Answered
Calculate total heat loss by conduction given temperature and depth profile vectors
Here is another way to determine the temporal change of heat content in the substratum. rho*cp*dT/dt = d/dx (k*dT/dx) Integrat...

2 years ago | 0

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Answered
Calculate total heat loss by conduction given temperature and depth profile vectors
How can I estimate the total heat loss (w/m2) at each time interval (i.e., the heat loss for every profile)? Total heat flow in...

2 years ago | 0

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data not generating and error in plotting
And what is the "correct" result ? According to your mathematical description, I get this: % Define initial parameters lambda...

2 years ago | 0

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Answered
Problem with the fitting
% Define the data dr_data = [2.5453, 0.042123; 5.0907, 0.075326; 7.636, 0.059506; 10.1813, 0.071553; 12.7267, 0.071365; 15.272,...

2 years ago | 0

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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...

2 years ago | 0

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Answered
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...

2 years ago | 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

2 years ago | 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...

2 years ago | 0

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Answered
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.

2 years ago | 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...

2 years ago | 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;...

2 years ago | 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...

2 years ago | 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:...

2 years ago | 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...

2 years ago | 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.

2 years ago | 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_{...

2 years ago | 1

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Answered
Plot between Nu vs Ra
Replace Ra_values = 10:100:100000; by Ra_values = (10:100:100000).';

2 years ago | 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...

2 years ago | 1

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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...

2 years ago | 0

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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...

2 years ago | 0

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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 ...

2 years ago | 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...

2 years ago | 0

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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...

2 years ago | 0

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Answered
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 = ...

2 years ago | 1

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Answered
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...

2 years ago | 0

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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 ...

2 years ago | 1

Answered
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 + ...

2 years ago | 2

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Answered
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) -...

2 years ago | 1

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Answered
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...

2 years ago | 1

Answered
Why does Matlab not recognize fieldnames function?
You overwrite the "fieldnames" function by setting it to a variable value: fieldnames = fieldnames(results.digitalMap);

2 years ago | 0

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