# Romio

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**Content Feed**

Question

How to implement this coupled ODE

I want to solve this ODE but I don't know how to implement it. Basically I want du/dt to be some input function that I determine...

2 months ago | 2 answers | 0

### 2

answersQuestion

How to store intermediate values of solution in ode45

I have the following ode dm/dt model. I want to extract intermediate values of t, m (the solution),u at specfic intermediate poi...

2 months ago | 1 answer | 0

### 1

answerQuestion

ODE solver for restricted 3 body problem

I am trying to implement the following problem(restricted 3 body problem), but I don't know if my implementation is correct sinc...

5 months ago | 2 answers | 0

### 2

answersQuestion

block diagonal matrix in the opposite diagonal

Is there any function/way to construct a matrix with block matrcies in the opposite diagonal. I know of blkdiag( ) but it gives ...

5 months ago | 1 answer | 0

### 1

answerQuestion

ode15s solver produces wrong solution

I am trying to solve the heat equation such that using the method of line. I discritzed in space and used ode15s to integ...

6 months ago | 1 answer | 0

### 1

answerQuestion

How to automate the matrix-vector multiplication using the index of a vector?

I have the following m = 50; a = 5 b = 2 c = 2 J = @(t,y) [diag(a*ones(1,m)) + diag(b*ones(1,m-1),1) + diag(c*ones(1,m-1),-...

6 months ago | 1 answer | 0

### 1

answerQuestion

What can be done if fsolve cannot find solution?

Hello I have a large piece of code where I have a loop. In each iteration of the loop I use fsolve to find the solution of rela...

7 months ago | 1 answer | 0

### 1

answerQuestion

Implementing implicit method for system of ODEs

I am trying to implement implicit Runge Kutta for solving a system of ODEs. Currently I was able to do it for scalar ODE (y'=-y)...

8 months ago | 1 answer | 0

### 1

answerQuestion

How to create a loop on function handle

I want to write the following in an efficent way using a loop over j = 1:n. A is n by n matrix, t(i) is a scalar (where i is ano...

8 months ago | 1 answer | 0

### 1

answerQuestion

How to create a matrix with special block diagonal structure

I would like to create a matrix that has the following structure ( The blue dots are ones and the rest is zeros) the number ...

9 months ago | 4 answers | 0

### 4

answersQuestion

Change initial step length in fmincon

I am using fmincon to solve an optmization problem with the 'sqp' algorithm. I have set the variable 'StepTolerance' in options ...

9 months ago | 1 answer | 0

### 1

answerQuestion

Structured trianglar finite element mesh

The available trianglar mesh in the PDE tool box here gives an unstructured trianglar mesh like this one How can get a stucture...

10 months ago | 0 answers | 0

### 0

answersQuestion

optimizing two variables in fmincon with different sizes

I have a nonlinear optimization problem where I want to optimize an n x n matrix A and an n x 1 vector b. How can I set up the p...

11 months ago | 1 answer | 0

### 1

answerQuestion

how to import a saved figure into a subplot

Hi If I am saving multiple figures as say f1.fig, f2.fig and so on with specific settings that are already saved. How can I imp...

1 year ago | 1 answer | 0

### 1

answerQuestion

How to connect multiple points in order using the shortest line

I have the following discrete points. The x and y coordinates are the following X = [-0.5305 -2.0960 -1.6192 -2.276...

2 years ago | 2 answers | 0

### 2

answersQuestion

Weird java text in command window

Something weird happens to Matlab, I get this red text in the command window and it keeps changing whenver I move the mouse. Any...

2 years ago | 1 answer | 0

### 1

answerQuestion

Improving fit of custom function

Hello, I have the following curve. I want to fit it into a closed-form equation. I tried to use GRABIT to get a vector ...

2 years ago | 1 answer | 0

### 1

answerQuestion

adding the vectors at each cell in cell array

Hi I have a cell array where each cell contains a vector. I want to add up the vectors at each cell of each row. The cell arra...

2 years ago | 1 answer | 0

### 1

answerQuestion

How to extract one plot from multiple plots?

If I have subplot of 8 plots, How can I plot, say, the second plot on a seperate figure?

2 years ago | 1 answer | 0

### 1

answerQuestion

Error with installing MATLAB Support for MinGW-w64 C/C++ Compiler

Hi I am trying to run .c code on MATLAB. I did try using mex, but it gives me this error: Error using mex No supported compil...

3 years ago | 1 answer | 0

### 1

answerQuestion

How estimate the frequency of one feature of an image

Hi Is there any way to estimate the spatial frequncy of one feature in an image? Meaning, if I have the follwing image, can I o...

3 years ago | 0 answers | 0

### 0

answersQuestion

Why fft results of discrete Fourier series coefficients are different from the actual definition

I tried to find the fourier coefficients of this discrete time singal x[n] = [1 1 0 0 0] using fft to get the coeffiecits. Howe...

3 years ago | 1 answer | 0

### 1

answerQuestion

equally spaced array of complex numbers

How to create an equally spaced vector from -2i to 2i with increment of 0.01?

3 years ago | 1 answer | 0

### 1

answerQuestion

data fitting that output eigenvalues and eigenvectors of the data

Hello, I have the follwing data points constituting three curves. Is there any MATLAB function that perform regressio...

3 years ago | 1 answer | 0

### 1

answerQuestion

How to solve difference equation with variable coefficients

I know if we have a difference equation in the form of a_1(y[n]) - a_2 (y[n-1]) = b_1(x[n]), where a's and b's are constants w...

3 years ago | 0 answers | 0

### 0

answersQuestion

Error using plot: Value not a numeric scalar

I am using this running average function to smooth out dome noisey data. function y = RunningAvg(x,w) wts = ones(1, w) / w...

3 years ago | 1 answer | 0

### 1

answerQuestion

plot borders disappear when changing numbers to words in the axes

Hi I plotted some point data and changed the axis to words. But the right and up boarder of the plot disappeaed. Is there any w...

3 years ago | 0 answers | 0

### 0

answersQuestion

Edge distortion when resampling a signal

I have the follwing cosine signal that is sampled at rate fs = 32 Hz. f = 30; fs = 32; dt = 1/fs; t = -0.5:dt:0.5; c = cos(...

3 years ago | 1 answer | 0

### 1

answerQuestion

how to plot multiple decaying exponentials in one plot.

I would like to plot multiple decaying exponentials with different parameters (time, decay, peak). I was able to create this cod...

3 years ago | 1 answer | 0

### 1

answerQuestion

how to plot decaying exponential

Hello, I'd like to plot a decaying exponential function similar to this plot, while being able to vary the spike time and rat...

4 years ago | 1 answer | 0