Community Profile

# jgg

104 total contributions since 2015

View details...

Contributions in
View by

How to convert a string to a variable useable in a script?
I think you're like 99% of the way there. Z11='haar_net_scg_in1_2obsrv'; yfit11 = eval(strcat(Z11,'(Ind_vald)'); Thi...

bijna 4 jaar ago | 0

| accepted

How to optimize this program using a for loop?
As far as I can tell, you're just doing this: fm1 = ifft(fft(fx)/norm(fx).*y); figure(1) plot(abs(fm1)) fm2 = if...

bijna 4 jaar ago | 0

| accepted

How to set linspace to infinity
No, this isn't possible because <http://www.mathworks.com/help/matlab/ref/linspace.html linspace> generates a uniformly spaced v...

ongeveer 4 jaar ago | 0

| accepted

Question

Creating a block matrix of matrices?
I have a problem where I'm trying to create a matrix of the form [A B 0 0; 0 A B 0; 0 0 A B; 0 0 0 A]; However, this is i...

ongeveer 4 jaar ago | 2 answers | 0

### 2

Too many input arguments error. Matrix variable as input to objective function. Using ga algorithm.
As you've written it, your objective function does not take in any inputs. It needs to take in the point to be evaluated and ret...

ongeveer 4 jaar ago | 0

| accepted

How do you store all return values from a while loop in a vector in matlab ?
You can just store it as a vector: vector_choice_breakfast = cell(1000,1); count = 1; while breakfast_choicerep == 'Y' ...

ongeveer 4 jaar ago | 0

problem with matlab when trying to use a condition
You've opened a scoped environment. In order to end the scope, you need to use |end|: if i == 1 % do stuff end If y...

ongeveer 4 jaar ago | 0

Why is My Code Running So Slowly?
Try using the profiler, as per isakson recommends. This will give you an idea of what is taking up your time. MATLAB will use ...

ongeveer 4 jaar ago | 0

| accepted

OLS regression for bootstrapped data
To answer your question based on my comment. The command |Y = A(:,i)| selects the |i|-th column from the |A| matrix, so this wi...

ongeveer 4 jaar ago | 0

| accepted

How do I compare between 10 groups on a Ttest2?
Let's suppose you have them labeled |v1|, |v2|, ..., |v10| and they're the same size |n|. (If they're not the same size, use a ...

ongeveer 4 jaar ago | 0

How to integrate SS y*exp(x) dxdy using matlab?
I think this should work; you want the |integral2| function. fun = @(x,y)(x.*exp(y)); ymin = @(x)(x/4); ymax = @(x)(...

ongeveer 4 jaar ago | 0

| accepted

How to output multiple results via function
Do you mean from the function |fun|? It's pretty easy: function [f,yl,otherstuff] =fun(y,lambda) [y,fval]=fmincon(@...

ongeveer 4 jaar ago | 0

| accepted

Define a text string and use in variable name throughout script
You can do this using the eval command, but you should AVOID it if possible. If there's any way to change the way those matrice...

ongeveer 4 jaar ago | 0

Using table in MATLAB 2012
Matlab 2012 doesn't support the |table| function; it was implemented in R2013b. If you want to use that function, you will ne...

ongeveer 4 jaar ago | 0

questions related with tic and toc ?
1) They're the sounds a mechanical clock makes. Tick, tock, tick, tock as the pendulum swings back and forth. 2) The value o...

ongeveer 4 jaar ago | 0

| accepted

Parpool time to launch excessive
I'm going to answer this question for myself, approximately. It seems the issue was not specific to the MATLAB2014b compiler;...

ongeveer 4 jaar ago | 1

| accepted

How do i improve this loop?
Your approach should work. Try this instead: Image3 = randn(10,10,3)+355; %example data mask = Image3(:,:,1) > 350 & Imag...

ongeveer 4 jaar ago | 0

function handle producing different output
Not sure what the deal is, but this works: A_vals = A(0.1:0.01:1); vals = 0.1:0.01:1; B_vals = B(0.1:0.01:1); plot(val...

meer dan 4 jaar ago | 0

How to Solve a System of Equations with Multiple Variables
You can do this using numerical optimization by setting up an equation in which the objective function is the norm of the equati...

meer dan 4 jaar ago | 0

Question

Parpool time to launch excessive
Hello everyone I'm working with a large server which is running a large computation. I've been trying to speed this up using...

meer dan 4 jaar ago | 3 answers | 0

### 3

I need to make a set of 2000 random numbers between 0 and 1, with a mean of 0.5, with most of the numbers being either high or low (bimodal distrubution with peaks at 0 and 1)
m = randi([0,1],2000,1); r = abs(randn(2000,1)); r = r - min(r); r = r./max(r); num = m; num(m==0) = 0 + r(m==0); n...

meer dan 4 jaar ago | 0

How GlobalSearch optimization method works?
Basically, GlobalSearch takes a problem you've defined, which consists of an objective function and a solver, then repeatedly ru...

meer dan 4 jaar ago | 0

| accepted

meer dan 4 jaar ago | 0

| accepted

What does command 'rng default;' do?
When Matlab generates random numbers, they're not truly random; they are based on a pseudo-random number generating algorithm. ...

meer dan 4 jaar ago | 6

Undefined function or variable 'S', help!
You never define |S| in your function. You probably want something like this: function euler(func,S0,dt,t0,tf) % Time inte...

meer dan 4 jaar ago | 0

How to remove some certain rows in Matlab?
Ah, I think I understand: the first column are IDs or something. This should work, using the |ismember| function with the |rows...

meer dan 4 jaar ago | 0

How to (1) accept user input while (2) keeping track of the number of character keys being pressed?
I think you can do it by making a customized version of |GetEchoString|. I don't have the toolbox, but the code looks simple <h...

meer dan 4 jaar ago | 2

| accepted

Random multiply by negative one
Try this: A = [1,-1]; rand_nums = A(randi([1,2],22528,1000));

meer dan 4 jaar ago | 0