Answered
initial condition vector longer than ODE vector?
Do it like this: a=2; b=5; % v0 is now set to 10 v0=10; % Using a,b to determine rest of variables R=10*a; C=0.0001...

12 maanden ago | 1

| accepted

Answered
Can some one fix this code? I am unable to understand this code? Though fixing one problem another problem is arising ! please help!
In the following line: G = (randn(Np,Mtot)+1j*randn(Np,Mtot))/sqrt(2); % When i=1, G is 1x20, but H is 20x2 so the following l...

12 maanden ago | 0

Answered
Connect all dots I polarplot
Like this? r=[10:36:360 10]; r = r/360*2*pi; s=[5,3.5,5,4,4,3.5,4,4.2,4.7,4, 5]; polarplot(r,s,'-x')

12 maanden ago | 0

Answered
I dont understand this error in line 653 and the end goal is to make a graph
Get rid of the gaps between Consibio and Cloud, and between Cloud and Datalog (In the file name and when calling it).

12 maanden ago | 0

Answered
How can I solve the following PDE?
Try setting tau = T - t, so that dA/dt = -dA/dtau etc, and A(T) , B(T) become A(0), B(0). i.e. turn the boundary value problem ...

12 maanden ago | 0

Answered
how to use ode45 to solve motion equation with Matrix
Does this help? %% Data M =[ 0.0210 0.0014 -0.0209 0 0 0 0 0 0.0014 ...

12 maanden ago | 1

| accepted

Answered
Subscript indices must either be real positive integers or logicals always show up. what should i do?
Well, this works, but you might want to check the correctness or otherwise of your mode_shape calculations (there are a lot of z...

12 maanden ago | 1

Answered
incorrect number or types of inputs or outputs for function 'int'
Replace your power calculation with power = (1/T_0) * trapz(t,y.^2); Edited - Walter is correct.

bijna een jaar ago | 0

Answered
Regula-falsi Method that keeps running
Brackets!! f = @(x) 2.^x - x.^2 - 2; % Function whose roots are desired xL = 4; xU = 5; % Initial guesses Tol = 1...

ongeveer een jaar ago | 0

| accepted

Answered
Trying to answer a math problem using newton's method but having problem in the function.
Matlab doesn't like implied multiplication (x ^ 2)z should be (x ^ 2)*z etc. Also, in Matlab log(x) is ln(x)

ongeveer een jaar ago | 0

| accepted

Answered
How to set multiple values of a threshold?
Here's one way: tolX1_4 = [1 1 1 1 1 -1 1 1 0 1 1 1 1 1 1 1 1 ...

ongeveer een jaar ago | 0

| accepted

Answered
Please help solve a system of differential equation
Here's a numerical approach: First manipulate the equations tspan = [0, 120]; ic = [80000, 0.001]; [t, xy] = ode45(@rate, ...

ongeveer een jaar ago | 0

Answered
how ode solver works
doc ode45 Go to the References section. The two references listed will supply you with all you need to know about the ode solv...

ongeveer een jaar ago | 0

Answered
Solve Differential Equation with initial conditions and function
Try modifying your if statement in Moment. Something like if x<a V =...; M = ...; elseif x>=a && x<L M = ... ...

ongeveer een jaar ago | 0

Answered
problem in creating function file using ode45
Are you looking for something like this? (I might have misinterpreted your equations!) O=1; a=pi/2; g=9.81; L=100; tspan ...

ongeveer een jaar ago | 0

Answered
how can eliminate negative data in erf function?
Should term2(i) = (sqrt(lemdaD)./(2.*e1(i))).*exp(-(v1(i).*sqrt_avgsnr - v2(i).* mu).^2./(2.*e1(i).^2)).*.... erf((e4(...

ongeveer een jaar ago | 0

| accepted

Answered
Why is my plot not showing for improved Euler method?
You need to keep track of each step. Your original simply overwrites the values of t and y at each step. dy=@(t,y) -(0.1/10^(1...

ongeveer een jaar ago | 1

Answered
Why I couldn't plot this graph f=(@(x,y) (x.^2)+(x*y)+(y.^2)<=68200.^2/3);
This will give you the outline (I've assumed you want 68200^(2/3) rather than 68200^2/3) f=@(x,y) x.^2+x.*y+y.^2-68200.^(2/3); ...

ongeveer een jaar ago | 0

Answered
I want to solve a simple "y=mx+c" with initial condition to find value of "m" and "c" but i am getting error by using following code. Any idea to tackle this kind of problem?
These are simple linear equations in m and c so set: X = [x(1) 1; x(2) 1]; Y = [y(1); y(2)]; and solve using X\Y to get m a...

ongeveer een jaar ago | 0

Answered
I have been trying to code a solar pv module for 1 diode model, the following is my code, can someone tell me the mistake ive made and the correction to it pls.
Like this? Note: I've made kref positive to avoid the I's being complex. This might be completely incorrect!! Pmpp = 50; ...

ongeveer een jaar ago | 1

| accepted

Answered
Reorganization of data in matrix
Like this? M = [1 1 0.270588872500870 1 1 0.191034400222846 1 1 0.316821350897659 1 1 0.391794699189989 1 2...

ongeveer een jaar ago | 0

Answered
LogLog Plot is Blank
Like this? (I've assumed you want log base 10 everywhere): %Paschen Curve Plotting for H2 p = 1.2; %Torr d = 20; %cm GamSE ...

ongeveer een jaar ago | 1

Answered
How to combine multiple numbers into 1 number?
Do you mean R1 = 2; R2 = 4; Zr1 = [0 0 0]; R = R1*10^4+R2*10^3+Zr1(1)*10^2+Zr1(2)*10+Zr1(3) Alternatively: R1 = 2; R2 = 4; Z...

ongeveer een jaar ago | 0

Answered
Runge Kutta Fourth order and Interpolation
Shouldn't f1 = @(z,r,ed,p11,m11) -(ed+p11)*z*m11.^3 *((r+1)./(((ed+p11)*(r.^2 +z.^2).^6) -(r/p11))) ./(2*pi*(r.^2 + z.^2)) ; ...

ongeveer een jaar ago | 0

Answered
Newton Raphson method for a system of non-linear equations?
Here's a simple example for you to follow: % Functions f = @(x,y) x^2 + y - 5.94; % i.e. the equation is x^2+y=5.94 g = @(x,...

ongeveer een jaar ago | 0

| accepted

Answered
No feasible solution in optimisation in linprog
I don't know if this will fix your problem, but I think the first number in the second row of A1 should be 8 not 2.

ongeveer een jaar ago | 0

Answered
Simple relaxation method Matlab
For the simple relaxation technique to work the A matrix needs to be diagonally dominant. Your A is not diagonally dominant - s...

ongeveer een jaar ago | 0

| accepted

Answered
Solve a system of 3 second order equations
Write your equations as 6 first order equations like so: where I've assumed you have pre-defined omegaout and thetaout as fun...

ongeveer een jaar ago | 0

Answered
Unable to solve nonlinear equation using fsolve as the message shows No solution found
fminsearch makes a reasonable attempt: F1 = @(a,b) -9.135789053E+00-log(a)+166.2509975*a+5.84074229*b+... -166.2509975*a^2...

ongeveer een jaar ago | 2

Answered
How to solve and plot this set of differential equations?
If rho starts at 0, then drho/dtheta will be zero and rho will not change from zero according to your first ode. If rho and drh...

ongeveer een jaar ago | 0

Load more