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How do I find the coordinates inside a rectangle or triangle?
INTERP2

7年以上前 | 0

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select numbers based on different probabiltiies
select = rand < 1e-6

7年以上前 | 1

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How i Calculate the average number of even numbers in an array?
a = [1.3700 1.2200 2.2000 2.2800]; ac = round(a*100); mean(ac(mod(ac,2)==0))/100 result ans = 1.9000

7年以上前 | 0

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what is non-local total variation regularizarition (NLTV)?
That means the regularization of the image I(x,y) is of the form integral of lambda(x,y) | grad I (x,y) | dx*dy. lambda(x,y) i...

7年以上前 | 0

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Using the cubic spline code below, I need to extract the value found for x = 3.5. How do I call this value?
Run this after your code >> tempx = 3.5 tempx = 3.5000 >> [~,i] = histc(tempx,x); >> a(i) + b(i)*(tempx-x(i))+c(...

7年以上前 | 0

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Which mldivide ('\') function is better
Use pseudo inverse PINV to get more stable solution. Never use "\" on nearly singular matrix. You are happy with 2008 is just pu...

7年以上前 | 0

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Is "ismultithreaded" function exist?
Not that I'm aware of, in any case they will give out such information since they (TMW) have a habit to consider speed optimizat...

7年以上前 | 0

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FFT seems to be not calculating Nyquist component?
Change A*sin(2*pi*Fs/2*t) to A*cos(2*pi*Fs/2*t) Or alternativey you must put cos expression in the imaginary part of your...

7年以上前 | 1

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Structure array slower than loose variables
Yes acessing field names is slow., so try to avoid doing it intensively.

7年以上前 | 1

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How to solve a complex-valued equation
So your equation is of the form a / (g - x)^2 = k* x Just multiply by (g - x)^2 in both sides, you'll get a = (g - x)^2 * k* ...

7年以上前 | 1

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For Loop to concatenate Matrix Product
A_All = []; A_0toAll = []; C_i = 1; for i=1:5 T_i = [i+2 i+3 i+4 i+5; i+3 i+4 i+5 i+6; i+4 i+...

7年以上前 | 0

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Force slope and return intercept value (assuming a non-zero intercept)
m = WhatYouWantItToBe k = mean(log10(y)-m*log10(x))

7年以上前 | 1

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get vector from a matrix ith row or column based on given dimension
c = repmat({':'},1,ndims(A)); c{dim}=i; A(c{:})

7年以上前 | 2

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Finding PDF for difference of two PDFs
For 2 dependent variables A and B, the pdf of A+B is pdf(A+B) = pdf(A) * pdf(B) where "*" is a continuous convolution operator...

7年以上前 | 0

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Specified number of ones in the matrix (column and row)
From an idea by Akira Agata n = 10; % Matrix dimension k = 4; % row/column sum target of 1s r = [ones(1,k) zeros(1,n-k)]; ...

7年以上前 | 2

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Using a vector as an index to a matrix
[m,n,p] = size(A); [I,J] = ndgrid(1:m,1:n); C = A(sub2ind([m,n,p],I,J,b(I)))

7年以上前 | 0

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Low Level Graphics Error
After crash you migh run opengl hardware opengl('save','hardware') to restore value. I systematically have opengl crash whe...

7年以上前 | 0

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Finding rows of matrix A that do not overlap with any rows in Matrix B (without using for or while loop)
Assuming A and B are column-sorted for all rows A= [ 0 50; 200 250; 300 350; 400 450]; B=[50 200; 200 300; 300 400]; BB=res...

7年以上前 | 0

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Need help with solving system of ODEs in Matlab
y=zeros(m, N+1); % numerical approx. vector I think it should be y=zeros(N+1,m); % numerical approx. vector Those things ...

7年以上前 | 0

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preallocate array without initializing
MEX can do that, use for example this utility

7年以上前 | 1

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How to change matrix numbers positions
X(randperm(numel(X))) = X

7年以上前 | 0

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Difference between the individual rows of B and all the rows of A.
DIF = zeros(size(A,1),size(B,1)) for k=1:size(B,1) DIF(:,k)=sqrt((A(:,1)-B(k,1)).^2+(A(:,2)-B(k,2)).^2+(A(:,3)-B(k,3)).^2)...

7年以上前 | 1

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Project 3D points onto a 2D plane with least overlap
Assuming your data points is store in (n x 3) array xyz xyzc = mean(xyz,1); [~,~,V] = svd(xyz - xyzc,0); xy2d = xyz*V(:,1:2);...

7年以上前 | 1

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Finding PDF for difference of two PDFs
Not sure if it helps but the green area is { (x:y) : 0 <= y <= min(p1(x),p2(x)) }

7年以上前 | 0

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randsample([0 1],1,true,[1 - p p]) ..... with p as a vector?
Assuming yoy have p in a vector r = rand(size(p))<p

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How can I efficiently (with no loops) compute the mean of each column in a matrix, taking different elements from each column?
M = [ 1 2 3 4 5; ... 6 7 8 9 10; ... 11 12 13 14 15]; idx = [ 1 2 3 2 1; ... 2 3 3 3 3]; m = si...

7年以上前 | 1

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7年以上前 | 0

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Generate all possible combinations
A = [1;2] B = [3;4] C = [5;6] D = [7;8] L = {A,B,C,D}; n = length(L); [L{:}] = ndgrid(L{end:-1:1}); L = cat(n+1,L{:}); ...

7年以上前 | 2

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Generate All Possible combinations
A = [2;4;6] B = [1;3;5] [AA,BB] = meshgrid(A,B); C = [AA(:),BB(:)] ans = 2 1 2 3 2 5 ...

7年以上前 | 0

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How can I compute all the possible differences of the vectors in a matrix?
>> A = [1,2,3; 4,0,1; 2,3,5; 6,0,1]; >> r2 = nchoosek(1:size(A,1),2) r2 = 1 2 1...

7年以上前 | 0