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Alex Mcaulley


254 total contributions since 2019

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Answered
how to find size of scale bar on image
One approach would be: First, you need to segment the scale bar using any segmentation function, for example imbinarize (using ...

7 dagen ago | 0

Answered
Find the diameter of the parts in an image processing?
One approach would be: First, you need to segment the objects you want using any segmentation function, for example imbinarize,...

7 dagen ago | 0

Answered
How to select the columns of a matrix which are a multiple of 5?
N = M(3,5:5:end)

8 dagen ago | 0

Answered
Adding to the first value in a matrix based on the second value in that row.
Being A your matrix: A(A(:,2) == 11 | A(:,2) == 12,1) = A(A(:,2) == 11 | A(:,2) == 12,1) + 1

10 dagen ago | 0

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Answered
Creating an array from 1 to n
n = 10 % 1:n ans = 1 2 3 4 5 6 7 8 9 10

28 dagen ago | 1

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Answered
How can I create n arrays of size 100 each with random integer values?
c = cell(1,100) for i = 1:100 c{i} = randi(100,1,100) end

ongeveer een maand ago | 1

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Answered
Smoothing jumps when using unwrap()
You need to have a jump higher than pi to avoid the small jumps using unwrap (and this is not you case). Then, a trick you can d...

ongeveer een maand ago | 0

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Answered
How to separate a variable out of trigonomic expression
It is not a Matlab question, but you can do: cos(a+b)/sin(a+b) = 1/tg(a+b) = (1-tg(a)*tg(b))/(tg(a)+tg(b))

ongeveer een maand ago | 1

Answered
How to run a loop with different values and plot the result?
Yo can do it with an external loop with dt: for dt = 1:10 x=5; x_arr=[]; x_arr(1)=x; for i=1:10/dt ...

ongeveer een maand ago | 1

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Answered
Integration fo function A(c) from -inf to +inf
A = @(c) sqrt(m/(2*pi*k*T1))*exp(-m/(2*k*T1)*(c-c_bar1)^2) q = integral(A,-inf,inf)

3 maanden ago | 0

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Answered
how do I append to an array within a loop with float values?
Try with this: k = 0:0.1:20; solutions = zeros(size(k)); for ii = 1:numel(k) a = -k(ii); b = -k(ii); soln= ...

3 maanden ago | 0

Answered
Is it another command using to compare between vector and cell?
Then, to obtain the elements of U that doesn't exist in S, you can do: U = [1,2,3]; S = {1,2}; w = U(~ismember(U,cell2mat(S))...

3 maanden ago | 0

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Answered
How do I store the changing values of a variable (generated in a for loop) into a single file without overwriting the previous one?
n = 100; areatriangle = zeros(1,n) for ii = 1 : n areatriangle(ii) = .5*((ii/2)*ii); end or: areatriangle = .5/2*(1:n)...

3 maanden ago | 0

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Answered
How to find the position of points in a coordinate system?
Using for loops: R = zeros(numel(X),numel(Z)); for i = X for j = Z R(i,j) = sqrt(i.^2+j.^2); end end

3 maanden ago | 2

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Answered
position of values in a matrix
A = [23 24 35 2 12 19 24 23 12 15 26 17] loc = find(ismember(A,[35 2],'rows')) loc = 2

3 maanden ago | 1

Answered
How to put a value in a plot label?
depth = [5,10,15,20]; for k = 1:4 kd = 0.0143.*5*k; SOTE = (a + kd + kp).*X.^beta.*5*k; figure(1) if k < 3 ...

3 maanden ago | 0

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Answered
Why is this code not reading the csv file?
The images are useless, but the error is clear, your variable tdata doesn't exist. I guess you need to change this line: tdata ...

3 maanden ago | 0

Answered
ODE45, simple events
function [check,stop,direction]=landing(t,y) check = y; stop = 1; direction=0; end

3 maanden ago | 1

Answered
How to gracefully generate an all-one cell array?
function Output=OnesInCell(varargin) %This function should be the same as ones() except that each of the ones is packed into an...

3 maanden ago | 0

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Answered
How to cut dimensions of 3d arrays in a cell.
Being A your cell array: newA = arrayfun(@(i) A{i}(700:720,300:360,:),1:numel(A),'uni',0)

3 maanden ago | 1

Answered
selection of rows in a matrix
A = [36 13 9 21 23 32 35 5 3 43] B = A([1,3,5],:)

3 maanden ago | 0

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Answered
Cannot call files named with ' character in the text
filename = '8''_Data_Startup-1234567489'

3 maanden ago | 1

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Answered
Exporting data from matlab to a excel with a special pathway
xlswrite(filename,Y1,1) xlswrite(filename,Y2,2) xlswrite(filename,Y3,3)

4 maanden ago | 0

Answered
How do I code a function that's supposed to be an infinite pattern?
Another possibility: res = sum(x.*circshift(y,-1) - y.*circshift(x,-1))

4 maanden ago | 0

Answered
Best way to calculate the determinants of a series of matrices?
delta = arrayfun(@(t) det(squeeze(G(t,:,:))),1:size(G,1));

4 maanden ago | 0

Answered
what is the error in this program
There is no error in your code, the problem is that it doesn't do whatt you want. I guess you want something like this (without ...

4 maanden ago | 0

Answered
Errror using imwrite, can't use "append" in 'WriteMode'
You are changing the file name for each frame, resulting in different tif images. To build a tif stack you just need to use ONE ...

4 maanden ago | 1

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Answered
How to generate a random integer between two bounds?
randi([4,500])

5 maanden ago | 0

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Answered
i want to plot 4 plots using ginput
Adding hold on: clear all; close all; hold on for k=1:4 axis([0,10,0,10]); data = ginput(4); x = data(:,1); y = data(:,2...

5 maanden ago | 0

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Answered
Summing up values of A matrix if it matches the same value in B
One option: [G,ID] = findgroups(B); C = [splitapply(@sum,A,G),ID] C = 15.0000 32.1111 3.0000 34.6731 1.0000...

5 maanden ago | 0

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