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Sam Chak


Last seen: Today Active since 2020

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Answered
custom equation fit - function value and YDATA sizes are not equal
Hi Birsen I think there should be dots here: F = @(x,xdata) (x(1) + (x(2)./(xdata.^2))).*exp(- xdata/x(3));

1 hour ago | 0

Answered
Difference between matlab ss function and Simulink State-Space block
Hi @Raymond Wong I have added one line after sys = ss(A,B,C,D,Ts) to determine whether system is stable or not. isstable(sys) ...

16 hours ago | 0

Answered
I am tyring to implement a code with a loop. But my output variable is a NaN, but it must be a number in output. I am not sure what's wrong. Can anyone help?
@ravi poudel Please check your code if singularity occurs in this line: dydx = (1/2)*ellipse(2)*(1-(x/ellipse(1)^2)^(-0.5))*(-...

22 hours ago | 0

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Answered
Sigmoid function shaping and fitting by curve-fitting toolbox
Hi @Batuhan Edit 2: Since the shape of the Black curve is preferred, Gompertz function is proposed for the fitting. Click on t...

1 day ago | 1

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How can i solve and input this problem
Hi @Nathaniel I use a different example, so that you can try to work on the solution yourself. fun = @(x) exp(x) - (6*x.^2 -...

1 day ago | 0

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How to findout this equations value
Hi @Sourasis Chattopadhyay You can try using the solve() command. R12 = 48.6173; % solving Eqn 1 and Eqn 2 simultaneously R2...

1 day ago | 0

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How do I perform a segmented regression for linear and exponential piecewise curve
Hi @Luqman There are 3 segments defined over certain intervals of : a constant a straight line and an exponential decay ...

2 days ago | 0

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Need help with "Out of memory" error
5 millions of rows... Even Excel cannot handle more than 1,048,576 rows. What is the size of your data array? N = 5e6; n = ro...

2 days ago | 0

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Approximating fractional order system to higher order integer order transfer function
Hi @Amarnath K The FOMCON toolbox by @Aleksei Tepljakov is pretty popular for dealing with fractional-order systems. Also chec...

3 days ago | 0

Answered
FRF (frequency response function) quarter car
Hi @Federico Paolucci Perhaps you can use this tfestimate() command to estimate the transfer function of quarter car. Examples ...

3 days ago | 0

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Given the set X and Y of a circle/ellipse how would you calculate the diameter?
hi @Glypton One way is to fit the data (x, y) using the circle equation model. From the fitted model, you will know the radius...

3 days ago | 0

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Answered
Fit a spline function to a set of data points
Hi @Deepa Maheshvare Thought you want the 'spline'? Is there a reason to use the 'linear' method? x = [0, 4, 6, 10, 15, 20];...

3 days ago | 0

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Answered
How to represent a curve with straight line segments?
Hi @Luis Eduardo Pacheco González Just wondering if you want to display a smooth sinusoidal curve like this? Or, if you are as...

4 days ago | 1

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Answered
How do I plot this piecewise function?
Hi @Zac Because you mispelled 'piecwise'? Anyhow, you can try using one of these methods: t = -3:1e-3:5; %% Method 1 x = ...

4 days ago | 2

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Answered
MPC toolbox: implementation of default cost function
Hi @Renate There shoud be a file called mpc_costcomputation. Please check if this is what you are looking for. edit mpc_costco...

4 days ago | 0

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Answered
How to utilize dropout to an anfis in MatLab
Hi @Chengxiang Perhaps you can copy the source code from here edit anfis and then paste the anfis code to a new script, where...

4 days ago | 0

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Answered
Can anyone please help me in plot of detaec' and taln. In this Iam getting error Error: Invalid expression. When calling a function or indexing a variable, use parentheses. Ot
Hi @Nudrat Sufiyan From your parameters, ThisTerm returns a vector of very small values, because of your chosen value in p. If...

5 days ago | 0

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Answered
Build expert system in Matlab
Hi @Sarah Since you now have the idea how to create the rules, then you can build the Expert system.

5 days ago | 0

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ODE45: Solving a system of ODEs, except one of the equations changes based on certain parameters. How can I code this?
@Josh Ciesar Assuming that the right direction of the piston is defined by , then this graph shows exactly what you described. ...

6 days ago | 0

Answered
bode diagram of the quarter car
Hi @Federico Paolucci Say the car model is given by . Then you can use the bode() function. omega = 1; zeta = 0.125/8; s = ...

6 days ago | 0

Answered
square wave not "limited"
@Federico Paolucci Doesn't seem to have any issue. t = linspace(0, 3*pi, 3001)'; f = 2; duty = 50; x = 0.03*square...

6 days ago | 1

Answered
how to only plot a certain area of an existing plot
Hi @rman Generally, this imcrop() command is used to crop image, but it can only crop rectangular shape. To crop a circular sh...

7 days ago | 0

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How can I output the bode plot of a closed control circuit in simulink?
Hi @3a4 In Calculus, we learned Laplace Transform as a strategy for resolving linear differential equation. Applying Laplace ...

7 days ago | 0

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Answered
Math equation for MFCC bit rate
Hi @Jogger If you had begun your journey into the unknown, then perhaps MATLAB Reinforcement Learning Toolbox can help you with...

7 days ago | 0

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Please I am working on gait planning but I hwve to determine the position angles
@Eric Andoh Perhaps you can try fitting that using the Sum of Sines Model. https://www.mathworks.com/help/curvefit/sum-of-sine...

7 days ago | 0

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Answered
Recover the best individual of each population in GA
Yes, @Jaime Trivino, it is possible according to this section. state.Score % gives you the scores of the current population...

7 days ago | 0

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Answered
the error "The function values at the interval endpoints must differ in sign" + fzero
Hi @Mohamed Adam The function values between the endpoints in this interval x_int have the same sign. If they have different si...

7 days ago | 0

Answered
Simulink model of RLC circuit (2nd order differential equations)
Hi @Tech The first impression is that the singularity might be caused by the "Division by zero" issue. Looking at your differe...

8 days ago | 1

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Answered
How can i solve this cost function?
Hi @Volcano I converted the matrix equation into a scalar equation. Since there is no constraint, fminunc() is used and the loc...

8 days ago | 1

Answered
How can I solve this second order equation?
@Shada ahmed This is not exactly the equation given, but it should give you the idea of ''visualizing' the relationship between...

8 days ago | 0

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