Answered
Monte Carlo integration of sin(x)
This is what you are currently doing with the "random counting in an area" method: To make it go from -1 to +1 instead, you c...

6 years ago | 1

Answered
How can i split the values of vector into group of 5?
Assuming your vector is divisible by 5, you could do this: v = your vector g = reshape(v,5,[]); % reshape v into a 5 x N matri...

6 years ago | 1

Answered
Runge-Kutta function with a second order ODE
I'm still confused about your initial conditions and what y0 and y1 are. But let's back up a bit. For a 2nd order ODE, your st...

6 years ago | 0

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Answered
how to call struct array in subroutine
See this related thread: https://www.mathworks.com/matlabcentral/answers/480829-what-is-the-best-way-to-insure-that-all-of-my-f...

6 years ago | 0

Answered
For and if loops
RT([3,6],v) is the syntax to use for the 3rd and 6th rows of the v'th column of RT. But this is of course going to be two eleme...

6 years ago | 0

Answered
Matlab Solving Differential Equation using Runge Kutta
In this line: k_1 = F_xy(x(i), xy(i)); You've got xy(i) as an argument, but there is no xy variable. I think you meant y(i) h...

6 years ago | 0

Answered
How can i write MacLaurin Sequence for 1/1+x2
An outline of your code could look something like this: x = _____; % you fill in the blank here, or get an input from the user ...

6 years ago | 0

Answered
Multiplication of complex matrices
There are two different operators: ' is the complex conjugate transpose .' is the straight transpose (no complex conjugate), n...

6 years ago | 2

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Answered
why MATLAB 2019b MEX file is slower
Impossible to say for sure without knowing what your mex function is doing. One thing to note is that in R2018a the storage for...

6 years ago | 3

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Answered
Different complex log values displayed for a "single" input
This is simply the result of floating point calculation artifacts ... not a bug. For instance, your assertion that all of your ...

6 years ago | 0

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Answered
using ode45 for coupled equations
You are mixing syntax here: @(t,x)myfun Either use the syntax @(t,x)expression, where expression is the derivative or use the...

6 years ago | 0

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Answered
For several values of x, use MATLAB to confirm that sinh x = (ex − e−x)/2.
Note that sinh x and ex and e-x in your title would be sinh(x) and exp(x) and exp(-x) in MATLAB code.

6 years ago | 0

Answered
How can I plot sin(x),sin(2x),...,sin(nx) for an input n all on the same graph? Matrix dimensions must agree error
Modifying your original code without a loop: x=[-2*pi:pi/64:2*pi]; i = input('Enter a positive whole number: \n'); z=[1:i]'; ...

6 years ago | 1

Answered
Dice rolling & loops
The loop could look something like this: n = numel(a); got5or6 = 0; for k=1:n if( _______ ) % you fill in the blank here...

6 years ago | 0

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Answered
Matlab code for Euler method help
z(i+1) = z(i) + f*h; T(i+1) = T(i) + h; plot(T,z);

6 years ago | 0

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how to plot euler forward method
Don't change the iteration variable withing the loop. Remove these lines from your code: n=1:11;

6 years ago | 0

Answered
Creating a loop for game
The name "input" is an existing MATLAB function. It would be best to change this to something else, e.g. n. And use a differen...

6 years ago | 0

Answered
# of elements mismatch
I'm guessing that the 97th element is empty. What does this show: tl{97}

6 years ago | 1

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Answered
How to Convert Euler Angles (Z-X-Z Convention) to Axis Angles for Image Stack Rotation
An Euler Angle conversion routine by John Fuller that handles all possible conventions can be found here: https://www.mathworks...

6 years ago | 0

Answered
How to get field value from a struct as a variable in order to use in a code?
Depends on your downstream code whether this is really worth it, but simply e.g. x = yourstruct.x; y = yourstruct.y;

6 years ago | 1

Answered
Attempting to have a series for sin stop summing when the precision is correct
Inside the sinser function, you never set p to a vector ... it is always just a scalar. If you want to return all of those inte...

6 years ago | 0

Answered
generate unit vectors based on matrix size
Why not just V(1,2) = 1; Or if you really need to explicitly set those 0’s then start with V(:,2) = 0; followed by the above...

6 years ago | 0

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Answered
mod gives incorrect result
See this thread: https://www.mathworks.com/matlabcentral/answers/338182-how-to-get-mod-of-large-numbers

6 years ago | 1

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Answered
eulers improved method code error
s2=F(x+h/2,y+h*s1/2); %% is it correct for modified euler If "Improved" Euler's Method means "Modified" Euler's Method as your ...

6 years ago | 1

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Answered
Unable to perform assignment because the indices on the left side are not compatible with the size of the right side. What does this mean?
Look at this line: Segment(n_start)=data(n_start:(n_start+ window_size-1)); and simply plug in the numbers for the first itera...

6 years ago | 1

Answered
Getting an error with the ODE45 function.
You've got your calling code mixed in with your derivative code. You need to code this differently. E.g., one way: In a file c...

6 years ago | 0

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Answered
Runge Kutta method computational cost
Side Note, You should not be calculating f(x(k),t(k)) twice in your 2nd order method. You should be doing it like your 4th orde...

6 years ago | 1

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Mex -largeArrayDims in Linux
You didn't give it the LAPACK library to link to, so there is no dgesv_ function, hence the error. You need to take this: lapac...

6 years ago | 0

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Answered
Can MEX BLAS library be used for native double matrix in C?
Two problems: 2D matrices are stored column-wise by MATLAB and is assumed by the BLAS and LAPACK routines also. So this: ...

6 years ago | 1

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Answered
How to save ode45 outputs in a loop?
Don't use a loop. Just call ode45 once and it will give you the entire results in T and Y. [T,Y] = ode45(dydt, t, [y0, dy0]); ...

6 years ago | 0