Question

How can I make one of my parameters always greater than another one?

Hi all, So I have the code below, how could I change it if I always wanted beta to be larger than alpha0? Thanks in advan...

20 days ago | 1 answer | 0

Question

Why is ODE45 using so many intervals?

Hi all, I'm using the code below to solve an ODE. It's not problematic per se, but I'm just wondering if there is a way to fo...

28 days ago | 2 answers | 0

Question

How to iterate my algorithm?

So I have the code below, and I think I need to put another for-loop around it, but I'm not exactly sure how to get where I want...

1 month ago | 0 answers | 0

Question

Comparing every value in a numeric array to one value in another one

Hi all, Let's say I have a 10x1 numeric array and another one which is 82x3. What I'd like to do is create a new 10x1 matrix ...

1 month ago | 1 answer | 1

Question

How can I create a numeric array using entries from my 3D matrix?

If I have a 50x1x10 matrix, and I want to create a 10x1 numeric array, using the 50th entry from each of the 10 columns in the 3...

1 month ago | 1 answer | 0

Question

How to use my numeric array results as input values for an ODE?

So I have the following code: n = 10 ; result = zeros(n,5 ); for k=1:n ; A0=1;P0=29;g=rand;p=rand;B=rand ; result(k,:...

1 month ago | 1 answer | 0

Question

Result producing 1x5 array instead of 10x5?

Hi all, I have the following code which I'm expecting to produce a 10x5 array but it's only giving me a 1x5, and I'm not sure...

1 month ago | 2 answers | 0

Question

Accessing data from cells inside of cells

So I have the code below, which solves an ODE 1000 times with random variables at 10 different intervals (tspans). The result I ...

1 month ago | 1 answer | 0

Question

How to access/manipulate data from cell arrays?

So I have the code bleow which sovles an ODE 1000 times with random variables. The result is a 1000 by 1 cell array, the content...

1 month ago | 2 answers | 0

Question

How can I solve this ODE 1000 times with random variables?

So I have this code: tspan=[1 7];A0=rand;P0=rand;g=rand;p=rand;B=rand; [t,x] = ode45(@(t,x) [-g*x(1) + p*x(1); -x(1)*x(2)+ B...

2 months ago | 1 answer | 0

Question

Conditionally Defining a Variable using ODE45

How could I take this code I'm using and conditionally define my variable 'p'? For example, I want p=0 everywhere except when 3<...

5 months ago | 1 answer | 0

Question

How do I change the number of variables in a custom equation in the curve fitting tool?

So for example, on this page, we see a custom equation that only has variables x and y. But when I open the cftool, it defaults ...

7 months ago | 1 answer | 0

Question

How can I model conditionally defined exponential functions?

I am using the MatLab Curve Fitting Toolbox to model a conditionally defined exponential function. My function is that y = exp(g...

8 months ago | 1 answer | 0