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Problem using 4th order Runge-Kutta method
You have a factor of 2*K4 that shouldn't be there. It should just be K4. E.g., Fx = @(t,x,vx,y,vy,z,vz) [vx; 3*t; vy; t; vz; 7*...

約1年前 | 0

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How can I find angle between two vectors in 3D ranging from 0 to 360 or -180 to +180?
https://www.mathworks.com/matlabcentral/answers/501449-angle-betwen-two-3d-vectors-in-the-range-0-360-degree

約1年前 | 0

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Add another column to the right end of this array
your_matrix(:,end+1) = 1.5;

約1年前 | 0

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Convert Number Character array to Number Integer array/matrix?
Numeric types typically do not get displayed with leading 0's. The numbers you show are converted correctly, they just don't pr...

約1年前 | 0

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Use strcpy with mxArrayToString ?
char* inputStr2 = strcpy(inputStr2, inputStr); % Not working and causing matlab to crash This line crashes because inputStr2 is...

約1年前 | 1

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How to find the number of non-NaN elements in a column that are NaN in the last column, in MatLab?
Code is written from a slightly reordered wording: "for each column, number of elements that are NaN in the last column and non...

約1年前 | 0

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How to call function repeatedly using arrays as variables?
There are other ways do to this, but to answer your question about how to turn the code into a loop, use indexing based on the n...

1年以上前 | 1

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Best Practice: Many Functions relying on Global Variables?
See this link for a related discussion involving the best way to define global constants, in particular Steven Lord's answer: h...

1年以上前 | 1

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Use Matlab to find the acceleration and jerk of the body with velocity
Take the derivative of velocity to get acceleration. Take the derivative of acceleration to get jerk. Since you have an explic...

1年以上前 | 0

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floating-point arithmetic
"... the IEEE754 conversion of 0.1234 and 0.123 have infinite digits ..." Not sure what you mean by this statement. Neither of ...

1年以上前 | 0

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random number generating RANDI with percentage
One way: n = 1000; p = 0.86; r = rand(n,1); x = r < p; m = sum(x); r(x) = randi([0,14],m,1); r(~x) = randi([15,28],n-m,1)...

1年以上前 | 0

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Points inside the sphere
Just plug your points into the ellipsoid equation and see if they work. E.g., ((x - X)/a).^2 + ((y - Y)/b).^2 + ((z - Z)/c).^2 ...

1年以上前 | 1

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Strange output from symbolic calculation
This isn't strange at all. You are asking the Symbolic Engine to examine all floating point expressions involving pi, which isn'...

1年以上前 | 0

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I keep getting an error?
Generally, these types of problems are solved by extracting the contents of the cell instead of using the cell itself. E.g., C ...

1年以上前 | 0

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3D sparse matrices
You can use the ndSparse FEX submission by Matt J: https://www.mathworks.com/matlabcentral/fileexchange/29832-n-dimensional-spa...

1年以上前 | 0

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Convert Fortran to MATLAB
Here is the equivalent MATLAB code: NB = 100; F = 0; for i=1:NB % [some equations] if( abs(xm) < wm ) ym ...

1年以上前 | 0

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What is the difference between a^3 and a.^3 if a is a matrix?
E = C^3 is a matrix power, equivalent to E = C*C*C, where these are all matrix multiplies. D = C.^3 is element-wise power, wher...

1年以上前 | 2

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Need Help for the rest of this coding
This is very basic vector construction and indexing. I suggest you take the MATLAB Onramp tutorials found here: https://www.mat...

1年以上前 | 0

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Malfunction to my matrix calculation
K .* F (with the dot) does element-wise multiplication with implicit array expansion if the variables are different sizes, thus ...

1年以上前 | 1

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How do I write this c++ for loop statement in Matlab for loop?
E.g., using a while loop (changed max and min to maxx and minn): x = j; while( maxx >= minn && x <= m+r ) % body of loop ...

1年以上前 | 0

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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?

1年以上前 | 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 ...

1年以上前 | 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...

1年以上前 | 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...

1年以上前 | 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...

1年以上前 | 1

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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...

1年以上前 | 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...

1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...

1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

1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...

1年以上前 | 0

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