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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...

6 years 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...

6 years 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...

6 years 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...

6 years 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...

6 years 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' ...

6 years 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...

6 years 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 ...

6 years 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...

6 years 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 ...

6 years 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)(...

6 years 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(@...

6 years 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...

6 years 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...

6 years 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...

6 years 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;...

6 years 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...

6 years 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...

6 years 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...

6 years 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...

6 years 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...

6 years 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...

6 years ago | 0

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6 years 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. ...

6 years ago | 12

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...

6 years 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...

6 years 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...

6 years ago | 2

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

6 years ago | 0