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why my matlab code calculates the inequality wrongly?
Negative numbers are not greater than positive numbers. This is the correct result. What is strange to you about this?

fast 4 Jahre vor | 0

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RK4 Method for Windkessel error
Multiple errors. When you call your function handle f, it is assumed that the P and Q are values passed at time t. They are not ...

fast 4 Jahre vor | 1

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Use a for loop to determine the sum of the first ten even terms in the series 5k3 (k=2, 4, 6, ….)
You are summing all the terms with 2:10. For the "even" terms you need to skip the odd ones, so the range would be 2:2:something...

fast 4 Jahre vor | 0

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Polt an object in uniform circular motion with Euler method
So you have made a good start, but you have errors in your derivatives ... why do you have t's in your derivative equations? The...

fast 4 Jahre vor | 0

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How to solve a non-linear system of differential equations?
Your equations are linear in the derivatives, so you can form your equations as a matrix equation, then write a derivative funct...

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What do I need to change to get my Improved Euler's to match my Euler's?
Your current code is hard to read and debug because you have multiple variations of this expression scattered throughout your co...

fast 4 Jahre vor | 0

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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...

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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...

fast 4 Jahre vor | 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

fast 4 Jahre vor | 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...

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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...

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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...

fast 4 Jahre vor | 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 ...

fast 4 Jahre vor | 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

fast 4 Jahre vor | 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...

fast 4 Jahre vor | 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...

fast 4 Jahre vor | 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...

fast 4 Jahre vor | 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...

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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...

fast 4 Jahre vor | 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...

fast 4 Jahre vor | 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...

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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. ...

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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...

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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 ...

fast 4 Jahre vor | 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 ...

fast 4 Jahre vor | 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...

fast 4 Jahre vor | 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 ...

fast 4 Jahre vor | 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...

fast 4 Jahre vor | 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.

fast 4 Jahre vor | 0