MaplePrimes - Questions and Posts tagged with help

how to get rid of "unable to match delimiters" error message?

Aozlex — Fri, 18 May 2012 02:54:33 Z

here is the code that shows the error message

are there anyone can help me a little bit and check it why?

how to use dot (time derivative)

ramivei — Sat, 14 Apr 2012 20:37:19 Z

Hello,

I wish to enter in the math dot operator but I can't find the way to enter it in the document mod. I also searched the help and did not find a way.

all I want is to enter dot(varphi)

thanks

Rami

convert a matrix as an index

Majed — Tue, 10 Apr 2012 09:50:47 Z

Hello,

I have a big problem and I don't know how to resolve it.

I have two matrices: A and B. I want to use B[1] as an index of A ,i.e.,

B[1] := [1, 1]; Ok

A[B[1]]; But this does'nt work.

Thanks for your help...

Plotting state space representation of a nonlinear system

ronnied312 — Thu, 29 Mar 2012 16:26:22 Z

I'm am new to maple and am not very familiar with it.

I have a state space represnetaiton (Xdot = AX+Bu y+CX+Du)of a 3rd order non linear system.

X=[X1; X2; X3]

Xdot=[X1dot; X2dot; X3dot]

A=[0 -1 -1; 1 0.2 0; X3 0 -2.4]

B=[0; 0; 2]

C=[1 0 0]

D=0

With initial conditons:

X1(0)=X2(0)=x3(0)=An arbitrary concept of my choice.

I need to plot x1(t) Vs time.

I also need to plot the state trajectories...

Close form equation solving

saeidmo — Sat, 24 Mar 2012 07:21:51 Z

Dear All,

I have an equation to solve.

1= sum_{i=1}^n 1/(x+a_i) where a_i is given. I want to solve this equation for unknown x. I know there is a value between 0 and 1. Although I can find the solution by numerical method, I am interested in close form to solve this equation.

Help please.

Best Regards,

Saeid

I have the function which I run well in Maple V but in maple 15 .It's wrong

ytyyutianyun — Fri, 23 Mar 2012 09:00:14 Z

I have the function which I run well in Maple V
but in maple 15 .It's wrong. How can it be? and please help me to edit it.

for i from 0 to 15 do
t:=1+i/16;
p.i:=plot(sin(x*t),x=-10..10,axes=none):
od:
display(array(1..4,1..4,[[p0,p1,p2,p3],[p4,p5,p6,p7],
[p8,p9,p10,p11],[p12,p13,p14,p15]]));

How do I solve the following system of equations?

KateXX — Wed, 21 Mar 2012 12:01:03 Z

Hello,

Could you please help me with the following system of equations:

> restart; with(student);
> Z[0] = 377;
> solve({Z = 1/(j*w*C[1]+1/(j*w*L[1])+1/R)+1/(j*w*C[2]+1/(j*w*L[2])), C[1] = w[c]*(w[0]^2-w[c]^2)*(w[2]^2-w[1]^2)/(2*Z[0]*(w[1]^2-w[c]^2)*(w[0]^2-w[1]^2)), C[2] = w[c]*(w[0]^2-w[c]^2)*(w[2]^2-w[1]^2)/(2*Z[0]*(w[1]^2-w[c]^2)*(w[2]^2-w[c]^2)*(w[2]^2-w[0]^2)), L[1] = 1/(w[1]^2*C[1]), L[2] = 1/(w[2]^2*C[2]), R[1] = subs(w = w[1], 2*Z[0]*(1-S[21...

the button of chossing this functionality of (solve /Numerically Solve) the equation dissapear....

zizodev — Wed, 14 Mar 2012 12:19:41 Z

hi everybody!!

i have tried to (solve /Numerically Solve) the equation below

x-(sin(88.61) TAN(286.13)*(45567))/(sqrt(sin(49.12)^2+2 sin(49.12) TAN(14.93) cos(49.12)+2 sin(49.12) TAN(286.13) cos (88.61)

cos(49.12)+2 TAN(14.93)^2 cos(49.12) TAN(286.13) cos (88.61) sin(49.12)+2 TAN(286.13)^2 cos^2 (88.61)^2 cos(49.12) TAN(14.93)

sin(49.12)+TAN(286.13)^2 cos^2 (88.61)^2 TAN(14.93)^2 sin(49.12)^2+TAN(286.13)^2 sin(88.61)^2+TAN(286.13)^2 sin(88.61)^2

How find transferfunction

allmon84 — Sun, 11 Mar 2012 10:46:47 Z

Hi I'm new to maple and have to solve this:

Find the transferfunction

I beleve the answer should be:
H(s) = Y(s)/G(s) = 1/(s^2+(1/4)s+1) (correct me if I'm wrong)
but i have to show how to do it in Maple in a scool project

please help me have tried for several hours now, but cant get it right

PLOT(...) Trying to use Display

mwahlgreen — Fri, 09 Mar 2012 15:28:02 Z

Hello

I need some help on a problem which seems simple...

I'm doing as follows:

restart; with(LinearAlgebra); with(plots):

II[C] := proc (delta) options operator, arrow; 230/(84192.96489-230*cos(delta)+(-1)*4128.950345*sin(delta)) end proc

(sorry for the formatting)

plot(II[C](delta), delta = -Pi .. Pi)

(This works just fine and produces a nice plot, then I continue)

f1 := plot(II[C](delta), delta = -Pi .. Pi)

Shortcut Key to Flip Between Tabs

andrewfortune — Sun, 04 Mar 2012 21:16:11 Z

Hi,

I asked a similar question some time ago : http://www.mapleprimes.com/questions/123925-Shortcut-Key-AltShiftF6.

I'm still on Maple 13, and I still have not found a way to switch between tabs/windows using the keyboard.I am in the one Maple session (ie I haven't started a new one).

I tried all suggested combinations, including all combinations of Ctrl, Alt and Shift...

Solving linear equations

Okimatsuki — Fri, 02 Mar 2012 11:52:49 Z

Hi, can anyone help me with this questions? Thanks!

Use maple to find the general solution to the following system of linear equations:

2x₁ + x₂ - x₃ +3x₄ = 2

x₁ + 2x₂ -x₄= -1

3x₁ +2x₂ -2x₃+x₄ = 1

Maple freezes whenever I try to plot

hellisforheroes659 — Sat, 25 Feb 2012 13:29:20 Z

Hi,

Im not sure if anyone can help but whenever I plot a graph maple freezes. It looks like the program just refuses to plot it and repeats the command until i get to past where the graph should be at which time it goes back to working fine.

Another way of describing the error is, whenever i...

code efficiency

ABond — Wed, 22 Feb 2012 15:40:26 Z

Dear all,

Some time ago I asked a question concerning the algorythm for numerical dsolve and related issues here.

I got a nice answer from pagan and implemented the algorythm.

However, since my system is big, the iterations take long time.

Here is the code itself:

sys1:=[TRIC[1],TRIC[2],TRIC[3],TRIC[7],TRIC[8],TRIC[9]]:
> sys2:=[TRIC[4],TRIC[5],TRIC[6],TRIC[10],TRIC[11],TRIC[12]]:
> GRAD:=subs(u=FF[1](t),a=FF[2](t),k=k(t),tau=tau(t),psi[1...

Why are my help pages missing

CodeKingPlusPlus — Sun, 19 Feb 2012 13:43:36 Z

Hey everyone,

When I type ?command to view help pages, Maple always says "No Matches Found." For example, when I enter the command ?plot to bring up a help page on plots, Maple will say "No Matches Found."

How do I obtain the Maple help files?