is that possible?

By moving the cursor to the edges of the table, I realized that it would allow to me to adjust the width of the table but not the height. The table has about 12 rows. 9 of them fit in one page, but 3 of them go into the next page. I want to shorten the height of the table so that the...

I sometimes like to work with worksheets in classic mode. However, I have just discovered that I cannot simply type "restart;" in the beginning of a worksheet in classic mode because it causes the worksheet window to freeze. However, if I click the "restart" button, then things go as normal. I really want to have each of my worksheets begin with the "restart;"  command. Need your assistant on a way out.

I use 64-bit windows 7 CORE i3 Dell Inspiron N4050.

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