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Concerned that matlabFunction( ), when converting from symbolic to numerical, changes the sizes of matrices and vectors,
Hi there! I am currently concerned that the function matlabFunction( ), when converting from symbolic to numerical, changes the...

26 días hace | 2 respuestas | 0

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Why does Matlab tell me that my ODE function returns a vector of length 12, while the length of my initial conditions vector is 6?
Hi there! I'm getting an error message from Matlab, telling me that my ODE model returns a vector of length 12, while the lengt...

27 días hace | 0 respuestas | 0

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'Matrix dimensions must agree' error, when using the backslash operator to solve Ax = b,
Hi there! I am getting a 'matrix dimensions must agree' error message when using the backslash operator \ to solve Ax = b. I we...

27 días hace | 1 respuesta | 0

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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...

alrededor de 1 mes hace | 1 respuesta | 0

1

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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 ...

alrededor de 2 meses hace | 1 respuesta | 0

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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...

2 meses hace | 2 respuestas | 0

2

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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...

2 meses hace | 2 respuestas | 0

2

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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...

2 meses hace | 1 respuesta | 0

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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 ...

3 meses hace | 1 respuesta | 0

1

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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...

3 meses hace | 1 respuesta | 0

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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...

3 meses hace | 1 respuesta | 0

1

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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 ...

alrededor de 1 año hace | 3 respuestas | 0

3

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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...

alrededor de 1 año hace | 1 respuesta | 0

1

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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...

más de 3 años hace | 1 respuesta | 0

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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...

casi 4 años hace | 1 respuesta | 0

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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...

alrededor de 4 años hace | 0 respuestas | 0