Answered

Creating new matrix from the second column of other matrices

new_matrix = [PIV_1(:,2),PIV_2(:,2),...,PIV_10918(:,2)] Quite much to write ... You should have worked with one 10918x1000x4 ...

Creating new matrix from the second column of other matrices

new_matrix = [PIV_1(:,2),PIV_2(:,2),...,PIV_10918(:,2)] Quite much to write ... You should have worked with one 10918x1000x4 ...

14 hours ago | 0

Answered

Generate Independent Identically and Lognormally Distributed Random Variables

Note that mu and sigma you supply for "lognrnd" are not mean and standard deviation of the underlying lognormal distribution, bu...

Generate Independent Identically and Lognormally Distributed Random Variables

Note that mu and sigma you supply for "lognrnd" are not mean and standard deviation of the underlying lognormal distribution, bu...

16 hours ago | 0

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Answered

Why do I get the error “Dimensions of arrays being concatenated are not consistent.”?

T = [ cos(d), -sin(d)*cos(b), sin(d)*sin(b), a*cos(d); sin(d), cos(d)*cos(b), -cos(d)*sin(b), a*sin(d); 0, sin(b),...

Why do I get the error “Dimensions of arrays being concatenated are not consistent.”?

T = [ cos(d), -sin(d)*cos(b), sin(d)*sin(b), a*cos(d); sin(d), cos(d)*cos(b), -cos(d)*sin(b), a*sin(d); 0, sin(b),...

3 days ago | 0

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Answered

Generating random variable from certain standard deviation and mean

n = 100; x = 0.3*randn(n,1) generates 100 normally distributed random numbers with mean 0 and standard deviation 0.3.

Generating random variable from certain standard deviation and mean

n = 100; x = 0.3*randn(n,1) generates 100 normally distributed random numbers with mean 0 and standard deviation 0.3.

3 days ago | 1

Answered

How to compute numerical gradient of an unknown function in matlab Simulink?

The i'th component gi of the gradient vector g is approximately given by gi = (f(x1,...,xi+h,...,x10)-f(x1,...,xi,...,x10))/h ...

How to compute numerical gradient of an unknown function in matlab Simulink?

The i'th component gi of the gradient vector g is approximately given by gi = (f(x1,...,xi+h,...,x10)-f(x1,...,xi,...,x10))/h ...

4 days ago | 0

Answered

Having Trouble Using For-Loop Over Distributed Range with ODE45

delta1 = @(t) (t<=1200) delta0 = @(t) (t>1200) ODE = @(t,x,gamma,psi,beta) [delta1(t)*(-gamma)*x(1) + delta0(t)*psi*x(1); beta...

Having Trouble Using For-Loop Over Distributed Range with ODE45

delta1 = @(t) (t<=1200) delta0 = @(t) (t>1200) ODE = @(t,x,gamma,psi,beta) [delta1(t)*(-gamma)*x(1) + delta0(t)*psi*x(1); beta...

6 days ago | 3

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Answered

Substitution of initial numerical values before odefunction

Use "matlabFunction" to convert every symbolic input to ODE45 into numerical function handles before calling ODE45.

Substitution of initial numerical values before odefunction

Use "matlabFunction" to convert every symbolic input to ODE45 into numerical function handles before calling ODE45.

6 days ago | 0

Answered

How do I maximise Volume of a cylinder such that its Surface Area is less than 10 using fmincon by predicting only either radius or height but not both?

Not possible. Since r and h are interdependent, "fmincon" must be able to vary both and thus predict them simultaneously. Of co...

How do I maximise Volume of a cylinder such that its Surface Area is less than 10 using fmincon by predicting only either radius or height but not both?

Not possible. Since r and h are interdependent, "fmincon" must be able to vary both and thus predict them simultaneously. Of co...

7 days ago | 0

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Answered

this code is for calculating the probability of attack success represent for the equation A, i need to change it to calculate the probability of attack success for the equation B:where q =[0.1 ,0.2 , 0.3, 0.4 , 0.5] and p= 1-q and Z= 6

function main q1a = [0.1 0.2 0.3 0.4 0.5]; q2a = [0.1 0.2 0.3 0.4 0.5]; z = 6; vec = zeros(1,z); for i = 1:numel(...

this code is for calculating the probability of attack success represent for the equation A, i need to change it to calculate the probability of attack success for the equation B:where q =[0.1 ,0.2 , 0.3, 0.4 , 0.5] and p= 1-q and Z= 6

function main q1a = [0.1 0.2 0.3 0.4 0.5]; q2a = [0.1 0.2 0.3 0.4 0.5]; z = 6; vec = zeros(1,z); for i = 1:numel(...

7 days ago | 0

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Answered

How to fix "Index exceeds the number of array elements (1)"?

for i=1:length(L) psi0= psi(i); L0 = L(i); To=[cosd(psi0) sind(psi0) 0; -sind(psi0) cosd(psi0) 0; 0 0 1]; Tg=[To ze...

How to fix "Index exceeds the number of array elements (1)"?

for i=1:length(L) psi0= psi(i); L0 = L(i); To=[cosd(psi0) sind(psi0) 0; -sind(psi0) cosd(psi0) 0; 0 0 1]; Tg=[To ze...

7 days ago | 1

Answered

How to fit multivariable equation?

coeffs = [inputs, ones(size(inputs,1),1)] \ outputs

How to fit multivariable equation?

coeffs = [inputs, ones(size(inputs,1),1)] \ outputs

7 days ago | 0

Answered

I need help in this question please?

y(t) = sum_{i=0}^{Inf} a_i*t^i y'(t) = sum_{i=1}^{Inf} i*a_i*t^(i-1) y''(t) = sum_{i=2}^(Inf} i*(i-1)*a_i*t^(i-2) Set y''(t)+...

I need help in this question please?

y(t) = sum_{i=0}^{Inf} a_i*t^i y'(t) = sum_{i=1}^{Inf} i*a_i*t^(i-1) y''(t) = sum_{i=2}^(Inf} i*(i-1)*a_i*t^(i-2) Set y''(t)+...

8 days ago | 0

Answered

How to calculate the (odd ,even) condition in the following Poisson distribution for p_z parameter? i need some help in the code bellow

function main p1 = 0.9; p2 = 0.8; q1 = 1-p1; q2 = 1-p2; z = 6; vec = zeros(1,z); vec(1:2:end) = q1/p1; v...

How to calculate the (odd ,even) condition in the following Poisson distribution for p_z parameter? i need some help in the code bellow

function main p1 = 0.9; p2 = 0.8; q1 = 1-p1; q2 = 1-p2; z = 6; vec = zeros(1,z); vec(1:2:end) = q1/p1; v...

11 days ago | 1

Answered

Lagrange Interpolating Polynomials using Matlab

You must use a fitting tool, not an interpolation tool to solve your problem. Apply "polyfit" with x-values = Generation Output...

Lagrange Interpolating Polynomials using Matlab

You must use a fitting tool, not an interpolation tool to solve your problem. Apply "polyfit" with x-values = Generation Output...

11 days ago | 0

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Answered

CDF of rain rate

https://stackoverflow.com/questions/36385036/how-to-make-a-cdf-from-a-histogram-in-matlab

CDF of rain rate

https://stackoverflow.com/questions/36385036/how-to-make-a-cdf-from-a-histogram-in-matlab

11 days ago | 0

Answered

How to define a variable as an integer that's equal to or greater than zero?

rest = mod(struct_idx,4); if rest == 1 ... elseif rest == 2 ... elseif rest == 3 ... elseif rest == 0 ... end

How to define a variable as an integer that's equal to or greater than zero?

rest = mod(struct_idx,4); if rest == 1 ... elseif rest == 2 ... elseif rest == 3 ... elseif rest == 0 ... end

11 days ago | 0

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Answered

Matlab code for delay differential equations

https://de.mathworks.com/help/matlab/delay-differential-equations.html

Matlab code for delay differential equations

https://de.mathworks.com/help/matlab/delay-differential-equations.html

11 days ago | 1

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Answered

How to solve this equation which contains complex number, bessel equation and its derivative?

x0 = [2; 1]; fun = @(x)[real(1i*besselj(1,complex(x(1),x(2)))-complex(x(1),x(2)).*(besselj(0,complex(x(1),x(2)))-besselj(2,...

How to solve this equation which contains complex number, bessel equation and its derivative?

x0 = [2; 1]; fun = @(x)[real(1i*besselj(1,complex(x(1),x(2)))-complex(x(1),x(2)).*(besselj(0,complex(x(1),x(2)))-besselj(2,...

12 days ago | 1

Answered

Finite difference method - solving boundary conditions

y1(1) - 1.0 = 0 (y1(i+1)-2*y1(i)+y1(i-1))/dx^2 - (2*(y1(i+1)-y1(i-1))/(2*dx)/(1-x(i)) + y1(i)/(x(i)^2*(1-x(i))^2)*(y1(i)^2-1+(y...

Finite difference method - solving boundary conditions

y1(1) - 1.0 = 0 (y1(i+1)-2*y1(i)+y1(i-1))/dx^2 - (2*(y1(i+1)-y1(i-1))/(2*dx)/(1-x(i)) + y1(i)/(x(i)^2*(1-x(i))^2)*(y1(i)^2-1+(y...

14 days ago | 0

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Answered

How to enforce ode15s to solve a DAEs system with some state variables limited by a range?

The solution of your problem is uniquely determined by the equations you impose - you can't impose any further conditions on the...

How to enforce ode15s to solve a DAEs system with some state variables limited by a range?

The solution of your problem is uniquely determined by the equations you impose - you can't impose any further conditions on the...

15 days ago | 0

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Answered

Solving boundary value problem for nonlinear differential equation using method of collocation - Gauss sites

Up to my experience, the FORTRAN code "colnew" and "colsys" developed by Ascher are still the best bvp solvers available. Searc...

Solving boundary value problem for nonlinear differential equation using method of collocation - Gauss sites

Up to my experience, the FORTRAN code "colnew" and "colsys" developed by Ascher are still the best bvp solvers available. Searc...

18 days ago | 0

| accepted

Answered

How to solve a set of DAEs with multiple dependent differential variables

The Euler equations are not thus easy to solve. You should consult a book on numerical methods for the equations of gas dynamic...

How to solve a set of DAEs with multiple dependent differential variables

The Euler equations are not thus easy to solve. You should consult a book on numerical methods for the equations of gas dynamic...

18 days ago | 0

Answered

Boundary condition in non-linear ODE

function du = ode4(eta,u) theta = u(1); Sr = u(2); % beta dtheta = u(3); % d(theta)/dr ...

Boundary condition in non-linear ODE

function du = ode4(eta,u) theta = u(1); Sr = u(2); % beta dtheta = u(3); % d(theta)/dr ...

18 days ago | 1

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Answered

How can I create a loop for this equation?

L = cumsum(demand); L = L./(1:numel(L)); L = L(4:12)

How can I create a loop for this equation?

L = cumsum(demand); L = L./(1:numel(L)); L = L(4:12)

19 days ago | 1

Answered

How to solve a non-linear system of difference equations ?

Call "fsolve" repeatedly to get (S3,K2,E2), (S4,K3,E3), ... (S(t+2),K(t+1),E(t+1)) A(t) = A(1)*(1+a)^(t-1) is obvious.

How to solve a non-linear system of difference equations ?

Call "fsolve" repeatedly to get (S3,K2,E2), (S4,K3,E3), ... (S(t+2),K(t+1),E(t+1)) A(t) = A(1)*(1+a)^(t-1) is obvious.

20 days ago | 0

Answered

Nested loop problem with the second index

cp = zeros(length(cpx)*length(cpy),2); row = 0; for i = 1:length(cpx) for j = 1:length(cpy) row = row + 1; ...

Nested loop problem with the second index

cp = zeros(length(cpx)*length(cpy),2); row = 0; for i = 1:length(cpx) for j = 1:length(cpy) row = row + 1; ...

20 days ago | 0

Answered

how to solve differential equation when the derivative is in right and left side of the equation.

MATLAB solves ODE systems of the form A(t,x)*dx = f(t,x) So put all dx terms on the left-hand side, determine the matrix A and...

how to solve differential equation when the derivative is in right and left side of the equation.

MATLAB solves ODE systems of the form A(t,x)*dx = f(t,x) So put all dx terms on the left-hand side, determine the matrix A and...

21 days ago | 0

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Answered

How to plot a continuous graph from distinct points.

x=[1 3 5 6]; y=10*ones(size(x)); plot(x,y,'o')

How to plot a continuous graph from distinct points.

x=[1 3 5 6]; y=10*ones(size(x)); plot(x,y,'o')

25 days ago | 0

Answered

Matlab code for boundary condition

So you mean at x=0, you have y = 0 and dy/dx + dz/dx at x=infinity, you have y=1 and z = b and at t = 0, you have y = 1, z...

Matlab code for boundary condition

So you mean at x=0, you have y = 0 and dy/dx + dz/dx at x=infinity, you have y=1 and z = b and at t = 0, you have y = 1, z...

26 days ago | 0

Answered

How to find the X-coordinate of the plot knowing the Y-value?

[~,index] = max(max0); frequency_value = f(index)

How to find the X-coordinate of the plot knowing the Y-value?

[~,index] = max(max0); frequency_value = f(index)

26 days ago | 0

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