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help with a vibratonal analysis code
m1=53;% Mass m2=62.096; k=3.096e+006 ; % Stiffness c=150; % Damping % 4 x 4 matrices disp('4 x 4 Mass matrix'); mt=[c,0,m1...

5 years ago | 0

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Not able to integrate a matrix.
You missed to define some values, for generality i setted them to be symbolic variables. Also integral is a function for numeric...

5 years ago | 0

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Error using bar (line 172) X must be same length as Y.
Transpose y: x = 1990; y = [10 20 30]'; bar(x,y)

5 years ago | 0

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Obtaining Information from Reinforcement Learning while Training
The reward of each training episode is stored in the trainsStats struct which is the output argument of the train function. Insi...

5 years ago | 2

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How to display Y, Cb and Cr components of an image?
I used the inbuild example file peppers_RGB_tiled.tif, which has no 4rd dimension that could be cleared, so i used a try catch b...

5 years ago | 0

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solve: Cannot find explicit solution but it have solutions, matlab's bug?
Congratulations, you have 1 solution of an infinite number of possible solutions - look to the borderline case of equal to: sym...

5 years ago | 0

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How to use fsolve when a nonlinear equation given two arrays of parameters (not the variables)? Why can't I use for loop?
Hi, you could try to vectorize your function in order to avoid for loops - here is a simple example: % Constant 1 as a row vec...

5 years ago | 0

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Question about GA and the fun.
Have a read here: https://de.mathworks.com/help/optim/ug/passing-extra-parameters.html In your case it should look somehow lik...

5 years ago | 2

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Help me I am unable to input array
They way you coded it needs to enter the single values one after each other: Enter elements of x=1 Enter elements of x=2 Ente...

5 years ago | 0

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Problems using LSTM with PPO Agent - Error: Invalid input argument type or size such as observation, reward, isdone or loggedSignals.
I finally could solve the issue. The problem was that there were 2 LSTM layers in the network, which led to the error: Caused b...

5 years ago | 1

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Question

Problems using LSTM with PPO Agent - Error: Invalid input argument type or size such as observation, reward, isdone or loggedSignals.
Hi, i implemented some RL agents (DQN, AC, PPO...) successfully with my custom environment function by using a feedforward netw...

5 years ago | 1 answer | 0

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Answered
numerically solving an equation involving a matlab function with multiple variables
fun = @(x) blsprice(5,2,0.05,x,0.2) - 4; unknown_time = fsolve(fun,0.5)

5 years ago | 1

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Answered
I want to get 2d image from a sensor data.What matlab commands convert a dataset to images?
A = rand(100,100) imshow(A) or A = (randi(1500,100,100))-750 image(A)

5 years ago | 0

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How can I name matrices generated by a for loop as Z1,Z2,Z3 ...etc.
There are a lot of contributions (one of the best is here) which show why this way of coding is bad - use an efficient way by in...

5 years ago | 1

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Answered
Problem with solve matrix
For me your code works: disp('An economic system composed of 3 sectors has the input-output matrix'); D=[0.5,0.1,0.1;0.2,0.5,0...

5 years ago | 0

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ode45 solver code for solving a system of three coupled equations does not work
Your ode appears to be stiff - therefore i recommend to use ode15s instead of ode45. Also the behaviour of your system can be se...

5 years ago | 1

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Answered
i want to read a csv file and store as rows and columns of a cell
fileID = fopen('FOM_HFA_Pavg.csv'); content = textscan(fileID, '%s','Delimiter','\t'); fclose(fileID); content = content{:}; ...

5 years ago | 0

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Answered
calculate and plot the following differential equation using ODE45solver.
y0=0.5; %intial value h=0.8; % t=[0 4]; %tspan [t,y] =ode45(@(t,y)-y+sin(t), t,y0); plot(t,y,'-o'); xlabel('time'); ylabel...

5 years ago | 0

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Answered
using Q learning agent for continuous observation space
You also are allowed to write a custom critic function: https://de.mathworks.com/help/reinforcement-learning/ref/rlqvaluerepres...

5 years ago | 0

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ODE Chemical Reaction Engineering with MATLAB
Your code works - you only need to call your function and plot the results: % Call the function and save results in W and Fa [...

5 years ago | 0

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Calculate a letter from equation with letters.
You might want to do this: syms Xe Ye a1 a2 cos1 cos2 sin1 sin2 eq(1) = Xe == a2*(cos1*cos2-sin1*sin2)+a1*cos1; eq(2) = Ye ==...

5 years ago | 0

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FZERO cannot continue because user-supplied function_handle ==> @(M)FindM(M,N(k),Q,wn(i)) failed with the error below.
Declare the code in findM_1P as a function and give it proper input and output arguments, to make it possible for fzero passing ...

5 years ago | 0

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IMRT Beam angle optimization
You might want to read the dissertation from Mark Bangert, which includes a rich bibliography: http://archiv.ub.uni-heidelberg....

5 years ago | 0

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Error in bin2dec ?
You are not doing wrong - just read the documentation: "...If the input argument D has a value greater than the value returned ...

5 years ago | 1

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Combining 3 curves into 1 average
Here is a simple example: % fantasy times times1 = 1:10 times2 = 1:2:11 % fantasy values y1 = 2 * (1:10) y2 = 4 * (1:2:1...

5 years ago | 0

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A problem while using lsqnonlin
Use the same random numbers for the same results: rng('default') d = linspace(0,3); y = exp(-1.3*d) + 0.05*randn(size(d)); ...

5 years ago | 0

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Not getting six coupled ODEs solution using bvp4c in MATLAB, Please help me
I used nested functions - for 2 of the constants you did not provide values: % Call the outer function finalprogramme %% Ou...

5 years ago | 0

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Answered
Environment Reinforcment learning Matlab
See this link to the documentation: https://de.mathworks.com/help/reinforcement-learning/ug/create-custom-reinforcement-learnin...

5 years ago | 0

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Custom Environment for Reinforcment learning
There is a step-by-step example in the documentaion: https://de.mathworks.com/help/reinforcement-learning/ug/create-custom-rein...

5 years ago | 0

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Please tell me how to use ode45 code
You need to perform a inverse laplace transformation: num=134; den=[1 16 134]; x=tf(num,den) subplot(1,2,1) step(x) title(...

5 years ago | 1