## invalid left hand side in assignment...

Dear all

I run my code, I think evrything is well coded, but I get the following error

invalid left hand side in assignment

Please, I need a help to solve this problem,  I haven't any idea about the origin of this error

IOMMcode.mw

Thank you

## Find roots of function ...

Dear all

I approximate the root of a given polynomial using Newton method.

Whem I change the output option the number of iteration change as displayed,

Why changind only output from animation to plot, the number of iterations displayed with each figure is not the same.

NewtonQuestion.mw

thank you

## table three columns ...

Dear all

I would like to create a table that contains my ouput : iteration, eigenvalues, eigenvectors,
My code work well, but unfortunatelly I can't display a table with the wanted output.

cccc.mw

Thank you

## How to draw 3D plot from given data...

Dear All,

How to draw 3D plot from given data as follows

x:=[0.1, 0.2, 0.3, 0.4, 0.5, 0.1, 0.2, 0.3, 0.4, 0.5,0.1, 0.2, 0.3, 0.4, 0.5,0.1, 0.2, 0.3, 0.4, 0.5,0.1, 0.2, 0.3, 0.4, 0.5]
y:=[0.1, 0.1, 0.1, 0.1, 0.1, 0.2, 0.2, 0.2, 0.2, 0.2, 0.3, 0.3, 0.3, 0.3, 0.3, 0.4, 0.4, 0.4, 0.4, 0.4,0.5,0.5,0.5,0.5,0.5]
z:=[1.971284960, 1.642401616, 1.372353338,1.153620572,0.9762759982,
1.675502483, 1.411976881, 1.190627373,1.007730234,0.8570007139,
1.397140245, 1.184230644, 1.003688984,0.852696223,0.7268039317,
1.144791107, 0.9725020383,0.8257592921,0.7020549659,0.5979974836,                                                                                 0.9208492326, 0.7816302394, 0.6627749172,0.5620029444,0.4766238930]

Like:

Product Name: Maple 17

## problem of index ...

Deal all

I would like to approximate the largest eigenvalue of a given maxtrix and its corresponding eigenvector.
I have a problem in step 7, how obtain the index where the maximum is located, then How I return at the end of while loop
a table contains eigenvalues, eigenvectors and err

PWM.mw

Thank you

## compute solution system of pdes...

Dear all

I have a coupled system of PDEs,
I would like to return the exact solution of the system using error integral function or complementary error function is possible

compute_integral_using_erfc_fct.mw

## Diophantine equations

by: Maple 17

It seems to me that Draghilev's method can be applied quite successfully to the solution of Diophantine equations. Here is a simple example where we find two solutions at the intersection line of two ellipsoids:
x1^2-x1*x2+x2^2+x2*x3+x3^2-961=0;
(x1-3)^2+10*x2^2+x3^2-900=0;

Solutions: (11, -4, -26) and (10, 1, 29).

Based on the text of the program, it is possible to solve various examples with Diophantine equations.
3d_1.mw

Explanations.
f3 is an auxiliary equation for finding the starting point, NPar is a procedure that implements the Draghilev method, the red color of the text is the place where the integer values of the points on the integral curve are filtered.

Can be compared with the solution of the
isolve function

restart:
f1 := x1^2-x1*x2+x2^2+x2*x3+x3^2-961;
f2 := (x1-3)^2+10*x2^2+x3^2-900;
isolve({f1, f2})

## number of arithmetic operations ...

Dear all

I construct by hand the two matrices L and U so that A= LU ( LU-factorization)
I would like to find the number of arithmetic operations required to obtain the matrices 𝐿 and 𝑈

Number_arithmetic_operation.mw

Thank you

## Vector in proc with no fixed size ...

Dear all
I have Sol=proc(  )
local .... ;
RES:=vector with size fixed
for k from 1 to 100  # iteration
a:=..
if a < 0.1 then
break;
end if ;
RES[k]:=a;
end do;
print(RES);
end proc;

My questions:
1) How can I define the vector RES with no size fixed ( we can not at the begin fix the size of RES)
2) Then how can I plot this vector versus number of iteration
Thank you

## Error, invalid left hand side in assignment...

Dear all

My code give me the following error
Error, (in SOR) invalid left hand side in assignment
I don't understand its origin.

coore_invalid.mw

Thank you

## Error, (in rtable/Sum) invalid arguments...

Dear all

I have the following code, that solves a linear system
But I get the error

Error, (in rtable/Sum) invalid arguments

code.mw

Thank you for any help

## Streamline, isotherms and 3D plots of nusselt numb...

Dear colleagues,

how can i plot streamlines and isothermes and also 3D graphes of Nussult number and skin friction coefficient for boundary layer flow problem with Maple?

Regards

MAXR

Modified.mw

3D plots of nusselt number like:

Streamline like:

## system of equations...

Dear all

How can I solve the system of equations with unknowns  c[2] and Z

system_eqs.mw

Maybe the question can be solved by hand.

thanks

## plot three dimensional curve using data points...

Dear all

I need your help to plot

1)   First:  a three dimensionl curve, that is plot F(X,Y), where X, Y, and F(X,y) is given

curve_three_d.mw

2) Second: can plot all the curves in the same graph ( 2-dimensional curve)  obtained from the following idea
for j from 0 by 5 to 40
plot( F(X,j), X)
end for