Beantwortet

Second order coupled differential equation

X0 = [0; 0; 0]; % initial conditions r = linspace(1, 50, 100); % resistance range tspan = linspace(0,100, 100); freq_vector...

Second order coupled differential equation

X0 = [0; 0; 0]; % initial conditions r = linspace(1, 50, 100); % resistance range tspan = linspace(0,100, 100); freq_vector...

16 Tage vor | 0

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Use of Fmincon for stress relax data

I suggest you read the examples for the different suitable solvers. They will show you exactly how to proceed for your case. Ma...

Use of Fmincon for stress relax data

I suggest you read the examples for the different suitable solvers. They will show you exactly how to proceed for your case. Ma...

16 Tage vor | 0

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How to use Matlab to generate a discrete uniformly distributed decimal with a value range of {0, 0.05} and a step size of 0.01?

n = 10; x = randi(6,n,1); x = (x-1)*0.01

How to use Matlab to generate a discrete uniformly distributed decimal with a value range of {0, 0.05} and a step size of 0.01?

n = 10; x = randi(6,n,1); x = (x-1)*0.01

17 Tage vor | 0

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use of pdepe for a space-dependent diffusivity

First: Don't name the vector "diff" since "diff" is an internal MATLAB function. Name it D, e.g. Second: To get the correct val...

use of pdepe for a space-dependent diffusivity

First: Don't name the vector "diff" since "diff" is an internal MATLAB function. Name it D, e.g. Second: To get the correct val...

17 Tage vor | 0

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If I have an array and I need to find an element in the array how do I go about it?

Compute 100*states(:,1)+10*states(:,2)+states(:,3) and use "find" to compare with C.

If I have an array and I need to find an element in the array how do I go about it?

Compute 100*states(:,1)+10*states(:,2)+states(:,3) and use "find" to compare with C.

18 Tage vor | 1

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Solve a differential equation and determine when it gets close to steady state

You can use an event function for the ODE integrator and stop integration when abs(dy/dt) (in your case abs(0.1 * (c-20) * (23-c...

Solve a differential equation and determine when it gets close to steady state

You can use an event function for the ODE integrator and stop integration when abs(dy/dt) (in your case abs(0.1 * (c-20) * (23-c...

18 Tage vor | 0

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the degradation of ozone in aqueous solutions (water). When I plot the all three components, the plot stays at the 0 value for all components.

There seems to be a singularity in the solution at t approximately 320. ProjectOzone() function ProjectOzone clc ki = 7e-3;...

the degradation of ozone in aqueous solutions (water). When I plot the all three components, the plot stays at the 0 value for all components.

There seems to be a singularity in the solution at t approximately 320. ProjectOzone() function ProjectOzone clc ki = 7e-3;...

19 Tage vor | 0

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The code below runs nonstop, and the results are not shown. why is that?

The code below runs nonstop, and the results are not shown. why is that? "solve" won't succeed for your system of equations bec...

The code below runs nonstop, and the results are not shown. why is that?

The code below runs nonstop, and the results are not shown. why is that? "solve" won't succeed for your system of equations bec...

20 Tage vor | 0

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Create number of for loops depending on size of N

The N columns of the resulting C-matrix contain i_first, i_second,... imax = 8; N = 4; i_average = (sum(0:N-1)/N+sum(imax:-1:...

Create number of for loops depending on size of N

The N columns of the resulting C-matrix contain i_first, i_second,... imax = 8; N = 4; i_average = (sum(0:N-1)/N+sum(imax:-1:...

20 Tage vor | 0

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How to make Matlab recognize that an expression rewritten by using subexpr() is equal to the original expression?

You have to resubstitute sigma by (a+b+c+d+e)^(1/2) in x_2 to compare with x: syms a b c d e f x x = a + (a+b+c+d+e)^(1/2) + c...

How to make Matlab recognize that an expression rewritten by using subexpr() is equal to the original expression?

You have to resubstitute sigma by (a+b+c+d+e)^(1/2) in x_2 to compare with x: syms a b c d e f x x = a + (a+b+c+d+e)^(1/2) + c...

20 Tage vor | 0

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plot the output c(t) using mathlab and show setting time on you graphf

Use "fplot" as done in your code above.

plot the output c(t) using mathlab and show setting time on you graphf

Use "fplot" as done in your code above.

20 Tage vor | 0

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Describe the solution trajectory of differential systems with mixed time-varying delay

To write your equations as a system of delay differential equations that can be handled by a MATLAB solver, set x3 = integral_{...

Describe the solution trajectory of differential systems with mixed time-varying delay

To write your equations as a system of delay differential equations that can be handled by a MATLAB solver, set x3 = integral_{...

20 Tage vor | 1

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Beantwortet

Plot between Nu vs Ra

Replace Ra_values = 10:100:100000; by Ra_values = (10:100:100000).';

Plot between Nu vs Ra

Replace Ra_values = 10:100:100000; by Ra_values = (10:100:100000).';

20 Tage vor | 0

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Resetting only a section of my state during event driven ode45 simulation

After the event has been triggered, control is returned to the calling program. If you want to continue integration with the e...

Resetting only a section of my state during event driven ode45 simulation

After the event has been triggered, control is returned to the calling program. If you want to continue integration with the e...

21 Tage vor | 1

Beantwortet

Index exceeds the number of array elements. Index must not exceed 1.

path_length_BS_IRS_reflect_UE(i) does not exist for i > 1 because path_length_BS_IRS_reflect_UE is a scalar value, namely 223.60...

Index exceeds the number of array elements. Index must not exceed 1.

path_length_BS_IRS_reflect_UE(i) does not exist for i > 1 because path_length_BS_IRS_reflect_UE is a scalar value, namely 223.60...

21 Tage vor | 0

Beantwortet

Dot indexing is not supported for variables of this type.

Test before your loop % Loop through each entry in the list and extract data for i = 1:numEntries dt(i) = dateti...

Dot indexing is not supported for variables of this type.

Test before your loop % Loop through each entry in the list and extract data for i = 1:numEntries dt(i) = dateti...

21 Tage vor | 0

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Beantwortet

How do I know what method Matlab is using when plotting ltiview?

I don't know Itiview nor risetime, but isn't there a literature link in the documentation for the function you are using ? If ...

How do I know what method Matlab is using when plotting ltiview?

I don't know Itiview nor risetime, but isn't there a literature link in the documentation for the function you are using ? If ...

22 Tage vor | 0

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How to solve algebraic equations for different values of variables ?

% Solve the equation eqn = Ac.*I.*eta-m.*c.*(Te-Ti)==0 for i=1:numel(eqn) s = solve(eqn(i),Te); S(i) = vpa(s(s>=0)); en...

How to solve algebraic equations for different values of variables ?

% Solve the equation eqn = Ac.*I.*eta-m.*c.*(Te-Ti)==0 for i=1:numel(eqn) s = solve(eqn(i),Te); S(i) = vpa(s(s>=0)); en...

22 Tage vor | 0

Beantwortet

function file used with 2 Matrices as input

You are not allowed to use the same name for the function and an output array. Thus rename one of them. And ln_AOU as output pa...

function file used with 2 Matrices as input

You are not allowed to use the same name for the function and an output array. Thus rename one of them. And ln_AOU as output pa...

23 Tage vor | 0

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Beantwortet

Solving a linear programming problem uising linprog

A = -[110 205 160 160 420 260;... 4 32 13 8 4 14;... 2 12 54 285 22 80]; b = -[2000; 55; 800]; Aeq = []; beq = ...

Solving a linear programming problem uising linprog

A = -[110 205 160 160 420 260;... 4 32 13 8 4 14;... 2 12 54 285 22 80]; b = -[2000; 55; 800]; Aeq = []; beq = ...

23 Tage vor | 1

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Beantwortet

BVP Error, help with explaination

The solver is no longer able to capture the steep gradient of your solution at x=0. Look at sol.x in the last step of the cont...

BVP Error, help with explaination

The solver is no longer able to capture the steep gradient of your solution at x=0. Look at sol.x in the last step of the cont...

23 Tage vor | 0

Beantwortet

Data type symfun (code problem)

If your MATLAB release throws an error (R2024a does not as you can see above), try [n(x) d(x)] = numden(df(x)) instead of [n ...

Data type symfun (code problem)

If your MATLAB release throws an error (R2024a does not as you can see above), try [n(x) d(x)] = numden(df(x)) instead of [n ...

24 Tage vor | 1

Beantwortet

The estimation error is strangely obtained from Simpson's 1/3 rule...

syms a b c d e real syms t real f(t) = a*t^5 + b*t^4 + c*t^3 + d*t^2 + e*t; s = 0; i = -1/2; while i < 959.5 i = i + ...

The estimation error is strangely obtained from Simpson's 1/3 rule...

syms a b c d e real syms t real f(t) = a*t^5 + b*t^4 + c*t^3 + d*t^2 + e*t; s = 0; i = -1/2; while i < 959.5 i = i + ...

24 Tage vor | 1

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Beantwortet

V2H Optimization: No feasible solution found

Use energyStorage = optimconstr(T); energyStorage(1) = BSS_SOC(1) == 0; energyStorage(2:T) = BSS_SOC(2:T) == BSS_SOC(1:T-1) -...

V2H Optimization: No feasible solution found

Use energyStorage = optimconstr(T); energyStorage(1) = BSS_SOC(1) == 0; energyStorage(2:T) = BSS_SOC(2:T) == BSS_SOC(1:T-1) -...

25 Tage vor | 1

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Beantwortet

Need to solve the following equation with three knowns and 2 unknowns.

H_BM = rand(100,1); g_mean = rand(100,1); Wi = rand(100,1); Hi = H_BM; gi = g_mean; x = Hi.*gi; y = Wi + Hi.*gi; fitl...

Need to solve the following equation with three knowns and 2 unknowns.

H_BM = rand(100,1); g_mean = rand(100,1); Wi = rand(100,1); Hi = H_BM; gi = g_mean; x = Hi.*gi; y = Wi + Hi.*gi; fitl...

25 Tage vor | 1

Beantwortet

Why does Matlab not recognize fieldnames function?

You overwrite the "fieldnames" function by setting it to a variable value: fieldnames = fieldnames(results.digitalMap);

Why does Matlab not recognize fieldnames function?

You overwrite the "fieldnames" function by setting it to a variable value: fieldnames = fieldnames(results.digitalMap);

27 Tage vor | 0

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Beantwortet

Simulate Fick's 1st and 2nd laws of mass diffusion.

The correct update for inner grid points is C_new(i,j) = C_old(i,j) + dt * (D_x*(C_old(i-1,j)-2*C_old(i,j)+C_old(i+1,j))/dx^2 +...

Simulate Fick's 1st and 2nd laws of mass diffusion.

The correct update for inner grid points is C_new(i,j) = C_old(i,j) + dt * (D_x*(C_old(i-1,j)-2*C_old(i,j)+C_old(i+1,j))/dx^2 +...

27 Tage vor | 0

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Beantwortet

Indices shown in plot are off

My guess is that the x-axis has a resolution of 10.

Indices shown in plot are off

My guess is that the x-axis has a resolution of 10.

29 Tage vor | 0

Beantwortet

issue in calculation of wave speed

The below code will at least give you the correct update of the solution. You don't initialize "half_max_positions" ; that's wh...

issue in calculation of wave speed

The below code will at least give you the correct update of the solution. You don't initialize "half_max_positions" ; that's wh...

29 Tage vor | 0

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Minimize difference between two data sets

Use [output] = [method](@(AB) my_func(AB(1),AB(2)), [A B]) instead of [output] = [method](@(A,B) my_func(A,B), [A B])

Minimize difference between two data sets

Use [output] = [method](@(AB) my_func(AB(1),AB(2)), [A B]) instead of [output] = [method](@(A,B) my_func(A,B), [A B])

29 Tage vor | 0

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