**How to solve simulate/ solve difference equation in Matlab?**How can I simulate or solve this kind of difference equation?
x(k+2)-7x(k+1)+12x(k)=0
A for loop would work nicely. This particular system is unstable.
-James
Tama Tomi wrote:
> How can I simulate or solve this kind of difference equation?
>
> x(k+2)-7x(k+1)+12x(k)=0
Can you give me a example?
James Allison <james.allison@mathworks.com> wrote in message <hmr9fp$62s$1@fred.mathworks.com>...
> A for loop would work nicely. This particular system is unstable.
>
> -James
>
> Tama Tomi wrote:
> > How can I simulate or solve this kind of...

**Can Matlab solve a system of equations contain one pde(1-D) equation and 3 ode equations by the pdepe solver?**I have a system of equations contains one one-dimensional pde and
three ode. Can it be solved by the 'pdepe' solver?
If it can,how do I treat the boundary function of odes?
...

**Matlab program to solve wave equation up to linear system of equations**New in matlab, Need help please in making a matlab program to solve the wave equation below up to the point when you obtain a system of equations.
solve the wave equation below up to the system of equation using Finite difference method
utt = c^2 uxx, ut(x,0) = 3sin((pi x)/9) , u(x,0) = 0, U(0,t) = U(4,t) = 0,
hx = 1, ht = 0.5, c = 2, nx = 4, nt = 2
nx, hx are number and size of x panels
nt, ht are number and size of t panels
I am using the Finite difference scheme below
u(i,j+1) = c^2*(ht/hx)^2 *(u(i+1,j) + u(i-1,j)) - u(i,j-1) + 2*(1 - c^2*(ht/hx)^2 )*u(i,j)
"Kayanja Andy...

**Solving Coupled Equations of the form Nonlinear Schrodinger Equation using Matlab**I'm doing a fourth year project...Im just starting out and was
wondering if anyone would have any suggestions on where to start for
this topic....
Melissa wrote:
>
>
> I'm doing a fourth year project...Im just starting out and was
> wondering if anyone would have any suggestions on where to start
> for
> this topic....
Hi
GP Agrawal 's book on NL fiber is good start..
Dr. Abhay Kumar
>
>
4 years?
I had to solve this problem in 6 months....
(NLSE + a constitutive equation which correlates the optical field to
another physical quantity present i...

**solving an equation in matlab**Hi, I wanted to know if there were any inbuilt commands in matlab to
solve the equation of the form f(x)=0 numerically. The function f(x)
is composed of user written functions. I would really appreciate any
help of this as I need it for some urgent work.
Thanks.
In article <ef26062.-1@webx.raydaftYaTP>, "Apoorva Shende" <apoorvashende@indiatimes.com> wrote:
> Hi, I wanted to know if there were any inbuilt commands in matlab to
> solve the equation of the form f(x)=0 numerically. The function f(x)
> is composed of user written functions. I would really apprecia...

**how to solve equations with matlab**Hi guys
I want to solve this kind of equation:
a*x + b*y = A (1)
a1*x^2 + b1*y^2 = B (2)
Thanks in advanced
Zhong
zhang skrev 2010-01-02 02:17:
> Hi guys
>
> I want to solve this kind of equation:
>
> a*x + b*y = A (1)
> a1*x^2 + b1*y^2 = B (2)
>
> Thanks in advanced
>
> Zhong
See for example:
http://www.mathworks.com/support/solutions/en/data/1-15NRJ/index.html
On Jan 1, 8:17=A0pm, "zhang " <xiao...@gmail.com> wrote:
> Hi guys
>
> I want to solve this kind of equation:
>
> a*x + b...

**how solving equation by matlab**hi
how can i use matlab to solve equations
with my best wishs
mido wrote:
> hi
> how can i use matlab to solve equations
> with my best wishs
This question needs to be refined a bit.
Do you want to solve simultaneous systmes of linear equations?
Do you want to solve differential equations?
Do you want solve an equations by finding the zeros?
Those are just the first few possibilities that come to mind. If I
spent a little more time, I'm sure I could come up with another
half-dozen (or more) possibilities.
That said, I would *strongly* urge you to read the "Getting ...

**Solving simultaneous equations in matlab**Hi,
I am trying to solve simulataneous equations to create a curve by plugging in the variables a and b into the equation Sscaled = a*Sraw + b;
HT = [32.9 32.4 34.8 35.6];
LT = [19.8 26.6 29.5 30.3];
The equations to solve a and b is
a = - (b/LT);
b= 1/((HT*(a))+b;
How can I solve the equations with two unknowns simultanously to plug into the Sscaled = a*Sraw +b;
Thank you
On Nov 19, 4:42=A0pm, "Yvonne " <h...@waikato.ac.nz> wrote:
> Hi,
>
> I am trying to solve simulataneous equations to create a curve by pluggin=
g in the variables a and b in...

**solving differential equation**Hi,
I need some help with this problem:
Equation:
A(d^2 U)/(dx^2 )+BU+CG(x,y)=0
Parameters:
A,B,C - known scalars, U(x,y) is a function (2D matrix), G(x,y) is a known 2D matrix.
Surface:
rectangle: x axis: [0,300]. y axis: [0,1000].
Boundary conditions:
Side 1 (x=0): dU/dx=0.
Side 2 (y=1000) and side 4 (y=0): U(x,0)=U(x,1000).
Side 3 (x=300): U(300,y)=0.
I can solve this equation analytically, but I would like to solve it with the finite elements method in order to be able to do it on different surfaces.
Thanks,
Yossi
> Hi,
>
> I need some help with this problem:
> Equation:...

**Solving 3 equations in Matlab**Hello, I`m having trouble solving equations simultaneously in Matlab. I have three equations and three unknowns. Two equations are algebraic and one is a differential equation. Here are my three equations, any help would be appreciated:
1. (0.3*1.06*3348*Ttank)-(0.3*1.06*3348*Toutc)+(20*200*(sin(t/24*3.14))^8=0
2. (0.041*4418*20)-Toutw*4418*0.041+1000*((Ttank-20)-(Ttank-Toutw))/ln(Ttank-20)/(Ttank-Toutw)
3. 1.06*3348*1.5* dTtank/dt=0.03*1.06*3348*Toutc-0.03*1.06*3348*Ttank-1000*((Ttank-20)-(Ttank-Toutw))/ln(Ttank-20)/(Ttank-Toutw)
t is time and will simulate from 0 until 300. Intia...

**how to solve implicit equations in matlab**please anyone tell me how to solve following implicit equation in
matlab,
y tan(x)+ sqrt(65.25^2-y^2) -99=0
where x is known and is an array from 0 to 85 deg
Amit Bhetiwal <drdo.amitbhetiwal@gmail.com> wrote in message <65b2861a-d889-421f-99ca-f0d9caf59c2e@a28g2000prb.googlegroups.com>...
> please anyone tell me how to solve following implicit equation in
> matlab,
>
> y tan(x)+ sqrt(65.25^2-y^2) -99=0
> where x is known and is an array from 0 to 85 deg
The simple answer is fzero, coupled with a for loop.
Or, with just a wee bit of algebraic mani...

**equations system solving with matlab**Hi everyone. I have solved my last problem but I have a new one. I
try to solve a system of differential equations. After writing it
down and run it I write on the command window the following:
[z,y]=ode45(@sistema1,[0 2],[0 1 20 175.5 5.304 0.08 0.221])
My problem is that even though I write this initial values, matlab
takes zero for the initial value of all the variables.
Thank you for your help.
...

**solving equations in matlab simulnik**Hi,
In my current work, I have to calculate the intersection point of a fixed curve and a moving straight line (the line always cross a robot center point(a,b)) in matlab simulink. I tried some ways and failed:
Using matlab simulink->user-defined function->embedded matlab function:
code#1:
-----------------------------------------
function [f,g] = test2(a,b)
syms x y
[f,g]=solve(2*x^3+x*(1-2*b)-a,x^2-y);
-------------------------------------------
produces an error: "Command-duality is not supported". Many people say b/c simulink does not support Symbolic Math To...

**solving implicit equations with matlab?**Hi guys
Does somebody have an elegant idea to solve
an implicit equation (like y=exp(y)-3) numerically with matlab? Are
there any built in functions or do I have to program it by myself?
Appreciated
Eva
Eva Greens wrote:
> Does somebody have an elegant idea to solve an implicit equation
(like y=exp(y)-3) numerically with matlab? Are there any built in
functions or do I have to program it by myself?
one of the VERY MANY solutions:
you could use the <symbolic tbx>, eg,
res=solve('y=exp(y)-3')
% res =
% [ -lambertw(-exp(-3))-3]
% [ -lambertw(-1,-exp(-3))-3]
% f...

**Solving 4 equations in MAtlab**Hi there
I have the following 3 equations:
y1 = a1 + (a2*t^2)/(1+ a3*t +a4*t^2)
y2 = a2*t*(2+a3*t)/(1+ a3*t +a4*t^2)^2
y3 = -2*a2*(-1+3*a4*t^2 + a3*a4*t^2)/(1+ a3*t +a4*t^2)^3
I have the following values:
y1(33) = 1.025031777
y2(33) = 0.02973
y3(33) = -0.001465
y1(1000) = 1.8
How do I solve this system in Matlab to obtain a1,a2, a3
and a4?
Cheers
"Ashwath Sundaresan" <asu33@student.canterbury.ac.nz> wrote in message
<g1vj5a$gco$1@fred.mathworks.com>...
> Hi there
>
> I have the following 3 equations:
>
> y1 = a1 + (a2*t...

**solving equations system with Matlab**I want to solve an equations system such as:
dP/dz=4*x*s
x=2*P
s=5*x
If I create the system:
dy(1)=4*y(2)*y(3);
y(2)=2*y(1);
y(3)=5*y(2);
in an M-file and the try to solve it using for example ode45,Matlab
solves it, but taking y(2) and y(3) as constants. How must I write
the system in order to make it understand that they change?
Thank you for your help.
Reyes Alvarez wrote:
>
>
> I want to solve an equations system such as:
>
> dP/dz=4*x*s
> x=2*P
> s=5*x
>
> If I create the system:
>
> dy(1)=4*y(2)*y(3);
> y(2)=2*y(1);
> y(3)=5*y...

**Solving Transcendental Equations in Matlab**Hi
How do i solve transcendental equations in matlab. Is there built in function or do i have to write a code involving numerical techniques.
I want to solve for M
M=12.56/(6.28+(1/2M)+acos(sqrt(1-(1/M)^2))+M(1+sqrt(1-(1/M)^2)))
Is there any text book for solving nonlinear equations in matlab
Torsten Hennig <Torsten.Hennig@umsicht.fhg.de> wrote in message <28893072.11620.1245668013964.JavaMail.jakarta@nitrogen.mathforum.org>...
> > Hi
> > How do i solve transcendental equations in matlab. Is
> > there built in function or do i have to write a code
> > inv...

**how to solve this ode equation in matlab**Hi all,
I need to solve a system of higher order Ordinary Differential Equations in matlab,plz help me out,i cant find the tutorials for solving them.The equations are as follows
2X??+10X?+150X-5Y?-100Y=20Sin5t
3Y??+8Y?+120Y-5X?-100X=50Cos10t
it will be really helpful if you guys can solve the equations
Regards,
Krish
"phanikrishna kalapala" <krishna.kalapala@gmail.com> wrote in message
news:gd048t$i3i$1@fred.mathworks.com...
> Hi all,
> I need to solve a system of higher order Ordinary Differential Equations
> in matlab,plz help me out,i cant find the tutorials...

**how to solve this integral equation in Matlab?**
Integrate(some_function_of_(t), t from 0 to x) == constant.
Now I to find the solution x to the above integral function.
How to do this in Matlab?
thanks a lot!
In article <e9egvr$kq1$1@news.Stanford.EDU>, "Michael"
<michael.monkey.in.the.jungle@gmail.com> wrote:
> Integrate(some_function_of_(t), t from 0 to x) == constant.
>
> Now I to find the solution x to the above integral function.
>
> How to do this in Matlab?
>
> thanks a lot!
----------------------
If your integral has no convenient closed-form solution, why don't you
try ...

**solving Differential Equations in matlab**I have following Differential Equations
a1*x2+b2*x1-c*cos(int(x3))*x4=d
-c*cos(int(x3))*x2-a2*sin(int(x3))+b2*x4=0
where a1,b2,c,d,a2,b2 are constants and x1=theta_dot; x2=theta_ddot; x3=alpha_dot; x4=alpha_ddot
I want to solve these equations for x1,x2,x3,x4 and want to plot with time.
On 12 Okt., 09:23, "Vijay Marathe" <vijay_marath...@yahoo.co.in>
wrote:
> I have following Differential Equations
>
> a1*x2+b2*x1-c*cos(int(x3))*x4=d
> -c*cos(int(x3))*x2-a2*sin(int(x3))+b2*x4=0
>
> where a1,b2,c,d,a2,b2 are constants and x1=theta_dot; x2=theta_ddo...

**Newbie on Matlab**Dear All,
I am a new user to MATLAB and trying this out.
I have an equation defined as Vi that i need to solve for various values of V.
How do I write this out in MATLAB for the program to find the solutions for me? TIA.
Vi = V - Rs * (-(((Jsc * Suns - Vi/Rp)*Aactive)/(1- exp (Be (-sqrt(junc - Vb )/(junc - Vi ))))) + (Jo1 * Aactive * (exp(Vi/Vt)-1)) + (ID2 = Jo2 * Aactive * (exp(Vi/2*Vt)-1)))/Aactive
where V range from -0.7 to 0.7
"alvin wee" wrote in message <jl6ge7$edm$1@newscl01ah.mathworks.com>...
> Dear All,
> I am a new user to MATLAB and trying thi...

**Solve Binary Equations in Matlab**Hi,
I have a system of linear equations (binary equations) that I need to
solve. I am wondering if matlab can solve binary equations. (I am not
concerned about efficiency - I just want my job done, at the end of the
day.)
Anyway if matlab cannot deal with binary equations, can it convert
elements of a matrix to integers i.e. by multiplying each of them with
the inervse of the least non-zero element. (I am not sure what is this
called mathematically.)
I am not sure if my explanation is clear - so I provide an example. (I
am sorry I could not find a small example - I could not get this to
re...

**solving differential equation in matlab**write a program in matlab to show the variation of time constant with change in the capacitance of a series RC circuit(first order).value of R can be anything.input is C and outpur is time constant.also plot voltage across capacitance vs time.
avnish gaurav <avnish.gaurav@gmail.com> wrote in message <333925.1226579922939.JavaMail.jakarta@nitrogen.mathforum.org>...
> write a program in matlab to show the variation of time constant with change in the capacitance of a series RC circuit(first order).value of R can be anything.input is C and outpur is time constant.also plot voltage...

**solve quadratic equation in matlab**Hi.
Can I solve this quadratic equation in Matlab? If so, how?
(A - X)*B*(A - X)' = 1
A = [a1 a2 a3] and B is a 3x3-matrix. A and B are known. And X = [x x x] is unknown.
Thank you
"Cecilia " <ceciliaf@stud.ntnu.no> wrote in message <lran5e$db1$1@newscl01ah.mathworks.com>...
> Hi.
> Can I solve this quadratic equation in Matlab? If so, how?
> (A - X)*B*(A - X)' = 1
>
> A = [a1 a2 a3] and B is a 3x3-matrix. A and B are known. And X = [x x x] is unknown.
There are infinity solutions. Fors example if A = [0 0 0] and B = eye(3), any...