Is this a bug?

eq:=5*x+y-10=0:
eq2:=y=solve(eq,y):

f:=(x,y)->eq2
                              
f(3,1)
                   

I think the way I applied it above is a bit unorthodox to Maple but maybe it is a bug.  Normally I think we use unapply in this situation. 

f:=unapply(eq2,x,y)
                             
f(3,1)
                     

Okay better, but I think that first way should work no?

Hi guys,

I want to solve the matrix equation. suppose we have a matrix A 4*4 which only first array of it (1,1) is equal to n and another matrix such as S which is again 4*4 and generally, we don't know its arrays and we want A and S satisfy the following equation:

S*A*inverse(S)=A

how we can find out arrays of S?

A=Matrix([[1,0,0,0],[0,0,0,0],[0,0,0,0],[0,0,0,0]])

S=Matrix([[a,b,c,d],[e,f,g,h],[I,j,k,l],[m,n,o,p]])

thanks

I have a .mla file, filename.mla, in a folder and typed with(filename), but Maple says "Error, invalid input: with expects its 1st argument, pname, to be of type {`module`, package}, but received convex". So how to use a  .mla file in Maple exactly?

Thanks a lot.

Years ago i used maple as in a worksheet

Nowadys there are two ways to use Maple: in document mode and worksheet mode ?

Very confusing this and it seems that the old worksheet mode has nothing to do with the document mode
 

Now in Maple i don't now how to use the worksheet mode anymore.
Can this worksheet mode used togehter with the document mode?

This is real troublesome exercise  to use Maple, why should i use the document mode and offers it the same functionality as in the worksheet mode ?

I am trying to isolate theta/V in this equation, but Maple will only allow me to solve for either theta or V. Is there a way to make Maple solve for the expression instead of the variable?

I have attached the Maple document below. It contains some other stuff but it is mostly this equation I am interested in. It can be found near the bottom. I hope someone can help.

Best regards

Opdelt_TF_Maple.mw

Why does Maple product history page   stop at Maple 6, year 2000?

Maple starterd in 1984. There are more versions before version 6. I think this official Maple page should list every release made in Maple and do not understand why it stop at version 6 only.

Wikipedia has more complete and detailed history of Maple products, starting with version 1 in 1982, with minor versions also shown than Maple own official web page gives.

btw, Wilipedia says version 6 was released in December 6, 1999. But Maple official page says version 6 was released in 2000.  

Any help why this code fail

restart;
PDE := diff(u(x,y), y$2 ) + diff(u(x,y), x$2) = 0;
BC:= u(x,0)=0, u(x,100)=100, u(0,y)=0, u(10,y)=0;
sol:=pdsolve([PDE,BC],numeric);

gives

Error, (in pdsolve/numeric/process_PDEs) PDEs can only contain dependent variables with direct dependence on the independent variables of the problem, got {u(0, y), u(10, y), u(x, 0), u(x, 100)}
 

But sol:=pdsolve([PDE,BC])  works OK and gives analytical solution.

What error Am I doing in the above code in this case?

Maple 2020 with Physics 642

Is there any possibility to define which units are used in components, like MathContainers?

I would like to have kN/m, I get mm2*kg/m3*m/s2...

I'd like to find chromatic number of some graphs. But I find a strange thing of function ChromaticNumber. 

It is Ok!

But when I use following codes, an error will be issued.

I try to take a partial derivative of compound expressions. Usage of diff, Diff, substitution variables instead of time-variant variables (subs) couldn't help me.

Download DiffExpr.mw

Should I use implicitdiff? If yes, how does it work?

Also, I don't understand, why the derivative of theta_l is displayed so strange, as if the derivative is taken from the index l?

P.S. This question is a continuation of my last topic: https://www.mapleprimes.com/questions/229551-Operations-On-Several-Defined-Functions

Hello everyone! I was trying to draw a circle point by point using animate, but there's a catch: I'd like it to be created in front of the user, that is seeing every point being drawn in sequence.

Like this, but with the point leaving a trail behind him.

Can anyone help?

Hello,

I'm trying to evaluate if the matrizes are the same but i cant figure out why it say they are different.

restart;
with(DEtools);
DEplot(diff(y(t), t$2)-3*(diff(y(t), t))+2*y(t) = exp(t), [[y(0) = 0, (D(y))(0) = 2]], stepsize = .1, linecolor = black, thickness = 2);

Is there a way to enter a formula into the coloums to generate the output?
I did the Table of Values by Hand which will take a long time for real data.

Thanks in Advance

Download InverseNum.mw

Why are these functions not graphed correctly?
 

Download inverseExample.mw