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Alex Mcaulley


245 total contributions since 2019

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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)

18 días 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= ...

19 días 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))...

19 días 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)...

19 días 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

20 días 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

20 días 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 ...

20 días 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 ...

20 días ago | 0

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

20 días 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...

20 días 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)

21 días 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],:)

25 días ago | 0

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

alrededor de 1 mes 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)

2 meses 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))

2 meses 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));

2 meses 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 ...

2 meses 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 ...

2 meses ago | 1

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

3 meses 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...

3 meses 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...

3 meses ago | 0

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Answered
Problem in plotting the string variable
Do you mean this? Rough_y=[4;5;8;3;12;14;9;11;17;17;11;14;19;25;15] Station=['a';'b';'c';'d';'e';'f';'g';'h';'i';'j';'k';'l';'...

3 meses ago | 0

Answered
How can i use Inverse for symbolic variables?
syms x y a b c d A = [ a*(x^2) , b*(y^3) ; d*(x^2)*y , c ]; inv(A) ans = [ c/(- b*d*x^2*y^4 + a*c*x^2), -(b*y^3)/(- b*d*x^...

3 meses ago | 1

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Answered
problem with reading data from excel
Do you mean this? data = xlsread('yourExcel.xlsx'); data = data(2:end,2:end) data(2,4) %For example: x1 = 2; x2 = 4

3 meses ago | 0

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Answered
Checking for existence of row in a matrix
Try with this: my_mat = [1 2 4 5 3 1 6 9 7]; new = [6 9]; Lia = ismember(my_mat(:,1:2),new,'rows'); ...

3 meses ago | 0

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Answered
How to repeat loop until condition is met? While or For Loop?
Something like this would be a good solution: x = %Initialization A = x + 1.5; B = x^2 + 1; Error = A-B; iter = 1; while ...

3 meses ago | 0

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Answered
Differentiating gives wrong result
I don't know why the result is presented in different way depending on the case, but the result is allways the same: %Case 1 s...

3 meses ago | 0

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Answered
Array indices must be positive integers or logical values
You are trying to acces to: B(0), B(0.1) and so on, which are not allowed indexes. Try with this: %% MAGNETORQUER SIZING clear...

3 meses ago | 0

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Solved


Back and Forth Rows
Given a number n, create an n-by-n matrix in which the integers from 1 to n^2 wind back and forth along the rows as shown in the...

3 meses ago

Solved


Is my wife right?
Regardless of input, output the string 'yes'.

3 meses ago

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