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jgg

Active since 2015

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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...

plus de 5 ans ago | 0

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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...

plus de 5 ans ago | 0

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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...

plus de 5 ans ago | 0

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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...

plus de 5 ans ago | 2 answers | 0

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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...

plus de 5 ans ago | 0

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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' ...

plus de 5 ans 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...

plus de 5 ans 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 ...

plus de 5 ans ago | 0

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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...

plus de 5 ans ago | 0

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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 ...

plus de 5 ans 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)(...

plus de 5 ans ago | 0

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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(@...

plus de 5 ans ago | 0

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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...

plus de 5 ans 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...

plus de 5 ans 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...

plus de 5 ans ago | 0

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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;...

plus de 5 ans ago | 1

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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...

plus de 5 ans 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...

presque 6 ans 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...

presque 6 ans 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...

presque 6 ans ago | 3 answers | 0

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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...

presque 6 ans 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...

presque 6 ans ago | 0

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presque 6 ans ago | 0

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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. ...

presque 6 ans ago | 10

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...

presque 6 ans 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...

presque 6 ans 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...

presque 6 ans ago | 2

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

presque 6 ans ago | 0