Question


Release note of the update?
Is there a release note for the update in general, for Update2 R2018B in particular? Just wonder since the update 2 of R2018B a...

plus de 7 ans il y a | 1 réponse | 0

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Optimize the Max Min over two sets for the given function
For ant row a_j, the inner equation argmin_lambda || sum (lambda_i * b_i - a_j) ||^2 lambda >= 0 sum(lambda_i) = 1 can be s...

plus de 7 ans il y a | 0

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How to efficiently compare two matrix to get a single reference value?
TrueVal= [1 1 1 2 2 2 3 3 3 1 2]'; Predicted=[1 2 3 1 2 3 1 2 3 3 2]'; [ut,~,it] = unique(TrueVal); [up,~,ip] = unique(Pre...

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Flipping a plot by 180 degrees
[x,y]=find(peaks>0.7) close all subplot(2,1,1); plot(x,y,'or') subplot(2,1,2); plot(x,y,'or'); % This command will r...

plus de 7 ans il y a | 1

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gauss elimination or inverse
P = polyfit(x(:),y(:),n-1); a = P(1); b = P(2); ... c = P(n);

plus de 7 ans il y a | 1

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Error using:mtimesx_build.m
If you run recent MATLAB you also must change the line #166 of mtimex_build.m to mexopts = [prefdir '\mex_C_win64.xml'];

plus de 7 ans il y a | 0

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How to create a random binary matrix with equal number of ones in each column and equal number of 1 in each row ?
See the same question here

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replacing for loop with more efficient code
% Generate test matrices m = 5; n = 10; S = rand(n,n); S = 0.5*(S + S.'); X = rand(n,n); X = 0.5*(X + X.'); A = zeros(n...

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Generate N random uniformly distributed points in the d-ball
d = 3 n = 10000; % s is (d x n), n points in unit d-ball s = randn(d,n); r = rand(1,n).^(1/d); c = r./sqrt(sum(s.^2,1)); ...

plus de 7 ans il y a | 0

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Difference between angle2dcm and eul2rotm (same angle sequence, different result)
I check and the eul2rotm command returns the rotation matrix according to Wikipedia definition of euler z-y'-x" intrinsic to rot...

plus de 7 ans il y a | 1

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Average the 3rd dimension in a matrix
Mean every 4 indices of the third dimension A=rand(360,181,360); [m,n,p] = size(A); m = mean(permute(reshape(A,m,n,4,[]),[1 ...

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Remove rows with consecutive numbers
A = [1 2 3 4 5; 3 5 7 9 11; 1 1 4 5 7; 3 5 6 6 9; ...

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How to find curvature(k) of plane curve have having using it's position points (x & y) equally spaced with arc length s.
Big Curvature -> red Small Curvature -> blue % Dummy test data t = 1:7; x = rand(size(t)); y = rand(size(t)); fx = spl...

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Is there a way to start indexing with 0 in MATLAB?
Yes, but you won't get much support by built-in array stock function >> M = containers.Map('KeyType','uint32','ValueType','dou...

plus de 7 ans il y a | 3

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Rotational symmetries of cubic crystal structures
xcord=[0 1 0 0 1 1 0 1]; ycord=[0 0 1 0 1 0 1 1]; zcord=[0 0 0 1 0 1 1 1]; xyz = [xcord; ycord; zcord]; theta = pi/3; M =...

plus de 7 ans il y a | 1

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how to find maximum distance of convex polygon for each point in a convex hull?
This is a method that provides the maximum distance that has better complexity than computing distance of all pairs as other ans...

plus de 7 ans il y a | 0

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Rotate a Matrix by Finding an Axis
Here is the code to find the largest distance between 2 white pixels. Once finding it you can compute the angle and rotate the ...

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Optimize the Max Min over two sets for the given function
Not sure why this bla-bla about convex that makes your statement confusing. There is no continuous variable in the quantity f2 =...

plus de 7 ans il y a | 0

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Solve for diagonal matrix D by minimizing the operator norm in Matlab
fminunc, fmincon and family.

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Creating an image of first non-zero values in a 3d matrix
[maxval,firstNonZero] = max(im_datacube ~= 0, [], 3); firstNonZero(~maxval) = NaN; % pixel where 1 is not found along the 3rd d...

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Determine eigvector through eigvalue without using eig
null(A - lambda * eye(size(A))

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How to count the number of consecutive identical element of each row in a binary matrix?
A = [0 0 0 0 1 1 0 0; 1 0 1 1 1 1 0 0; 0 1 1 0 1 0 0 1] m = size(A,1); B = A'; b = [true(1,m); diff(B)~=0]; ...

plus de 7 ans il y a | 2

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Matlab 2014b bug: Warning: Matrix is singular to working precision.
The problem is this "Warning: Matrix is singular to working precision." That means you matrix inversion is unstable, illposed,...

plus de 7 ans il y a | 1

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Calculate volume from an isosurface
If your iso surface is get from isosurface() command then your volume is set of voxels V <= isovalue or V >= isovalue So ...

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fast interp on 1 dimension of 3d matrix
[m,n,p] = size(A); B = reshape(A,[m*n p]).'; Br = resample(B,2,1); % 2 is upsampling factor Ar = reshape(Br.',m,n,[]);

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Can pareto optimality be used to solve the travelling salesman problem?
Just change the definition "distance" between 2 cities to, for example d = sqrt((1/dx)^2 + dy^2) and feet it TSP algo. Note...

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how to get polynomial fit for the set of data points????
You might fit parametric, so it meets yours question since it's polynomial. xy=xlsread('E:\MATLAB\data points.xlsx',1) x=xy(:,...

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how to fit segmental regession with matlab
Look like this recent thread also answers your question

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Gauss Curve Point of Inflection
If you know the curve is Gaussian, the inflection points can be computed directly from curve parameters. For Gaussian curve cent...

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Can anyone solve this? Find the shortest distance between the plane 3*x1+4*x2+x3=1 and the point (-1,1,1). (optimization problem?)
n = [3;4;1]; d = abs((n'*[-1;1;1]-1)/sqrt(n'*n)) gives: d = 0.1961

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