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How do i use fminsearch to find the minimum or maximum of a function . x.^4-3.*x.*y+2.*y.^2
You need to have your function handle accept a vector and return a scalar. I.e., the x argument to the function handle is a vect...

3年以上前 | 0

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Optimization of Rocket Launch
You have proposed work that IMO is way beyond what is achievable with your code. Constrained optimization of this sort is not tr...

3年以上前 | 0

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how to split a string (char value) with zero in front of it but showing the value in the matrix?
Two more ways: S = '0100'; S=='0' % logical result S-'0' % double result

3年以上前 | 0

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Manual MEX vs MEX by codegen
MATLAB does not publish the "rules" that Codegen uses to generate mex code. Because it is automated, I am not surprised that the...

3年以上前 | 0

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Solve 2nd order ODE using Euler Method
You start your loop with i=1, but that means your x_d(i-1) will be x_d(0), an invalid index, hence the error. You need to set in...

3年以上前 | 0

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Finding a single root of x^(3.6)=75
Make a function handle with the @ operator. E.g., fun = @(x) x^(3.6)-75; x0=3; z = fzero(fun,x0) Check z^3.6 Or you can r...

3年以上前 | 2

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Need to find dot product between two second order tensor
If you change the inner loop calculation to this: w(i,k) = dot(S(i,:),u(:,k)); then you would have dot products between the S ...

3年以上前 | 0

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linear combination of vector and permutation
Another way very similar to Torsten's method, limited to two desired values: n = 3; 2*(dec2bin(0:2^n-1)-'0')-1

3年以上前 | 0

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Use trapezoidal method to find the deflection at each measurement point.
Sounds like you want the cumtrapz( ) function. If the assignment requires you to use loops, just code up the formula found in th...

3年以上前 | 0

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How to convert decimals to Ascii characters?
Your table isn't ASCII encoding of characters, so you can't use simple functions such as double( ) etc. You are probably going t...

3年以上前 | 1

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Trapezoidal numerical integration using for loops
See the Trapezoidal Method section here for the fomula: https://www.mathworks.com/help/matlab/ref/trapz.html?searchHighlight=tr...

3年以上前 | 0

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a)Extract the data from the two columns into separate arrays named time and distance. b) Determine the velocity and acceleration of the rocket. Use a FOR loop or as many as d
Hints for using a difference method: Velocity = Position / Time Acceleration = Velocity / Time To get the delta values, just...

3年以上前 | 0

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Change of position of velocity vectors and time interval between the change
Looks like an orbit problem. Around the Earth, I presume? You will not be using the Symbolic Toolbox for this assignment. You w...

3年以上前 | 1

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Any comment to speed up the speed of caculation of symbolic loops having Legendre polynomials?
The Symbolic Toolbox is going to be slower than IEEE floating point ... that's just something you have to accept. And if you nee...

3年以上前 | 1

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Formula for norm(x)
This question appears to be a follow-up to this post: https://www.mathworks.com/matlabcentral/answers/1809695-what-exactly-norm...

3年以上前 | 0

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what exactly norm(x) function do?
The equivalent function to norm( ) for a complex column vector x is sqrt(x' * x) where x' is the complex conjugate transpose. ...

3年以上前 | 1

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Why am I receiving Not enough input arguments?
The error seems pretty clear, you are calling func( ) without enough input arguments. The func( ) signature has six inputs: fun...

3年以上前 | 1

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I have some coupled nonlinear ordinary differential equations. Three equations have three 2nd order derivative coupled together. Can someone tell me how I can get the response
Another related approach is to isolate all the 2nd derivatives on the LHS and put everything else on the RHS. Then pick off the ...

3年以上前 | 0

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how to use exp for this problem
You need to use the * operator to multiply in the denominator. E.g., w=exp(-(i-Un)^2/(2*sd^2)) If i is not a variable defined ...

3年以上前 | 0

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Multiple Outputs of a function into a single vector
You could modify f( ) to return a vector. Or if you didn't want to modify f( ) you could create a helper function that does this...

3年以上前 | 2

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dynamic matrix with changing variable name in for loop
Do not dynamically name variables. This is bad programming practice and will leave you with hard-to-use variables downstream in ...

3年以上前 | 0

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ODE solver for restricted 3 body problem
In this line: dydt(2) = y(1) + 2 * dydt(3) - mu_p * ((y(1) + mu)/D1) - mu * ((y(1) - mu)/D2); you use dydt(3) before you set i...

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Write a function file that computes the roots of a quadratic using the form for x+ and x−1 that are least susceptible to cancellation error.
Is this the type of formulae you are being asked to code? https://people.csail.mit.edu/bkph/articles/Quadratics.pdf https://st...

3年以上前 | 0

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How to get the same number of char as number of decimals using num2str?
You might look into using the fix( ) function to isolate the fractional part of your number and then work with that directly.

3年以上前 | 0

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matrix to struct do not match
You should really show us all of the actual code in question, not just a wordy description of the code. A better description and...

3年以上前 | 0

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Assign elements in multidimensional struct to 2D array
You can use the vercat( ) function to force the comma-separated-list generated by C.pts to stack vertically: for ii=1:5, C(ii)....

3年以上前 | 1

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Singular Value Decomposition calculation of a matrix
By changing the order of the rows you have changed the order of operations inside svd( ). The two answers are essentially the sa...

3年以上前 | 1

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Issue with N body problem using ode45
You need to rethink your problem statement and initial conditions. The initial positions can't possibly be in the neighborhood o...

3年以上前 | 0

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What is the best function of the following shape?
There are lots of functions that could fit this general shape. E.g., sin(x), or more generally A*sin(B*x+C) depending on width a...

3年以上前 | 1

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Rotate an image 180 degrees without library functions
Hint: Take a small example, rotate it 180 degrees, and see where the elements end up. Then consider how you might get that resul...

3年以上前 | 0