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Catalytic


Last seen: 26 days ago |  Active since 2019

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Answered
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...

1 month ago | 0

Answered
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...

1 month ago | 0

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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...

2 months ago | 1 answer | 1

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answer

Answered
How 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...

3 months ago | 1

Answered
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

Answered
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

Answered
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

Answered
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

Answered
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

Answered
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

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answer

Answered
How 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

Answered
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

Answered
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; ...

4 months ago | 0

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Answered
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));

4 months ago | 1

Answered
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

Answered
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

Answered
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

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answers

Answered
How can I set max & min value but maintain the curve trend?
yourSignal = rescale(yourSignal)

6 months ago | 0

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Answered
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

Answered
Plot line with points at given distance
This may help, https://www.mathworks.com/matlabcentral/fileexchange/34874-interparc

6 months ago | 1

Answered
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

Answered
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

Answered
Optimise a reference that cuts my curve into 2 equal sections
midline = trapz(x,y)/(max(x)-min(x))

6 months ago | 0

Answered
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

Answered
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

Answered
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

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Answered
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

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Answered
How to display -180 to 180 in a loop
mod(180:5:360+180,360)

10 months ago | 0

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