# Catalytic

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**Content Feed**

Minimise memory requirements when importing many images

Why is it better to use NaNs instead of zeros? A value of 0 doesn't conflict with anything because all of your nontrivial values...

20 days ago | 0

How to code binary Fibonacci sequence?

"where the successive elements of the sequence are obtained as the concatenation of the two previous ones" No, see - https://e...

21 days ago | 0

| accepted

Question

A*1 and A+0 could be faster.

Regardless of the size of a matrix A, operations A*1 and A+0 should be very fast. A simple pre-check would detect if one of thes...

1 month ago | 1 answer | 1

### 1

answerHow to call a function with vector input in the fit type function?

SCR has to be a 1D function of the independent variable nu, meaning it has to give valid output when nu is a scalar. That is not...

2 months ago | 1

What is the recommended way to pass long list of parameters between main workspace and function?

Do not use load/save to introduce undeclared variables in your workspace. This can have unexpected effects as described in this ...

3 months ago | 0

Converting a system of coordinates

You cannot do a 3D coordinate conversion from a single 2D camera measurement. You need at least 2 cameras. If you have 2 cameras...

3 months ago | 0

How to find the index of the first absolute minimum entry of a matrix

A=[5,7,0.5,5 ; 2,1,4,1 ; 1,6,7,0.5], [value,index]=min(A(:)) [Iindex,Jindex]=ind2sub(size(A),index)

3 months ago | 0

How to take double integral of a function matrix?

syms x y a=1; b=1; t=1; E=100/72; v=0.2; x1=0; x2=b; x3=b; x4=0; y1=0; y2=0; y3=a; y4=a; B1 = [y-y4;0;x-x2]; B2 = [0;x-x2;...

3 months ago | 0

define nonlcon in fmincon

function [c, ceq] = mycon(x) ceq=[]; c(1) = -nonlinearfunction1 % Compute nonlinear inequalities at x. c(2) c(3) ...

3 months ago | 0

multi array vectorization problem (reformulated)

% init A = [ -0.8013 -0.4981; -0.2278 -0.9009]; t = 0:0.01:1e2; tic; % eigen space [V,D]=eig(A,'vector'); D = resh...

3 months ago | 1

Question

Since when has it been possible to dot-index the output of a class method?

Since when has it been possible to directly dot-index the output of a class method call, like this - classdef myClass p...

3 months ago | 1 answer | 1

### 1

answerHow to formulate the following matrices?

Why not just - T=zeros(3,3,n); for i=1:n T(:,:,i) = [cos(theta(i)) -sin(theta(i)) x(i) sin(th...

3 months ago | 3

Finding close-to-linear solution

Using fsolve inside of fsolve is a doubtful-sounding thing to do. Why not just combine the equations from solveE with the equati...

3 months ago | 1

Input multiple arrays into function

Simpler example, L2 = [0 1/2 1/3 0 0 0 0; 1/3 0 0 0 1/2 0 0; 1/3 1/2 0 1 0 0 0; 1/3 0 1/3 0 1/2 0 0; ...

3 months ago | 0

| accepted

Problem with ploting exp function

If I had to guess, you have x and y reversed. [X, Y] = ndgrid(x, y); surf(X, Y, t(X,Y));

3 months ago | 1

Multiple fminbnd errors with a parametrized function

Here is a symbolic method, if that's what you wanted. syms t f(t) f(t) = exp(cos(t)) - sin((3^(1/2)*sin(t))/3); vpasolve(di...

5 months ago | 0

how to read multiple column data from excel sheet as a particular variables and use them as input other formula calculations in multiple itrations

Look at readmatrix(), readvars(), readtable(), etc...

5 months ago | 0

Condensing code cannnot figure out easier function to use

threshold=30; %don't call this "max" blocklen=300; difference=rand(1,9268); N=numel(difference); Nc=ceil(N/blocklen)*blo...

5 months ago | 0

Question

How do I enable a user to link his Matlab license?

I have recently become a Matlab license administrator for my organization. I have a user who is trying to link his license to hi...

6 months ago | 0 answers | 1

### 0

answersHow can I set max & min value but maintain the curve trend?

yourSignal = rescale(yourSignal)

6 months ago | 0

| accepted

Bidirectional property and method definition with classes

If updatevalues is false, update properties normally (no links with other properties) <-- this means I cannot use the Dependent ...

6 months ago | 0

Plot line with points at given distance

This may help, https://www.mathworks.com/matlabcentral/fileexchange/34874-interparc

6 months ago | 1

Doing an example find the optimal state and optimal control based on minimizing the performance index, Fmincon error of scalar value

Do as the error message says. Test your cost function on its own and make sure it returns a scalar value before applying fmincon...

6 months ago | 0

3-d order derivative

If the points are too close together, the difference between neighbours will be so small as to be dominated by floating point er...

6 months ago | 1

Optimise a reference that cuts my curve into 2 equal sections

midline = trapz(x,y)/(max(x)-min(x))

6 months ago | 0

Solve an equation not getting a result

>> solve(increment1==((1/3)*(k/(1+evide0))*((x-s1(i-1))/x))+((1/3*G)*(x-s1(i-1))) ,x) ans = -2.6278e-06

6 months ago | 0

How to align the center of mass of two density functions?

xa=1:length(Na); xb=1:length(Nb); Nb=Nb + trapz(xa,Na.*xa) - trapz(xa,Na.*xa);

6 months ago | 0

How to assign character/string in the for loop

name={flist.name}; n=numel(name); S.(fname)=cell(n,1); for i=1:1 S.(fname){i}=load(flist(i).name; end

6 months ago | 0

| accepted

Close a specific area but do not close all the others

What if you convert the interior of the bubbles to foreground? load BW N=round(numel(BW)/10); BW=~BW; BW0=BW; BW=bwarea...

10 months ago | 0

| accepted