Alfonso Nieto-Castanon
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Simulating the Central Limit Theorem with Non Uniform Distribution in MATLAB
x = mean(rand(100,1000)); hist(x);
Simulating the Central Limit Theorem with Non Uniform Distribution in MATLAB
x = mean(rand(100,1000)); hist(x);
8년 초과 전 | 2
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SVD of symmetric complex matrix is giving an unexpected result.
Well, yes, they are "equal" up to a constant pure-phase term, which is always arbitrary in SVD (for any left and right singular ...
SVD of symmetric complex matrix is giving an unexpected result.
Well, yes, they are "equal" up to a constant pure-phase term, which is always arbitrary in SVD (for any left and right singular ...
8년 초과 전 | 1
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How do I make the chi2rnd(size) Matlab function faster for big matrices?
storing the chi2rnd(2048, 1000000) results require about 16Gb of memory, perhaps the extra time is due to memory-swapping rather...
How do I make the chi2rnd(size) Matlab function faster for big matrices?
storing the chi2rnd(2048, 1000000) results require about 16Gb of memory, perhaps the extra time is due to memory-swapping rather...
거의 9년 전 | 1
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Check if a graphics object is visible to the user
While it is simple to check which object is visible, e.g.: function ok = isvisible(handle) ok = true; while ok&&~isequal...
Check if a graphics object is visible to the user
While it is simple to check which object is visible, e.g.: function ok = isvisible(handle) ok = true; while ok&&~isequal...
거의 9년 전 | 1
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How to import Excel data from a spreadsheet with cross-file references?
I clearly would not recommend this as a first choice, but if nothing else works then perhaps you can simply have Matlab open, sa...
How to import Excel data from a spreadsheet with cross-file references?
I clearly would not recommend this as a first choice, but if nothing else works then perhaps you can simply have Matlab open, sa...
거의 9년 전 | 1
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how to average the close points ?
If you do not have "lines" of close points (the transitiveness issue that Walter mentioned), a simple and quick way to do this c...
how to average the close points ?
If you do not have "lines" of close points (the transitiveness issue that Walter mentioned), a simple and quick way to do this c...
거의 9년 전 | 0
질문
solving a matrix exponential equation
I know this is perhaps a "methods" question rather than a purely "Matlab" question, but does anybody know or could point me towa...
거의 9년 전 | 답변 수: 1 | 0
1
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Storing blocks of matrix data into a cell array
You may use <http://www.mathworks.com/help/matlab/ref/mat2cell.html mat2cell> for that. For example: rows = find(any(X,2)); ...
Storing blocks of matrix data into a cell array
You may use <http://www.mathworks.com/help/matlab/ref/mat2cell.html mat2cell> for that. For example: rows = find(any(X,2)); ...
거의 9년 전 | 1
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Generate arrow keys in MATLAB gui
The cdata approach is probably simpler. First check that variable rarrow_img contains the correct 3D matrix format (see th...
Generate arrow keys in MATLAB gui
The cdata approach is probably simpler. First check that variable rarrow_img contains the correct 3D matrix format (see th...
거의 9년 전 | 0
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how do I calculate t-value when I only know the mean of 10 and 95% confidence interval. I do not know sample size.
There are some subtleties depending on how your 95% confidence interval was computed, but typically: CI = tinv(.975,N-1)*s...
how do I calculate t-value when I only know the mean of 10 and 95% confidence interval. I do not know sample size.
There are some subtleties depending on how your 95% confidence interval was computed, but typically: CI = tinv(.975,N-1)*s...
거의 9년 전 | 0
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Reducing dimensionality of features with PCA
If you use: [coeff,score] = pca(M); Comp_PCA1 = score(:,1); where M is a (300 by n) matrix of voxel timeseries, and you...
Reducing dimensionality of features with PCA
If you use: [coeff,score] = pca(M); Comp_PCA1 = score(:,1); where M is a (300 by n) matrix of voxel timeseries, and you...
거의 9년 전 | 0
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Shortest Path in a 3D Matrix
If you do not really care too much about the 'uniqueness' issue brought up in the comments, and just want to consider a single "...
Shortest Path in a 3D Matrix
If you do not really care too much about the 'uniqueness' issue brought up in the comments, and just want to consider a single "...
거의 9년 전 | 1
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Current figure handle ignoring my open figure
most likely reason is that your figure has its _HandleVisibility_ property set to 'off' or 'callback' (so its handle is partiall...
Current figure handle ignoring my open figure
most likely reason is that your figure has its _HandleVisibility_ property set to 'off' or 'callback' (so its handle is partiall...
거의 9년 전 | 2
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how to achieve a smooth transition of a straight line trajectory into a semi circle trjaectory
Your problem definition is unclear, but I would probably try setting this as an optimization problem where you try to optimize s...
how to achieve a smooth transition of a straight line trajectory into a semi circle trjaectory
Your problem definition is unclear, but I would probably try setting this as an optimization problem where you try to optimize s...
거의 9년 전 | 1
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Can any one suggest me how to make a large matrics positive definate.
the matrix B defined as: B = (A+A')/2 + lambda*speye(size(A,1)); will have eigenvalues eig(B) equal to real(eig(A))+lambd...
Can any one suggest me how to make a large matrics positive definate.
the matrix B defined as: B = (A+A')/2 + lambda*speye(size(A,1)); will have eigenvalues eig(B) equal to real(eig(A))+lambd...
거의 9년 전 | 0
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Random Gaussian Surface Generation
You may use something like: N = [500 500]; % size in pixels of image F = 3; % frequency-filter width [X,Y] = nd...
Random Gaussian Surface Generation
You may use something like: N = [500 500]; % size in pixels of image F = 3; % frequency-filter width [X,Y] = nd...
거의 9년 전 | 2
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Why does the time scale for a ifft depend on the frequency interval of the frequency signal?
If you have a signal x with N samples acquired at a sampling rate Fs, then: 1) The time axis of your vector x (the time ass...
Why does the time scale for a ifft depend on the frequency interval of the frequency signal?
If you have a signal x with N samples acquired at a sampling rate Fs, then: 1) The time axis of your vector x (the time ass...
거의 9년 전 | 0
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Finding the "center integers" of an array
x = [1 2 3 10 11 12 15 16 17 20 21 22 23 24 30]; y = cellfun(@mean,mat2cell(x, 1, diff(find(diff([nan x nan])~=1))));
Finding the "center integers" of an array
x = [1 2 3 10 11 12 15 16 17 20 21 22 23 24 30]; y = cellfun(@mean,mat2cell(x, 1, diff(find(diff([nan x nan])~=1))));
거의 9년 전 | 0
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Finding the "center integers" of an array
x = [1 2 3 10 11 12 15 16 17 20 21 22 23 24 30]; y = x(floor(convn(find(diff([nan x nan])~=1),[1 1]/2,'valid')));
Finding the "center integers" of an array
x = [1 2 3 10 11 12 15 16 17 20 21 22 23 24 30]; y = x(floor(convn(find(diff([nan x nan])~=1),[1 1]/2,'valid')));
거의 9년 전 | 0
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Stop the execution of a function with a push button (GUIDE)
See <http://www.mathworks.com/matlabcentral/answers/142147-gui-push-button-problem this related question> Using drawnow withi...
Stop the execution of a function with a push button (GUIDE)
See <http://www.mathworks.com/matlabcentral/answers/142147-gui-push-button-problem this related question> Using drawnow withi...
거의 9년 전 | 3
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How to calculate a 2D rotation vector with PCA?
find the angle between the first column of PCA1 and the first column of PCA2 (hint: cos(angle(a,b))*norm(a)*norm(b)=a'*b) and bu...
How to calculate a 2D rotation vector with PCA?
find the angle between the first column of PCA1 and the first column of PCA2 (hint: cos(angle(a,b))*norm(a)*norm(b)=a'*b) and bu...
거의 9년 전 | 0
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Implementing a sine wave with linearly changing frequency
someone deleted his own answer including my own comments to it so, just in case these are interesting to anybody else, I am repe...
Implementing a sine wave with linearly changing frequency
someone deleted his own answer including my own comments to it so, just in case these are interesting to anybody else, I am repe...
거의 9년 전 | 3
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Implementing a sine wave with linearly changing frequency
the formula: sin( 2*pi*f(t)*t ) does not result in the desired sine wave with time-varying frequency. Rather the appropri...
Implementing a sine wave with linearly changing frequency
the formula: sin( 2*pi*f(t)*t ) does not result in the desired sine wave with time-varying frequency. Rather the appropri...
거의 9년 전 | 5
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How to run a repeated-measures t-test in Matlab to determine whether you can reject the null hypothesis.
use <http://www.mathworks.com/help/stats/ttest2.html ttest2> for a two-sample t-test (the two conditions are from two different ...
How to run a repeated-measures t-test in Matlab to determine whether you can reject the null hypothesis.
use <http://www.mathworks.com/help/stats/ttest2.html ttest2> for a two-sample t-test (the two conditions are from two different ...
거의 9년 전 | 1
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F-Test for difference between coefficients
help <http://www.mathworks.com/help/stats/generalizedlinearmodel.coeftest.html coefTest> and use a contrast H that compares t...
F-Test for difference between coefficients
help <http://www.mathworks.com/help/stats/generalizedlinearmodel.coeftest.html coefTest> and use a contrast H that compares t...
거의 9년 전 | 3
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How to get around out of memory issue
If your end-goal is to actually compute that entire 80000 x 80000 matrix, and you do not have enough memory to keep that matrix,...
How to get around out of memory issue
If your end-goal is to actually compute that entire 80000 x 80000 matrix, and you do not have enough memory to keep that matrix,...
거의 9년 전 | 0
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Keep GUI functions running when opening an uigetfile Dialog?
No, as far as I know uigetfile will create a modal window (see <http://www.mathworks.com/help/matlab/ref/figure-properties.html#...
Keep GUI functions running when opening an uigetfile Dialog?
No, as far as I know uigetfile will create a modal window (see <http://www.mathworks.com/help/matlab/ref/figure-properties.html#...
거의 9년 전 | 1
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Implementing Breadth first search using connectivity matriX
See <http://www.mathworks.com/help/matlab/ref/dmperm.html _help dmperm_> If I am interpreting correctly, something like the f...
Implementing Breadth first search using connectivity matriX
See <http://www.mathworks.com/help/matlab/ref/dmperm.html _help dmperm_> If I am interpreting correctly, something like the f...
거의 9년 전 | 0
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From inline to anonymous function
if you have the symbolic toolbox: g = matlabFunction(sprintf('[%s; %s]', dx1dt, dx2dt)); otherwise your best bet is proba...
From inline to anonymous function
if you have the symbolic toolbox: g = matlabFunction(sprintf('[%s; %s]', dx1dt, dx2dt)); otherwise your best bet is proba...
거의 9년 전 | 0
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Sum two cells and write to a third cell
Probaby a loop is going to be fastest, e.g.: for n=1:numel(A) A{n}(:,1)=B{n}(:,1)+C{n}(:,1); end but if you reall...
Sum two cells and write to a third cell
Probaby a loop is going to be fastest, e.g.: for n=1:numel(A) A{n}(:,1)=B{n}(:,1)+C{n}(:,1); end but if you reall...
거의 9년 전 | 2
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