How to pass a vector to a function that creates matrix
>> b=[1 2 3]*10; >> T=@(i) [b(i)+9 , 8 ; 8 , 7 ]; >> T(3) ans = 39 8 8 7

9 Tage ago | 0

how to calculate direction in rotated coordinate system

10 Tage ago | 0

How to work with Nelder-Mead algorithm with 7 unknown variables?
You can use fminsearch (an implementation of Nelder-Mead) with any number of variables. However, there is no way to gaurantee th...

10 Tage ago | 2

f(x)=sin(x)-x^5=0 providing x is not equals 0 ,function in the interval x [0,3]
>> [x0,fval]=fzero(@(x)sin(x)-x.^5,[0.8,1]) x0 = 0.9610 fval = -1.1102e-16

10 Tage ago | 0

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Generating Toeplitz Matrix which Matches the Convolution Shape Same
Using interpMatrix (Download), nH=numel(vH); nX=numel(vX); ic=ceil( (nH+1)/2); mH = interpMatrix(vH,ic , nX,1);

10 Tage ago | 0

Generating Toeplitz Matrix which Matches the Convolution Shape Same
I am specifically asking about using the function toeplitz(). If it must be with toeplitz, then: nH=numel(vH); nX=numel(vX); ...

10 Tage ago | 0

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Concatenating matrices in a file into another matrix
For example, >> p1=[1,2,3]; p2=[4 5 6]; p3=[7 8 9]; save p p1 p2 p3 >> A=cell2mat(struct2cell(load('p'))) A = 1 ...

10 Tage ago | 0

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Warning: Matrix is close to singular or badly scaled. Results may be inaccurate. RCOND = 2.240406e-24.
Even with A\B, you cannot expect reliable behavior with RCOND as small as 2.240406e-24. For all intents and purposes, your mat...

10 Tage ago | 0

Fit a conic section without mirror image hyperbola
This approach uses John's fminspleas FEX submission (Download). Although the fit is, technically, a hyperbola, it diverges to a ...

10 Tage ago | 1

rotating and saving images to folder: error during loop
The code works fine for me. If I had to guess, I would say it is because you ran the code previously while debugging and never c...

10 Tage ago | 0

Defining constraints in the Quadratic Programming
If you have a quadratic function of only 1 unknown variable, it should be possible to find the minimum analytically - no iterati...

10 Tage ago | 0

The code looks suspiciously like an attempt at weighted normalized cross-correlation. If so, see here for a possibly faster alte...

11 Tage ago | 1

Forming a block diagonal matrix of one certain matrix?
using interpMatrix (Download) S=1*ones(2); B=2*ones(2); C=3*ones(2); copies=4; %number of repetitions L=flip( {S,B,C, z...

11 Tage ago | 0

Generating Toeplitz Matrix which Matches the Convolution Shape Same

11 Tage ago | 0

Fast method to find average pairwise distance of a very large matrix?
I don't know about the mean distance, but the mean squared or root mean squared distance is pretty easy. Compare: A=rand(330000...

14 Tage ago | 0

Creating a Random Upper Triangular Matrix with Unique Entries for Efficiently Computing Matrix Exponential.
Just use randi, e.g., >> k=8; M = triu(randi(10,k,k)) M = 9 10 5 7 3 5 8 10 0 10 ...

14 Tage ago | 0

How can I extrapolate the value for the slope of the line?
You could do, p=polyfit(log(x),log(y),1); slope=p(1);

14 Tage ago | 0

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How to store sequence of bits as a bit stream and use the least possible memory ?
You could chain all your strings together as a logical column vector and use bwpack, see https://www.mathworks.com/help/images/...

14 Tage ago | 0

calculate rotation matrix in 3D
B1=[axis_1/norm(axis_1);axis_2/norm(axis_2);axis_3/norm(axis_3)]; B2=[dir1_new(:),null(dir1_new)]; s=sign(det(B2)); B2=...

14 Tage ago | 0

How to I convert a 3D array into 4-column table (x y z value)?
[m,n,p]=size(imgData); [x,y,z]=ndgrid(1:m,1:n,1:p); out=[x(:),y(:),z(:),imgData(:)];

15 Tage ago | 0

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Correct Interpolation on a pre-calculated grid that is a vector function of a vector?
so that I can query at points (Gx_q, Gy_q, Gz_q) and find their (x,y,z) inputs that give G. But there may exist no such point ...

15 Tage ago | 0

interp1 gpuArray bug
The bug appears to have been fixed in R2019b: >> A=rand(80,2); >> interp1((1:80)', A, gpuArray(((1:2))')) ans = 0.60...

15 Tage ago | 0

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Solve equationsystem (A*V).'*B*(A*V)=C for matrix A
for a first solution we could assume A is diagonal. An iterative solution: fun=@(a) objective(a,B,C,V); a=lsqnonlin(fun, on...

16 Tage ago | 0

Solve equationsystem (A*V).'*B*(A*V)=C for matrix A
Looks like it would just be, A = sqrtm(B)\sqrtm(C)/V;

16 Tage ago | 0

How to define coordinates of orientated BoundingBox for every case?
How about if you find the centroid (ic,jc) of each region and then identify the bounding box corner (i,j) satisfying the conditi...

16 Tage ago | 0

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How to perform multi-planar reformation in CT/MR images?
There is the slice() command. https://www.mathworks.com/help/matlab/ref/slice.html

16 Tage ago | 0

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Is there any way I can feed forward a 3D dataset into a neural network?
You could train the network to view the input as 20x65 with N=1658 channels, but it would probably be more practical to break th...

17 Tage ago | 0

Linearprogramming conditions are unknown
As I mentioned in your previous post, you want to set up the following equivalent LP, I don't think it should be a diff...

18 Tage ago | 0

plot 3-D distribution from a 3-D matrix
As of R2017a, Matlab provides a 3D volume viewer app, https://www.mathworks.com/help/images/ref/volumeviewer-app.html

18 Tage ago | 0

What capability would you want to see added to the symbolic toolbox in the future?
The ability to manipulate symbolic matrix variables (instead of just matrices of scalar symbolic variables).

19 Tage ago | 1