Answered
merge two matrices after odd rows
Here's one way: A=[1 1;1 1;1 1]; B=[2 3;4 5;6 7]; AB = [A B]'; C = reshape(AB,2,6)'

4 years ago | 0

Answered
Hello, I am trying to solve the ODE but I have an error I do not understand how to solve. Would appreciate some help. Thank you!
Like this? %% ODE45_estimation % ------ Constants ------ % m = 1248.5; g = 9.81; W = m*g; S = 17.1; % ------ Time int...

4 years ago | 0

Answered
plotting Solid of revolution of a function
How about: X = 0:0.1:pi; R = sin(X); [z,x,y] = cylinder(R); surf(x,y,z)

4 years ago | 2

Answered
Split an array using specific points
Like this? Y = [5;2;3;6;7;9;5;5;6;3;8;7;74;9;63;47;10;3]; diiv = [5; 9; 15]; y1 = Y(1:diiv(1)); y2 = Y(diiv(1)+1:diiv(2)); ...

4 years ago | 1

Answered
Algorithm for Fractional power calculation
How about using the Newton-Raphson algorithm. Here's the basic idea: % x^n = b % Let f(x) = x^n - b % dfdx(x) = n*x^(n-1) %...

4 years ago | 0

Answered
Stochastic differential equation Gompertz plotting a graph
You have x(1) = 0, so log(x(1)) is -Inf, which means that subsequent values of x will be NaNs.

4 years ago | 0

| accepted

Answered
Defining integration function in matlanb
Like this? % If Cp is a constant then the integral is just Cp*T % If it is a function of T, then define the function: Cp = @(...

4 years ago | 0

Answered
Plotting and coding problems
More like this perhaps: T = 300:0.5:500; w = 0.224; Tc = 304.2; ...

4 years ago | 0

Answered
I am getting error, "array indices must be positive or logical integer values". Please help
You need multiplication signs between n and (w1+k) in calculations of u and z: [X,Y] = meshgrid(-4:0.2:4); n=2; k=1; %n=1,...

4 years ago | 0

Answered
Need help in finding all the solutions of non linear ellipse equations using Newtons Method using following code.
Check your Jacobian equations, especially the term: 2*x(1)+2*x(1)+4; I think this should be 2*x(1)+2*x(2)+4;

4 years ago | 1

Answered
Displayin command just once for the n number of iterations
What about if k == 0 disp("Hello World!") elseif k == 480 disp("Bye Bye World!") end

4 years ago | 0

Answered
Index in position 1 is invalid. Array indices must be positive integers or logical values.
In line V(i,j+1) = ((1-2*s-k).*V (i,j))+ (s.*(V (i-1,j) + V (i+1,j))) - (k.*(Rm.*Iinj+Vrest)); you have V (i-1,j). When i is ...

4 years ago | 0

| accepted

Answered
What is the way of solving the noise added differential equations in matlab?
Try to avoid the (mis)use of global! %% ----------------INPUT PARAMETERS--------------------------- f=0.33; alpha=0.5; w0=sqrt...

4 years ago | 0

| accepted

Answered
Unable to perform assignment because the left and right sides have a different number of elements.
Like this? clear %Vmax values for each reaction step v1=0.01:0.01:2; v2=1; %Km values for each reaction step K1=1; K2=1; ...

4 years ago | 0

| accepted

Answered
How do I create a stacked plot like attached figure using subplot command ?
Try help stackedplot

4 years ago | 0

| accepted

Answered
Second order equations. Cauchy task
More like this: % Write equations as follows: % dudx = v u(0)=-1 % dvdx = -v/4-6u v(0)=0 % % Then you hav...

4 years ago | 1

| accepted

Answered
Runge Kutta 3 ODE
You can't have t(i)=t(0)+i*h; indices must be a positive integer - you have t(0), Matlab doesn't like this!

4 years ago | 0

| accepted

Answered
Why it is saying this? Index in position 2 is invalid. Array indices must be positive integers or logical values. Error in Homework (line 21) surf(x,y,F(i,j))
Like this x=[-5:5]; y=[-5:5]; for i=1:numel(x) for j=1:numel(y) if (x(i)>=0)&&(y(j)>=0) F(i,j)=2.*x(i)+y(j)^2; en...

4 years ago | 0

| accepted

Answered
Definite integral with parameter
You could try something like this: a = 0.043478; q = 100; % Ha W = 40; t = 4; c = @(x,Fa )(5.*x.^2-Fa.*x)./(((a.*x+q).*W-((...

4 years ago | 0

| accepted

Answered
Integration of a joint pdf with for loop?
When k = 1and i = 1 then k-i = 0, therefore the second index in fun(i,k-i) is 0, but indices must be positive integers in Matlab...

4 years ago | 0

Answered
How would you I write a matlab function for theta that represents the 2nd order differential of the torque equation?
Does this help? % Theta seems to have two components, so: D(theta) = [p1+p2+2*p3*cos(theta(2)) p2+p3*cos(theta(2)); ...

4 years ago | 1

| accepted

Answered
Error message with arrays
You only need h = [2:20:220]; t_a = 293; q_flux = 800; n = length(h); y = q_flux./h+t_a; i = i+1; plot(h,y)...

4 years ago | 0

Answered
How to solve two coupled differential equations using ode45.
"Why is my previous code is not working properly by treating the problem to be a DAE." I don't know! "Also I noticed you wrote...

4 years ago | 1

Answered
Multiple Anonym Function return wrong values
Here's one solution: C = [4622 5480 18923]*1e-12; U = [454e3 454e3-20e3 20e3].*sqrt(2); W = Energy(C,U); disp(W) function W...

4 years ago | 0

| accepted

Answered
Hi, is it possible to have variables in an ode45 that varies according to another function?
Put something like [T, p, rho, speedsound] = atmos(height); immediately after height = x(1); in function dynameqn. Not sur...

4 years ago | 0

Answered
root finding and plot of graph
Are you looking for something like this? hi = 1e-6; lo = 1e-9; n = 500; dt = (hi-lo)/n; t3 = lo:dt:hi; y = f(t3); subplo...

4 years ago | 0

Answered
Calculator result and MATLAB result are different
Have you checked that both are using degrees, or both radians? The Matlab as you've written it is using radians (use sind(24) a...

4 years ago | 1

Answered
How can I rotate a set of points by an angle around its origin?
Do you mean like this? ITM = [461400.0758 617474.3059 461400.8069 617475.4609 461400.8069 617475.4609 461402.3069 617477.633...

4 years ago | 1

| accepted

Answered
Unable to perform assignment because the indices on the left side are not compatible with the size of the right side.
Try replacing x(4) = Velocities(3608.9,5249.3); by x(4,:) = Velocities(3608.9,5249.3); Same for x(5).

4 years ago | 0

Answered
Removing zeros from matrix
Like this? A = [1 2 3 4 5 6; 1 2 3 4 5 6; 1 2 3 4 5 0; 1 2 3 4 0 0; 1 2 3 0 0 0]; B = A'; B=B(:); B(B==0)=[]

4 years ago | 0