# Catalytic

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**Content Feed**

How to find the span of a matrix in matlab?

Use orth and null, A = [-1 -5 -1 10 0 5; 1 5 0 -4 0 -5;2 10 -1 -2 -1 -7;-1 -5 2 -8 2 -1]; spanset=orth(A) rank([A,spanset])...

3 days ago | 0

How to use GPU to speed up computation?

Using the GPU in conjunction with parfor will not be productive unless you have a multi-GPU system and assign each parpool worke...

8 days ago | 2

Discretizing a column array, and performing operations on elements of another column array of the same length that lie in the same bins as the original one

I=findgroups(discretize(Z,edges)) ; S=sparse(I,(1:numel(I))', 1); S=S./sum(S,2); Fbinned = S*F;

8 days ago | 0

Uploading .mat files that contain nested structs into a datastore

I think the wisest course would be to reorganize your data and assign each "Unit" to its own separate .mat file.

13 days ago | 1

| accepted

Finding Transformation Matrix of a viewer3d object

Maybe you could use estimateCameraParameters using a list of hand-picked points.

13 days ago | 1

How to restructure my objective function to optimise using genetic algorithm?

Follow this example - https://www.mathworks.com/help/gads/ga-nonlinear-constraint-problem-based.html

15 days ago | 0

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Zeroing matrix elements outside of a certain range.

Zeroing the data will not exclude it from the average. You should use NaNs, data = [1;2;3;4;5].*ones(5,2).*[0.5,0.4] range =...

15 days ago | 0

Scattered Interpolant in matlab

No. There is no such thing as spline interpolation or extrapolation when you are dealing with scattered data. It is inherently a...

15 days ago | 1

How can the data be accurately clustered?

Maybe clusterdata would be useful. It has lots of different algorithmic options you could try.

15 days ago | 0

How do I add transparency to a plot in the Live Editor?

I find that this makes the lines dim in the Live Editor, like they appear in your post - plot([0, 1],[0, 1; 1, 0], 'Color', [1 ...

16 days ago | 0

Unable to find explicit solution in Lagrangian optimization

An analytical solution for 0<rho<1 is - A=[1 0; 0 1; -1 0; 0 -1]*E; [fval,i]=min(A*[p1;p2]); e1=A(i,1); e2=A(i...

22 days ago | 1

| accepted

error Unrecognized function or variable help me please :(!

signalsCell=load('signals').signals; PlotSignal(signalsCell, 3) function PlotSignal(signalsCell, n) Headings=signals...

23 days ago | 1

difficulties using fmincon codes

however it still uses @SomnathsFunc2 i would be happy to exclude rather than this cant we direclty add that part in code rather ...

27 days ago | 1

| accepted

Get equation of the surface from curve fitting

I would like to get a mathematical function that describes the surface of the 3D space, so I can, given a N and phi, get a value...

27 days ago | 0

Adoption of Name=Value in Function Calls what is best practice?

One situation where you have to stick with the old style anyway is when you want to pre-package your name value pairs in a cell ...

27 days ago | 0

Create a node in the space between two nodes (A and B) and following the direction normal to a node (N)

A = [-25.5530 -185.3199 -211.6502]; B = [-25.4769 -185.6468 -211.2523]; N = [-25.4602 -185.4676 -211.6694]; C=(...

28 days ago | 0

how to velocize it (avoid loop is possible)

I don't know if "velocize" (not a word) is supposed to mean "accelerate" or "vectorize". The two are not the same. If you're l...

1 month ago | 1

How to add cell array as index in plot title

I suspect that the code you've shown us is not the code that produces the error. I suspect you did this instead - figure tlo =...

1 month ago | 0

Which algorithm does SVD function take?

Comparing results showed that max difference in S and S1 reached 1e-14, but for U and U1 or for V and V1, max difference reached...

1 month ago | 2

For matrix A you cannot do: A.^2(:)

A=[1 2;3 4]; sum(A(:).^2) vecnorm(A(:))^2 norm(A,'fro')^2

1 month ago | 0

Identify the maximum values within fixed time intervals of a time series data set

Time=[4 5 6 7 8 9 10 25 26 27 28 29 46 47 48 49 50 58 59 60]; %Time vector, in minutes x=[ 0 5 0 1 3 11 2 0 0 1 8 3 0 0 -5 12 2...

1 month ago | 2

Create a 4D array from 3D array with 3 columns, and 1D (row only) array with 3 columns

So, could it be that myVar has 4 arrays inside it To me, it doesn't sound like you are talking about a 4D array at all, but ins...

2 months ago | 0

How to visualize histogram

You can use the histogram command with hold to superimpose them.

3 months ago | 0

shortestpath between two points on skeleton in binary image

You can use bwdistgeodesic.

3 months ago | 0

Why does abs cause bad matlabfunction evaluation?

The real problem appears to be that f is not fully simplified, and therefore the Symbolic Toolbox tries to naively apply the Cha...

3 months ago | 2

How to save .mat files on the disk after each iteration?

Often, you would put all images with the same label in the same folder - Folders={'Label1','Label2','Label3'}; for j=1:nu...

4 months ago | 1

Curve fitting a function that is dependent on a difference of 2d functions

There appears to be a simple analytical solution - constant=(0.0025)^(-5/3)*(2*Lambda^2*0.1816)/D^(1/3); DTV=(cX+cY)*consta...

4 months ago | 0

Calling functions that have a variable name

That sounds like a bad idea. You should probably make a single function where (n,k) are one of the arguments - function oneFun...

4 months ago | 3

Trapezoidal Rule of Convolution with Non-Uniform Intervals

I don't believe there is such a thing as the "Trapezoidal Rule of Convolution". Undoubtedly, you are thinking of the trapezoidal...

5 months ago | 0

| accepted

cut the object in space (separate a 3D object into two distinct parts) using a plane

The IsoCut command here looks like it will do this - https://www.mathworks.com/matlabcentral/fileexchange/87112-isocut

5 months ago | 0