photo

David H


UCL

Last seen: alrededor de 4 años hace |  Con actividad desde 2014

Followers: 0   Following: 0

Mensaje

Estadística

All
  • First Review
  • First Submission
  • Thankful Level 3
  • Knowledgeable Level 1
  • First Answer

Ver insignias

Feeds

Ver por

Respondida
can anyone help me implement this?
Check out the documentation of "ode45", this should give you some idea of where to start. This uses the Range Kutta shooting me...

más de 4 años hace | 1

Respondida
Having trouble making a for loop equation
It isn't obvious what you are trying to do, you have a 3D function and want to fit an order 8 polynomial to it in z only? In ...

más de 4 años hace | 0

Pregunta


Simulating lens tilt on image
I am currently trying to simulate the effect of lens tilt on a flat image (i.e., one that does not contain multiple depths of fi...

más de 4 años hace | 2 respuestas | 0

2

respuestas

Pregunta


Close all figures which are not docked
Is there any easy way to close all figures which are not docked? Either a high level command or a way to loop over figures and ...

alrededor de 5 años hace | 2 respuestas | 0

2

respuestas

Respondida
I have a function that gives two outputs, what is the easiest way to use fzero on only the second output
No good way of doing this within Fzero, people have made that clear.

alrededor de 5 años hace | 0

| aceptada

Respondida
Using function syntax with stand alone executables
Having looked through all the answers to do with this, it appears it is just truly awful. I'm tempted to make a wrapper of the ...

casi 6 años hace | 0

Pregunta


Using function syntax with stand alone executables
If I generate a stand alone executable, lets call it myfun.exe, can I call this using the function rather than command syntax? ...

casi 6 años hace | 1 respuesta | 0

1

respuesta

Pregunta


I have a function that gives two outputs, what is the easiest way to use fzero on only the second output
I have a function [a,b] = fun(x) when I don't want to change the function. I want to find the value of x for which b returns ze...

casi 7 años hace | 2 respuestas | 0

2

respuestas

Pregunta


mtimesx crashes when used
After compiling the user submitted function mtimesx <http://www.mathworks.com/matlabcentral/fileexchange/25977-mtimesx-fast-matr...

más de 7 años hace | 1 respuesta | 0

1

respuesta

Respondida
i keep getting this Attempted to access y(1.5); index must be a positive integer or logical. when trying to implement a numerical hybrid scheme involving y(i+1/2) . here's the code so far: the problem is in line36
You can't call an index of an array with non-positive integer arguments. There is no 3/2 th entry of a matrix or vector, that d...

más de 8 años hace | 0

| aceptada

Respondida
How to solve "Error using ' Transpose on ND array is not defined. Use PERMUTE instead." ?
My guess is that your variable "img" has more than 2 dimensions. Identify which 2 dimensions of "img = imread(str);" are the on...

más de 8 años hace | 0

Pregunta


Controlling output of ode solvers
I am currently running an ODE solver in the form dy = @(t,y) M*y; [tout,y_out] = ode45(dy, trange,yinit); % y_out is...

más de 8 años hace | 0 respuestas | 0

0

respuestas

Pregunta


Limiting "y" output of ODE solvers
I am currently running an ODE solver in the form dy = @(t,y) M*y; [tout,y_out] = ode45(dy, trange,yinit); ...

más de 8 años hace | 1 respuesta | 0

1

respuesta

Pregunta


Strange colorbar ticks, not standard form
I am finding the behaviour of matlab odd when I am making contourf plots. The data I have is low amplitude so typically the dat...

más de 9 años hace | 0 respuestas | 0

0

respuestas

Respondida
"XXX" requires more input arguments to run
All these answers are basically "give the function default parameters" which is not always a desirable solution. If I accidentl...

más de 9 años hace | 1

Respondida
for about three days I have had this error message: Cell contents reference from a non-cell array object.
The problem is likely that one of X or y is not defined as a cell array. Can you put two lines of code before the error which...

más de 9 años hace | 0

Pregunta


1D Convolution over a slice within 2D data
If I have a matrix R which tabulates some function "R(x,y)" and I wish to calculate I(x,y) = int_{-inf}^{inf} dz P(z) R(x+z...

más de 9 años hace | 0 respuestas | 0

0

respuestas

Respondida
Solving N linear equations for N unknowns using arrays? Is this even possible?
As you have written it, it seems that sigma_a_InstrumentOneWest=sigma_a_InstrumentOneEast and the same for the instrument ...

más de 9 años hace | 0

Pregunta


Changing function logic parameters depending on outputs
If I have a function with 3 output arguments [a,b,c] = fun(x) I want the function only to calculate a,b,c if I actually c...

casi 10 años hace | 1 respuesta | 0

1

respuesta

Pregunta


Matlab UI crashes on startup in windows
When I start matlab on windows and don't enter any commands for a minute or so the cursor changes to a resize arrow and the UI n...

casi 10 años hace | 0 respuestas | 0

0

respuestas

Pregunta


What does permute actually produce?
Trying some calculations earlier, I have realised permute does not do what I thought it did. To clarify I did this % c...

alrededor de 10 años hace | 1 respuesta | 0

1

respuesta

Pregunta


Dynamic scaling of ODEs
When dealing with (linear) ODEs which have a solutions that decay/grow approximately exponentially is there anyway to get the in...

alrededor de 10 años hace | 0 respuestas | 0

0

respuestas

Pregunta


updating function list in a script.
As part of some code I am writing I am printing out symbolic variables into a .m file (so that they can be called with d.p. argu...

más de 10 años hace | 1 respuesta | 1

1

respuesta

Pregunta


simplifying symbolic expressions with factors of pi
If I have some symbolic expression say FF = besselj(1/2,x) FF = (2^(1/2)*sin(x))/(pi^(1/2)*x^(1/2)) I wish to cancel th...

más de 10 años hace | 1 respuesta | 0

1

respuesta

Pregunta


Factorizing an expression into a function of one parameter symbolic toolbox
Say I have some general symbolic expression which is a function of many symbolic variables a,b,c,d,e,f... etc. e.g. FF = cos(a)...

más de 10 años hace | 0 respuestas | 0

0

respuestas

Enviada


Express_as_exponential_series
Converts a symbolic expression S to the form S = sum_{k=1}^N c_k exp(b_k*t)

más de 10 años hace | 1 descarga |

Pregunta


Symbolic expansions, is it possible to express a solution as a series of exponentials
Lets say I have something like f_t = (A*cos(a*t) + B*sin(b*t))*(C*cos(c*t) + D*sin(c*t)), what I would like is something...

más de 10 años hace | 1 respuesta | 0

1

respuesta

Pregunta


Simplifying numbers in symbolic function
Upon substituting into a symbolic expression I get very long analytic expressions for numbers, e.g. (2^(1/2)*(3^(1/2)*pi*(5^(...

más de 10 años hace | 1 respuesta | 0

1

respuesta