I can`t solve this equation

 rtoc(x,y,z):= < sqrt(x^(2)+y^(2)) | if 0<x then (arctan(y/(x)))else (Pi+arctan((y)/(x)) )end if  ; | z     >

I am a new user migrating my calculus labs from Derive to Maple.

One exercise asks the student to "write a program" to convert coordinates of a point between 3-D coordinate systems. 

I have tried the function definition given above and the error message is "unable...

Assuming I have a general function f(x). The derivative with respect to x would be: df/dx .

I now want to rescale, which basically means that I want to change x to a*y where a is a parameter (general constant) and y is my new variable.

If I use

subs( x=a*y, df(x)/dx )

I get

d/d(a*y)  f(a*y)

but 'a' should be a parameter, so this should give

1/a * df(a*y)/dy = df(y)/dy

How do I tell that to Maple?

I know that I have raised this question before, and also got some responses.

However, I cannot find the thread, and I'm still interested in what is going on.

I don't have a clue.

restart;
f:=proc(a)
plot(sin(x),x=0..Pi);
#plot(x^3,x=0..1);
#plot(undefined,x=0..1);
a^2   
end proc:

#Now try plotting what should be the parabola y = x^2 on the interval -1..1:
plot(f,-1..1,adaptive=false);
plot(f,-1..1);
plot(f(a),a=-1..1);

Another pointplot3d animate problem

when the axes option is not specified the view option magnifies the symbols when symbol=circle
The field of view is not increased as it should.

animate(pointplot3d, [[[1, 2, 3], [4, 5, 6], [2, 2, 2]], color = blue, symbol=circle, orientation = [A, A]], A = 45 .. 405, view = [-100 .. 100, -100 .. 100, -100 .. 100], frames = 100);

 This is in Maple 12, I haven't checked to see if it exists in newer versions of Maple. 

 i want to create matrix that it`s element are matrix.
for example my matrix is 3*3 and elements are 2*2
in addition my element-matrix elements are unknown(x11,x12,........)

Hello all,

I have a nonlinear model y=f(x,y,z,p) that I'd like to solve for various value of p (parameter), where f is a system of equations. This model is constrained by a set of inequalities c(x,y,z,p) <= 0.

I coded the model up in Maple in the following format:

f1 := ...;

f2:=....;

f3:=...;

f4:=...;

c1:= x>=0;

c2:= ....;

etc.

To solve this, I type:

I have a maple worksheet with 2d input:

> for i to 10 do f := proc (x) options operator, arrow; x^2 end proc; f(x) end do;

of course it looks "pretty" in the actual worksheet.

When I export this to Latex I get the standard stuff and this:

\begin{maplegroup}

\begin{mapleinput}

\mapleinline{active}{2d}{for i to 10 do f := proc (x) options operator, arrow; x^2 end proc; f(x) end do; -1}{\[\]}

I ' m trying to plot this parabolas and hyperbollas and all I am getting is like a triangle and a couple of crossed lines. (with or without scaling=constraint)

with(plots):

polarplot(4/(1+1.1*sin(x))):

polarplot(2/(1-sin(x)),x);

polarplot(2*1.5/(1-1.5*cos(x)),x);

Is it another problem with Maple?

Thanks.

I get a data of string type from .txt file,but i want to use the data from string type to float tpye in my program,In fact ,i had tried in many methods,convert,sscanf,type etc.but, i coundnt solve this problem until now.if u know,please tell me how can i do.

example:

x:="0.01"⇒x=0.01

Assuming I have an expression, 'F', I would like to extract from it a factor, 'a', so the expression is displayed as

a*(F/a)

where F/a is a simplified (or expanded or any other displayed form) expression.

As an example:

F:=1 + Q*x² + P*x³

a:=x² / L²

then this will be displayed

x² / L² * ( L² / x² + Q*L² + P*L²*x)

This doesn't seem to work in Maple 13 and 14.  However it works in Maple 12.
All I get is a static animation plot.

with(plots):
animate(pointplot3d,[[[1,2,3],[4,5,3],[2,2,2]],color=blue,orientation=[45,A]],A=45..315);

What am I doing wrong?

Hi

I started my university project 5 months ago and working with maple from that time.

I used maple help to solve my problem but for this one I could not.

I have equation system with 4 equations and variables are for example x y z w .

The problem is I  have  xy  x^2  x^3  yw   in my equations so maple with solve could not solve that.

On the other hand,the equation are parametric and non numeric...

Hi, can someone tell me how to approach converting an expression is z to one in powers of z^-1?

For example, express f(z) = z/(z-1) as 1/(1-z^-1) ?

Thanks

I have a inserted code-edit region in Maple-14.
The first line says restart: and then I have some data.

When I collapse the code edit region is says restart: beside the icon.
I dont understand why Maplesoft has not fixed such a "leak" ?

For me such small things are highly important because when you
use maple on a daily basis such small inconsistencies will give grow you a cancer.

Another thing, why cant I programmaticaly load a matrix with data into a code