Noob

Last seen: 3 dagen ago | Active since 2017

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Deciding when to call a Matlab function: Within my symbolic math code, or within my converted numerical code?
Hi there! I wrote a symbolic math code and used the algebraic solver solve( ) to get the equations that I want. I then converte...

3 dagen ago | 1 answer | 0

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answer

Question

Writing ODE equations for ode45 to solve;
Hi there! I have a basic question to ask here, regarding writing the first-order equations for ode45 to solve. Let's say I am ...

22 dagen ago | 1 answer | 0

1

answer

Question

ode45 integration issues for some choices of physical parameters,
Hi there! I have a simple, two-dimensional, ode model that solves for the trajectory of a flat plate falling through a fluid fl...

ongeveer een maand ago | 2 answers | 0

2

answers

Question

Simple question about creating an anonymous function,
Hi there! Using a Matlab function file, I wrote an ode model model(t, z, p), where p stores all of my physical parameters, suc...

ongeveer een maand ago | 2 answers | 0

2

answers

Question

How to animate background flow field that an object is moving through?
Hi there! I now have a decent code that solves an ode model of mine, using ode45. It is about a rigid plate falling freely thro...

ongeveer een maand ago | 1 answer | 0

1

answer

Question

How can I run code just once, for multiple intervals of numbers?
Let's say I want to calculate things for alpha ranging from 0 to 2pi. I've written if / else-if statements to do this: alpha ...

ongeveer 2 maanden ago | 1 answer | 0

1

answer

Question

How to loop through values?
Let’s say I have 11 values of beta, evenly-spaced with linspace( ). And let’s say for each value of beta, I want to compute some...

ongeveer 2 maanden ago | 1 answer | 0

1

answer

Question

Only the first if-statement block executes,
Hi there! I wrote an if-statement, followed by an if-else statement, followed by another if-else statement, followed by the end...

ongeveer 2 maanden ago | 1 answer | 0

1

answer

Question

Using an anonymous function handle as input into another function handle
Hi there! I have a question that's mostly about syntax: Let's say I write the anonymous function handle (for a program to give ...

ongeveer een jaar ago | 3 answers | 0

3

answers

Question

Writing a system of ODEs for ode45
Hi, I wrote a .m-file that has three second-order differential equations, broken down into six first-order equations. When I r...

ongeveer een jaar ago | 1 answer | 0

1

answer

Question

How to put fsolve in a loop, using 2 unknowns?
Hi, I want to write a code that asks fsolve to go through some combinations of guesses and then find all the roots (xdot, yd...

meer dan 3 jaar ago | 1 answer | 0

1

answer

Question

Filled figures, saved as eps or pdf, now have weird lines when zoomed in, while png files do not,
Hi, My filled figures, e.g. ellipses, using either the fill() or patch functions, and saved as eps or pdf files, now have weir...

meer dan 3 jaar ago | 1 answer | 0

1

answer

Question

Choosing more stringent values for RelTol and AbsTol in ode45, for smooth functions such as sin(t) or cos(t), does not change the numerical solutions,
Hi, I'm playing with the RelTol and AbsTol options for the ode45 solver, choosing more stringent values such as 1e-10 for bo...

ongeveer 4 jaar ago | 0 answers | 0