restart;In this code "add" is a trouble.
A := Matrix([[1, 2, 1, 3], [1, 1, 2, 1], [1, -2, 5, -11]]);
cs := LinearAlgebra:-ColumnSpace(A);
cnames := [seq(c || j, j = 1 .. numelems(cs))];
cvals := seq(solve([entries(A[() .. (), k] -~ add(`*`~(cnames, cs)), 'nolist')], cnames)[], k = 1 .. op([1, 2], A));
seq(add*rhs~(cvals[k]) *~ cs, k = 1 .. op([1, 2], A));
add does not play its role. Why. Thank you.

Is there an easy command to generate the edge sets of of all connected graphs for a given number of vertices? Ideally, I'd like to output to be of the form (e.g.)

G={{1,2},{2,3},{1,3},{1,4}};

text text text text;

text1 text1;

so that I can easily copy it into another program to be read. Or, is there a way that I can produce an output like the following (e.g. for n=3)

G={{1,2},{2,3}};

text text text text;

text1 text1;

G={{1,2},{2,3},{1,3}};

text text text text;

text1 text1;

and have it export to a text file?

The timelimit command of Maple can be used to do a computation if it uses less than a given amount of time, otherwise generating an error message that can be cought by try ... catch. Now my question is that there exists any similar command, but with a limitation on memory usage, not the time usage. I don't mean what datalimit in kernelopts can does, because I am not going to limit the memory usage of the whole Maple session, but just a command which may be used inside a larger procedure etc.

Hello.

I wrote some codes for solving equations in a special way. My codes work very fine when my differential system has only one equation.

But when I extend it to a system that has two or more equations, sometimes does not work and I face with error. However, in one system (2 eq) it also works. But it is only a special case. If you want, I can upload it here as well.

I am attaching the maple file containing the error. You can observe it. 

By examining many cases, I think that maybe the root of the problem is that I must change my codes in a way that they are for a "system". Indeed, instead of writing codes for each differential equation, I must define a system and write these codes for a system containing some differential equations.
However, I think that the boundary conditions sometimes also may be the root of the error.

I change the attached codes for this purpose, but I failed. I prefer to not present my wrong codes for this purpose. 

If it is possible, help me to change my codes.

Thanks a lot.

ERROR.mw

Solve equation :x⁴-x³-3x²-x+12=0

I am running Maple 2021 and have this plot in Differential Equation. However, It will not display the Graph.

The  general solution : y = 1.42
                  "exp(-0.125*t)*sin(1.41*t)"

NULL;
soln := y(t) = 1.42*exp(-0.125*t)*sin(1.41*t);
         soln := y(t) = 1.42 exp(-0.125 t) sin(1.41 t)

(b) Plot y vs. t  and y' vs. t on the same axes.
Let y and dy be the right side and derivative , respectively, of soln. Graph y and dy together

So i have defined some variables example:

xb=1000
yb=2500

db=5321
eb=521
and i want to solve the following symbolically without maple taking into account the variables:
eb=ab*yb*db*x

How do I force Maple to show the equation for the expression symbolically without unassigning the variables? I was thinking about local variables, but that would make the worksheet messy as the variables are used in other calculations.

Thank you.

Hi all,

how to use semilogplot here

plots[odeplot](res1, [[t, N(t)]], 0.1e-2 .. 1000, axes = boxed, tickmarks = [3, 2], color = red, thickness = 1, linestyle = solid, titlefont = [Helvetica, roman, 18], labeldirections = [horizontal, vertical], labelfont = [Helvetica, roman, 24])

Universidad Metropolitana de Ciencias de la Educación
Santiago de Chile

Derivative operator on vectors of real variable (R3): applied to curvilinear motion with Maple and MapleSim

In the present work it will be demonstrated how the derivative operator acts in functions of real variable in the movement of a particle that performs a curvilinear trajectory; using the scientific software of the Maplesoft company known by the names Maple and MapleSim, because nowadays most university teachers (higher education) do not visualize the movement of the particle in real time as well as the results of the calculations of speed and acceleration simultaneously. The objectives achieved are to use the vector operator with the help of these programs. As a theoretical tool we will use the three-dimensional vector spaces of real variable with Newton's notation. The methodology we have used was native syntax and embedded components using block diagrams. For the case of particle motion we use the graphical programming proposed by MapleSim. Viable results were achieved for motivational effects and time reduction in complex calculations without neglecting innovation in physical sciences, for teachers in higher education and university students. This work is self-sustaining via Maple Cloud.

Lenin Araujo Castillo

Ambassador of Maple

I try to find kernel and image of a application whose i know the matrix.
restart;
with(LinearAlgebra);
A := Matrix([[1, 1, 1, -1], [-1, 1, -1, -1], [1, -1, -1, -1], [-1, -1, 1, 3]]);
k := op(NullSpace(A));#kernel
MatrixVectorMultiply(A, k);#check
C := op(ColumnSpace(A));
X := <x, y, z, t>;
F := MatrixVectorMultiply(A, X) - a*C[1] - b*C[2] - c*C[2];
G := op(convert(F, list));
solve({seq(G[i] = 0, i = 1 .. 4)}, {a, b, c}); why there is no solution ? Thank you.

How to fprintf say a plot into a docx file in maplesoft

kind help

I'm solving a set of non-linear equations:

eqn1 := W__1 + W__2 + W__3 + W__4 = 4;
             eqn1 := W__1 + W__2 + W__3 + W__4 = 4

eqn2 := W__1*zeta__1 + W__2*zeta__2 + W__3*zeta__3 + W__4*zeta__4 = 0;
eqn2 := W__1 zeta__1 + W__2 zeta__2 + W__3 zeta__3 + W__4 zeta__4 = 

  0


eqn3 := W__1*zeta__1^2 + W__2*zeta__2^2 + W__3*zeta__3^2 + W__4*zeta__4^2 = 2/3;
                         2               2               2
     eqn3 := W__1 zeta__1  + W__2 zeta__2  + W__3 zeta__3 

                      2   2
        + W__4 zeta__4  = -
                          3


eqn4 := W__1*zeta__1^3 + W__2*zeta__2^3 + W__3*zeta__3^3 + W__4*zeta__4^3 = 0;
                         3               3               3
     eqn4 := W__1 zeta__1  + W__2 zeta__2  + W__3 zeta__3 

                      3    
        + W__4 zeta__4  = 0


eqn5 := W__1*zeta__1^4 + W__2*zeta__2^4 + W__3*zeta__3^4 + W__4*zeta__4^4 = 2/5;
                         4               4               4
     eqn5 := W__1 zeta__1  + W__2 zeta__2  + W__3 zeta__3 

                      4   2
        + W__4 zeta__4  = -
                          5


eqn6 := W__1*zeta__1^5 + W__2*zeta__2^5 + W__3*zeta__3^5 + W__4*zeta__4^5 = 0;
                         5               5               5
     eqn6 := W__1 zeta__1  + W__2 zeta__2  + W__3 zeta__3 

                      5    
        + W__4 zeta__4  = 0


eqn7 := W__1*zeta__1^6 + W__2*zeta__2^6 + W__3*zeta__3^6 + W__4*zeta__4^6 = 2/7;
                         6               6               6
     eqn7 := W__1 zeta__1  + W__2 zeta__2  + W__3 zeta__3 

                      6   2
        + W__4 zeta__4  = -
                          7


eqn8 := W__1*zeta__1^7 + W__2*zeta__2^7 + W__3*zeta__3^7 + W__4*zeta__4^7 = 0;
                         7               7               7
     eqn8 := W__1 zeta__1  + W__2 zeta__2  + W__3 zeta__3 

                      7    
        + W__4 zeta__4  = 0


solve({eqn1, eqn2, eqn3, eqn4, eqn5, eqn6, eqn7}, {W__1, W__2, W__3, W__4, zeta__1, zeta__2, zeta__3, zeta__4});

However, the result looks like this:

How should I obtain numerical values for W1,W2,W3,W4,zeta1,zeta2,zeta3,zeta4 ?

I have an array with a list of parameters. Suppose there are three parameters, t1, t2 and t3. I like to evaulate the array for different values of the parameters. I can do it manually by a command such as

eval(array, {t1=1, t2=5, t3=10})

What is a more systematic approach and how can it be done? Suppose I do not know the number of paramters in advance and the number of parameters could possible be large. Once I know the number of parameters, I would like to map a list of values to the parameters.

Thanks in advance!

Is there any equivalent to Excel function arctan2?

This function takes x and y values, and returns values from -Pi to +Pi. In that way one can easily get the x and y values of an angle with correct signs.

Guys, this is still the most painful thing i Maple for me, and I hope this gets a high priority for future development.

It is still not possible to compare variables, when one of them could become zero.

Download CompareUnits.mw