Hi,

I tried to write a procedure which performs a differentiation on list elements:

list1:= [x^3 , 2x , 3]
list2:= [x^5, 2x^4 , 2x]

dList:=proc(a::list, b::list)::list;
    local res::list, i::integer, n::integer; 
    description "add list elements and diff";
    n:=min(nops(a), nops(b)) ;
res:=[seq(0, i=1..n)];
for i from 1 by 1 to n do
     res[i]:=diff(a[i]+b[i],x)
end do;
res;
end proc:


dList(list1,list2)

However the Line:  res[i]:=diff(a[i]+b[i],x)

causes the Error: Error, illegal use of an object as a name;

Can someone give me a hint how to fix this?

Thank you very much.

I hope you be health and happy :-)

Please send me a pdf of Maple 17, I have many problem about Maple 17, and can't ask whole of them here!!!

restart:

Xsubs:=X=x*exp(epsilon*alpha[1]);

Ysubs:=Y=y*exp(epsilon*alpha[2]);

psubs := P = p*exp(epsilon*alpha[3])

where P(X,Y) and p(x,y). epsilon, alpha[i], i=1,2,3 are parameters.

how to changeover from p(x,y) to P(X,Y) in the following equation?

Eq:= diff(p,y$2)+diff(p,x)=0;

Cheers!

Hello,

 I need help writing a maple code to calculate the normal to the curve X^2-2X at x=1.5

and also display the curve, the tangent, and the normal on the same plot in the range x=[-10,10].

I manage to answer the question, but i am not quite certain if i have written a proper code..please if someone can review my solution and advise me i would really appreciate it....

I also would like to also make visisble the point of tangency at x=1.5 and give description of the figure but i am not sure how to do so...

how can i cut and paste the exact code with the images....it seesm that it doesnt allow me to do direct cut and paste so i changed it to 1-D and paste it into this page..

Thank you for your help.. 

restart;

    f := proc (x) options operator, arrow; x^2-2*x end proc;

   (D(f))(x);

 #Then, the slope of the line tangent to the graph of f(x) at the point with x-coordinate, x=1.5 is,

    D(f)*at*x = 1.5; 

   evalf((D(f))(1.5));

#The y-coordinate of the point is 

  f(x)*at*x = 1.5;

   evalf(f(1.5));

   showtangent(f(x), x = 1.5, color = [black, purple]);

   plot([f(x), (D(f))(1.5)*(x-1.5)+f(1.5)], x = -10 .. 10, y = -10 .. 10, color = [black, purple]);

  plot([x^2-2*x, x-1.5-.75, -x+.75], x = -10 .. 10, y = -10 .. 10, color = [black, purple, pink]);

hi, is there a way to change color of the page in Maple 18? in fact I am preparing my lectures using slideshow option and want to change the color instead of the default white.

Hi guys,

       I have the following Lagrange function. 

       (Note :w is the generalized co-cordinate.) 

       L := (diff(w(r, t), t, r))*v(r, t)

       ( I know

        If L =diff(w(t),t)*v(t)..... I can write EulerLagrange(L,t,w(t) but I dont know how to handle above function)

        Thanks in advance!!!

There was a command for torusknot(x,y,z),r,R.  Is it included in Maple 17? The index and help to do not list it.

Is there a newer version of a torus knot?

i asked it to show explanations

and got an solution about that, but it doesnt work in my Maple

i wanna know what do i wrong , why it`s not working right

I am having issues opening my final year project, it was working an hour ago and now it will not open. When I try to open the file it brings up a box title TEXT FORMAT CHOICE with the options: MAPLE TEXT, PLAIN TEXT, MAPLE INPUT and CANCEL.

This is all my work and I need it to complete my year.

Any help with how I can rectify this would be extremely helpful.

Many thanks

Some maple worksheets are created in other languages (spanish, german, french, russian, etc...) , I attempted to use google translate but it is a paid service.  There are alternate free translators however I can't seem to get any of them working using the URL package. 

I'm trying to send data to http://translation.babylon.com/english/to-spanish/

Using similar code from my previous question with google translate we end up with a huge mess and no embedded translations in the code. 

s := "The quick brown fox jumps over the lazy dog":
result := URL:-Get(StringTools:-FormatMessage("http://translation.babylon.com/english/to-spanish/", s));

Any suggestions?

Hi

When I use below cmmand within conditional statements or proc loops, It dosent work

How can I use a similar command to export plot as an Image with arbitrary format under any circumstances?

plotsetup(bmp, plotoutput = `Pic.bmp`, plotoptions = `height=400,width=400`); NCP; (NCP has a plot structure)

Hi

I am trying to optimize a 39, 1 MATLAB matrix, but cannot seem to get a result beyond a 6, 1 matrix. I am getting "Warning, cannot resolve types, reassigning t##'s type" where t## varies from each time I run it, and can show multiple of these warnings. It also says "Warning, cannot translate list".

I found a pretty similar problem posted here earlier, where the user "Carl Love" suggested to replace a command from the original code with

Matlab(
     subsop([-1,1]= J, eval([codegen:-optimize](tmp, tryhard), pow= `^`)),
     output = string, defaulttype = numeric
);

I was wondering what exactly this command does? Can I apply it to my code to solve my problem? It yielded a result that looks (on the surface) as an optimized code, but I don't feel completely comfortable using it without being certain.

What I have done is simply to replace Matlab(tmp, optimize) with the suggested code above. My code is attached. Thanks in advance for any help.

OptiMatrix.mw

Hi,

I'm, trying to write a nested loop in maple, but I keep getting the Unterminated Loop error. I'm sure the solution is quite simple, but I haven't been able to find it. Any suggestions would be much appreciated. The loop looks like this:

i:=0:
di:=25:
n:=1:  

while (n<=nLimit) do
sol1:=fsolve(eq1, y=i..i+di)
     if type(sol1, numeric) = true then
     lambda(n) :=sol1
     i:=i+di
     n:=n+1
     else  i:=i+di
     end if:
end do:

Just wonder if there is a way to have maplesoft.com not think I'm in Germany. On my computer, iPad, and iPhone the website reverts to German language. My locale is west coast US. And I often search the website to learn more about using Maple. 

It's not a big issue, but if there is a way to have it remember English, I'd like to know.

Cheers, all !

hello everyone..

please...

I need help to write a code to calculate the riemann sum approximation of the curve cos(sqrt(x^2+y^2)+1 

calculate the actual volume using integration

use the ranges x=[-2pi to 2pi]=y, and 20 subdivisions.

also display the curve and the parallelepiped approximations on the same plot.

Thank you for your help!