# Matt J

Professional Interests: medical image processing, optimization algorithms

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**Content Feed**

Is the 8th term maximum in the curve fitting toolbox and command line?

You will probably have to use a custom model, or else resort to lsqcurvefit().

5 hours ago | 0

How to limit variables in input function?

It does not make sense to have a tilde as an input argument in a function call. Perhaps you meant, tcfun3(1,P_min11 (j), T, 1)...

6 hours ago | 0

I want to compare each element in 2 matrix same size and display a text in every case.

A=[1 2 3 4 5]; B=[2 4 9 8 2 ]; t=["no", "yes"]; t((A<B)+1)

13 hours ago | 0

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Are recursively defined or nested anonymous functions dangerous?

I don't know about dangerous, but it is definitely inefficient and harder to debug. It will run much faster if you just implemen...

17 hours ago | 0

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Question

Save LiveScript as an MS Word document, but keep the equations editable

When I save a Live Script as a Word .docx file the equations are all converted to images, and therefore are not editable. Is th...

23 hours ago | 0 answers | 0

### 0

answersString array to matrix

Here's an example with comma separators instead of tabs, but it would work the same way. a=["1,2";"3,4"] c=arrayfun(@(z)st...

23 hours ago | 0

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Converting a system of coordinates

You need to measure the position of at least three non-colinear 3D points in both coordinate systems. Then, you can find the map...

3 days ago | 0

Extract sub array from d-dimensional array given indices for each dimension

If you have your vd_i in a cell array V={vd_1,vd_2,...,vd_d}, you can do A(V{:})

3 days ago | 0

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How to count numbers greater than a determined value

out = cumsum( histcounts(heights,0.5:0.1:100-eps(100)) ,'reverse');

3 days ago | 0

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Change initial step length in fmincon

You have some control over the step distance used for finite differencing operations (through FiniteDifferenceStepSize), and for...

3 days ago | 0

Meshgrid orthogonal to a line in 3D Space

You can also start with an unrotated grid, then rotate it: d=[1;1;1]; d=d(:).'/norm(d); [X,Y,Z]=meshgrid(-5:5); R=[d;null...

3 days ago | 0

Meshgrid orthogonal to a line in 3D Space

There are also ready-made File Exchange tools you can use, like this one d=[1;1;1]; %direction of line d=d(:)./norm(d); gtP...

3 days ago | 0

Meshgrid orthogonal to a line in 3D Space

Pick a 3D direction vector for the straight line, e.g. d=[1,1,1]; Then, d=d(:)./norm(d); B=null(d.'); %basis [x...

3 days ago | 0

how can i plot a continuous unit step function without heaviside?

Hint: t=linspace(-1,3,100); u=(t>1); plot(t,u); axis padded; xlabel t; ylabel u

3 days ago | 0

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Calculate mean value of every element of a .mat file

S = structfun( @mean, load('yourFile.mat'),'uni',0); matrix=cell2mat(struct2cell(S));

3 days ago | 0

program that performs 3D geometric transformations

imwarp will probably do most of the heavy-lifting for you. It's not clear to me what is meant by "More than one transformation s...

4 days ago | 0

How to avoid hessian being 0 in fminunc(maximum likelihood estimation)?

Operations in the objective function like this, min(.999999,normcdf(e_inside(t,i)) are technically illegal, since min(a,b) is ...

4 days ago | 0

Question

Automatic numbering and cross-referencing of sections in Live Script

I am investigating the possibility of having automatic section numbering and cross-references in Live Script. Here is an example...

4 days ago | 1 answer | 0

### 1

answerCombining two matrices with different sizes

M3=zeros(600,2,7); M3(230:598,:,:)=M2; M3(250:2:600,:,:)=M1; %replace M2 with M1 M3(1:2:end,:,:)=0;%odd numbers are zer...

4 days ago | 1

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Divide each column by the sum of the column in a matrix

D./sum(D)

4 days ago | 1

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How can i run this code? I get erros "Unable to perform assignment because the size of the left side is 1-by-600 and the size of the right side is 1-by-100."

for j=1:numel(H) for i= 1:numel(T) Tx = T(i); Hx = H(j); P(i,:,j) = fvdWEOSp(Tx,V,Hx); end ...

4 days ago | 0

multi array vectorization problem (reformulated)

runtest(1e2) function runtest(N) A = [ -0.8013 -0.4981; -0.2278 -0.9009]; t = 0:0.01:N; b = [2;3]; [V,d]=eig(A,'v...

4 days ago | 1

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Change the location of points in a 2D meshgrid

location=location+rand(size(location))*0.3+0.2;

5 days ago | 0

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How to formulate the following matrices?

T=makehgtform('translate',[x(i),y(i),0],'zrotate',theta(i)); T=T([1,2,4],[1,2,4])

5 days ago | 1

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bwlabeln 3D connections not a subset of its 2D connections

My guess is that the 4-connected regions are indeed subsets of the 26-connected regions, as you expect. However, in the 26-conne...

5 days ago | 1

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Imposing Constraint in FMINCON optimization problem.

x0 = zeros(1,N_plies); lb = [-ones(1,N_plies)*90 zeros(1,N_plies)]; ub = [ones(1,N_plies)*90 ones(1,N_plies)*t]; Aeq=zeros...

6 days ago | 1

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How to Multiply the following matrices case?

T=rand(3,3,18); D=rand(3,1,18); M=pagemtimes(T,D(:,:)); M(:,logical(eye(18)))=[]; M=reshape(M,3,17,18); whos M

6 days ago | 0

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How to create a matrix?

Do you mean this? [lat,long]=ndgrid(-89.75:89.75,0.25:359.75);

6 days ago | 0

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Merge rows based on conditions in the coulmns

T=varfun(@(x) [x(:)',nan(1,4-numel(x))],readtable('dmp.txt'),'Group',[9,1]); T=T(:,[2,4:10,1])

6 days ago | 0